simple catamaran design

Time For a Catamaran Adventure

Isn't Time For Yours?

Building Your Own Catamaran

Building your own catamaran is another option to getting into your own boat. In this page we will go over the advantages, considerations, and a detailed history and journal of our boat-building adventure with Light Wave . We hope this will give you a clear picture of what lies ahead if you go this route, including:

• Construction methods
• 9 essential design features
• Review of the four leading catamaran designers for home builders
• Construction times
• Budget: How much did it cost to build a basic cruising catamaran?
• Layout of our catamaran, LightWave , and lots of pictures
• Carllie’s article from September 2000 Multihulls Magazine: “The Boat Builder’s Wife “
• Equipment outfitting
• Radio and communication outfitting
• Dinghy selection and considerations
• Having a boat custom-built for you

Because of the huge dollars needed to buy a new or even a used catamaran, we would never have gotten a catamaran if we hadn’t built it ourselves.

Let’s start by saying that building any type of larger boat, especially a catamaran, can be one of the most intellectually and physically challenging things you will ever do.

It has been said that building a large boat is the closest a man can come to giving birth to a baby. In other words there is going to some discomfort and pain along the way; you will question yourself on whether this was such a good idea; it’s very difficult to reverse the decision; and though friends will support you, you will be on your own most of the time with your significant other if he/she is game.

Know your boat

You will intimately know every part of your boat. You will know where every wire, hose, bolt, bulkhead, rib, and support is because you installed them!

Pride of ownership

We have often thought what it would be like to just buy a boat from a manufacturer, and know that while owners who have spent a lot of cash (or future life to pay off the lien) their often possessive and competing-with-the Joneses could not begin to compare to our quiet glow of happiness and akinship we feel with Light Wave .

Our boat is like part of the family. So much time was spent on her that we have a major emotional investment. Every time we see our vessel – from a distance at anchor or approaching her in our marina, we say, “What a pretty boat! I can’t believe we built it!” Then that sense of accomplishment settles back in and we feel we have indeed earned the privilege of all of the beautiful experiences we have had sailing, cruising, exploring the beautiful BC Coast and much further a field (or should we say “an ocean”?).

You will be able to pay for the materials as you go and “donate” your time to the cause.

Get a newer design

Many of the production boats that are out there are designs of many years ago because the manufactures have to recoup their capital investment on the mold and production setup. When you build your own you have much newer designs to draw from.

Details on Our Boat Building Adventure

We had sailed our first boat Wave Dancer for five years and had many adventures on the British Columbia coast. In May 1996, I had just returned from a little one-week solo trip in the Gulf Islands of BC when I bought the book, The Cruising Multihull by Chris White (Future link to book review on our web site).

This is the book that got me going (Carllie was not yet convinced). I must have read it a half dozen times over the next 6 months, each time becoming more convinced that this was the way to go for our next boat. It was really still pre-internet web site days so I wrote to all the designers that were listed in the back of the book. Over the next several weeks packages of information started appearing in the mailbox (there is just something about getting packages in the mail – I guess it’s the anticipation). I would pour over these preliminary printed pages with pictures and accommodation layouts. Next, I put a few dollars down to buy the information packages and study plans from the top prospects.

I waited patiently for the study plans. It was like the night before Christmas when I was kid. Oooh the wait! Finally they came, and again I carefully scrutinized the next level of detail. Things were getting a little more serious. The top contenders were:

• Richard Woods
• Chris White
• James Wharram

Click here to read my comments and reviews on their catamaran designs as well as those of Jeff Schionning.

I remember initially drooling over the Atlantic 42 by Chris White, still one of my favorite designs. It seemed to be so seaworthy (by the way if I run into about $800,000 USD any time soon, I am going to buy an Atlantic 55). The most important piece of advice that came out of the material was from Richard Woods:

“Build the smallest boat you‘d be happy with it.”

Axiom #1: The hours to build a catamaran is in almost in direct proportion to its weight.

Which brings us to Axiom #2:

Axiom #2: It takes about 1 hour to create 1 pound of finished boat.

In our case we spent 3,500 hours ( click here for full details on the construction hours ) to build a 4,000 lb. boat (just a little less than 0.9 hours per pound). If a boat’s empty weight is 8,000 lbs., it will probably take about 6,000 hours to build.

When you think about it, you can only mix and handle so much material per hour. More boat weight, more material, more hours. Sure there are some economies of scale on a bigger boat, but usually the systems become more complex and these take longer to install.

This decision process took 8 months and I figured we’d launch in 6 months. It was now January of 1997. Little did we know it would be 26 months and 3,500 hours between the two of us until we launched on June 5, 1999. We ordered the full plans and we were off and running.

We were ready to build, but where would we start the process? First of all, we live in a tiny 480 sq. ft. apartment in Vancouver. Back-yard building wasn’t exactly an option so I found a small garage nearby that we rented for 5 months.

After about 4 months in the garage, I had made all the small parts and it was time to build the hulls. This meant that we had to go larger facilities. We found space at Shelter Island Marina and Boatyard in Richmond. This is the biggest boat yard in the Vancouver area with dozens of commercial and private projects, big and small, under way.

We were out of money by then, so we sold our first boat so we could buy resin and fiberglass. It was a traumatic time as we said goodbye to our beloved Wave Dancer . We were now committed. We than had all the foam for the hull cores, barrels of resin, and huge rolls of matting and roving needed for the fiberglass skins delivered to our “domed stadium”. We kicked ourselves many times that we didn’t take a picture of this raw material stacked in one corner of the empty shed, so we could later show “before” and “after” photos. It was time to build the hulls.

Over the next several months we proceed to join the hulls with the beams I had built in the garage, and then to install the cuddy cabin, cockpit, and decks. By the spring of 1998, it was staring to look like a catamaran. Through the spring and summer of 1998, we continued with the major structural components: mini-keels, hatches, stairs, and interior. Then we went on to the very laborious work of fairing the boat before painting. Don’t under estimate that job!

By October 1998 we were ready to prime the boat and start painting. I really thought this would go quickly. I forgot that I would have to do two more complete sandings to sand off and finish the two layers of primer application. In addition we had to fill countless pinholes – a laborious process somewhat like hiking up a mountain – each time you get to what you think is the top, you see another summit!

The boat seemed to get bigger and bigger. Believe me, there is a lot of surface area on a catamaran. I clearly remember that last sanding: I had reached the end of my physical and mental endurance – I was exhausted. I was ready to move on to the next phase – any phase but more sanding!

We now started spray-painting the hulls bright yellow. It was around this time we decided on our boat name of Light Wave . The painting took over a month: the hulls being the easy part, it was the topsides, the nonskid, and all the masking and prep that seemed to take forever. Happily, the worst of the dust was gone.

By March 1999 we were in the home stretch. The center bridge deck cabin was completed so we took a week off from our paid jobs and lived on the boat in the shed so we could work all day and not waste time commuting. March, April and May were frantic months as we finished all the final touches: engine installation, rudders, windows, deck fittings, electrical, plumbing, mast, and rigging. See our outfitting page (for more details on what we picked and why, and things we would do differently now.

Initially, our electronic systems were relatively basic but included GPS and autopilot see the following link for all our electronic outfitting choices and reasoning for more details.

It was May 22, 1999 and we decided that Saturday, June 5th would be “Launch Day” so we could send invitations to all of our friends. On the Friday night before Launch Day, we still had a number of final things to do, many of them outside. Unfortunately it was pouring rain. We were tired and very wet but the boat had to go into the water next day so we persevered on till everything was ready.

The moment of truth came as Light Wave was lowered into the water. While still in the slings of the Travelift, I jumped aboard to check for leaks. Of course there weren’t any! More food and laughs and tours of the boat for all attending. It was a great day.

Emotionally drained that night, we slept in Light Wave in the water for the first time. It was another week before we actually went out for our first trip as we had to sell the shed, setup sails, and install some final deck hardware.

To sum it up, building a catamaran was a great experience. We learned a lot. Carllie and I grew closer together through it all. We had a great time doing it. We had a beautiful catamaran to show for it. Now it was time for a catamaran adventure !

How To Create the Perfect Cruising Catamaran Layout

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More than ever before, sailing fans are gaining an interest in catamaran layouts and designs that define performance. Many others are also looking into either buying a cruising catamaran or designing and building one. While building a catamaran is no piece of cake, this article shows you how to create the perfect cruising catamaran layout. 

To create the perfect catamaran layout, carefully consider factors like a good hull design, optimal helm station placement, boat stability, and adequate load-carrying capacity. Excellent galley positioning, ease of handling, and spacious living and sleeping quarters are also crucial. 

The modern cruising catamaran is a far cry from the simple Polynesian double canoe of old. That’s because structural innovations and new composite materials have resulted in multihulls with impressive cruising abilities. Keep reading to learn more about exceptional catamaran layouts.  

The Changing Trends in Catamaran Designs

The early cruising catamaran designs resulted in boats that could sail much faster than traditional sailing boats. In addition, they could glide with ease in shallow waters and required less wind and crew. Unfortunately, these cruising cats were heavy, had small, cramped interiors, and boasted somewhat challenging handling abilities. 

Today’s cruising catamarans are different. They boast the utmost comfort, high speeds, and the safety of a well-designed cruising yacht. They are also more exciting, visually appealing, deliver the smoothest of rides, and sport more spacious interiors. 

Have a look at the below video showcasing the top ten cruising catamarans:

Features To Look Out for in Catamaran Design Layouts

Cruising catamaran designers understand what most sailors look for in a cruising vessel. They, therefore, design cruising multihulls that address these pertinent issues and more. Some of the features you might want to consider having in your dream boat include the following:

• Responsive performance. Outstanding performance allows for pleasurable cruising and ensures your safety since you have more options during difficult weather.
• Excellent load-carrying ability . This allows you to have an extended cruising vacation or ocean crossing.
• Boat stability . Go for lightweight, robust construction, which results in a lot of buoyancy.
• A low center of gravity for smooth rides and enhanced performance. Centering weight around a low center of gravity improves the overall sailing quality, reduces pitching movement and reduces the risk of capsizing .
• Adequate bridgedeck clearance to reduce slamming and provide better performance in rough conditions. A high bridgedeck also means less noise and slapping action from the waves hitting the boat bottom, thus ensuring a quieter, smoother ride.
• Comfortable sailing. To enjoy a quality life on board, you need comfort while at sea. Thus, elements like gentle movement, no creaks or groans, no bridgedeck slamming, and minimal pitching are essential for quality, peaceful and restful sleep.  

Now that you know what a cutting-edge catamaran features, let’s look at how to create the perfect cruising catamaran layout.  

Build a Larger-Sized Catamaran

The early catamarans ranged between 36-42 feet (10.9-12.8m). At the time, this appeared to be a good size in terms of safety and ease of handling. However, the boats were heavy, and the additional drag and displacement adversely affected their performance and windward ability. 

It’s now possible to make the new generation catamarans lighter, larger, and more spacious with excellent power-to-weight features. The current trend is larger-sized catamarans in the 45-50 feet (13.7- 15.2) range. Composite engineering and technologically advanced equipment such as furling systems, electric winches, and autopilot make it easier for a smaller crew to sail larger boats with confidence. And to do so without compromising safety or stability. 

Get the Best Catamaran Hull Design

A cruising catamaran’s performance depends on three main aspects; its length, the sail area, and the boat’s weight. Long boats are generally fast. A light boat with more sail area is also faster than a heavier boat with less sail area. In other words, you can make a multihull faster by making it longer, lighter, or adding more sail.

However, there are exceptions to this rule; a boat with too much sail area is more likely to capsize if there are brisk winds. Also, if the boat’s design makes it too light, it’ll be unable to handle much punishment, while a hull design that’s too slim would make the vessel incapable of carrying any significant loads. But that’s not all; if the boat is too long or too large, it’ll become grossly exorbitant. Narrow hull shape might also mean smaller cabins.

Nonetheless, these three factors alone are not enough to determine a cruising catamaran’s performance. While faster boats boast finer hulls, the wetted surface area tends to increase as fineness increases; thus, fine hulls end up becoming less fast in low wind speeds. Also, very wide hulls mean a reduction in actual performance.

The Prismatic Coefficient (Cp), a measure of how full the ends of the hull get, is the most essential design hull shape factor for any catamaran. A high Cp equals high speeds, although you can still use a lower Cp if you have fine hulls. Nevertheless, the key to a good Catamaran design is a higher Cp for fast sailing. 

To achieve a high Cp, there are several things you can do: 

• Fit bulb bows . Unfortunately, the bulb bows tend to slam in a seaway when you do this.
• Have an extensive planning aft section . However, this can increase the wetted surface area, WSA and lead to additional challenges. 
• Flatten out the hull rocker and add a bustle aft. This helps to add displacement aft. 

Build Convertible Main Living Spaces

The open cockpit is now a thing of the past. Instead, pioneering designers for catamaran manufacturers like Nautitech, Gunboat, and Catana now replace traditional-style salons, cockpits, and cabins with spacious indoor and outdoor living spaces. The concept involves merging separate saloon and cockpit areas with duplicate lounge spaces and the use of hard-wearing composite materials. 

You can also design the cabin to suit your preferences. You may decide to add a cabin or remove one, add a bathroom, have the forward berth in the hull or on the wing deck.

• The design enhancements boost usable space while opening up the living areas.
• It reduces time and costs for interior maintenance and cleaning. 
• Large windows bring in more light, increasing visibility. 
• Luxurious, spacious, and airy owners’ cabins provide more comfortable living space. 

Bulkhead Helm Stations vs. Twin Stern Steering

Many catamaran owners have traditionally preferred bulkhead steering. This helm position remains popular, but twin stern steering positions come with more advantages since they provide greater sails visibility. The twin stern positions are also best suited for racing or day sailing since they often lack adequate protection for extended cruising. 

Exposed helms are not ideal for a long ocean passage. Go for a safe, secure, and well-protected helm station that provides good visibility and comfortable space for long watches. Again, it’s best to have all control lines at the helm to establish a static control station. Also, have all push-button-controlled winches, instruments, windlass, and autopilot prominently located inside the cockpit. 

• Twin stern steering positions give you a better view of the sails
• You get a better feel for overall sailing conditions.
• Twin stern steering positions lack the necessary protection for extended cruising. 

Go for the Flybridge Design

The flybridge design is appealing because it offers excellent visibility, more comfort, and additional entertainment and lounging space for everyone on board. Unfortunately for smaller boats – those below 50 feet (15.24m), there is minimal protection from the elements. As such, you might want to consider adding enclosures to offer protection. The flybridge, thus the helm, remains cut off from the vessel, which makes communicating with the crew a challenge. 

• It provides great visibility.
• It offers comfortable spacing. 
• It might be unsafe to move from the cockpit to the flybridge in bad weather.
• It isn’t easy to communicate with the crew.

Daggerboards vs. Fixed Keels

Average cruising catamarans typically utilize fixed keels while high-performance cats have daggerboards . Fixed keels allow you to beach your catamaran easily, and your hull remains intact if a collision occurs. While you lose some angle when sailing upwind, you gain more interior space in the hulls that you can put to good use.

Daggerboards are essential in a performance cruising catamaran since they guarantee that the boat delivers good upwind sailing, including during difficult situations. During long passages, they allow you to point better upwind though the drawback is that they consume much interior space within the cruising catamaran’s hulls.

Since flying on foils ( hydrofoils ) isn’t that practical on cruising catamarans, designers of larger-sized boats have also come up with modified daggerboards. These daggerboards produce lift and prevent leeway, too, thereby improving performance significantly, as seen with the Catana 59’s curved daggerboards. These foil-like daggerboards lift the boat ever so slightly upon reaching higher speeds, making it feel less heavy and much faster. 

At the end of the day, calculating the performance of a boat sailing in a wide range of varying seas and winds might not be easy – despite a daggerboard or fixed keel configuration. This is because upwind speed depends not only on the sails’ quality but also windage and the height of the bridgedeck beyond the water.

• The design innovations -curved daggerboards and hydrofoils- improve catamaran performance significantly.
• Daggerboards enable you to access otherwise inaccessible anchorages.
• Daggerboards take up hull space in the hulls of your vessel.

Galley Up vs. Galley Down

Galley layout are becoming more and more important as more people, including families, start sailing regularly. While at sea, your galley needs to be a safe place, well-ventilated, and functional. Everything should be well-thought-out for the sailor’s comfort, including handholds to make it safer to move around the boat. 

While the galley location can either be up the bridgedeck or down in the hull, galley up appears to be the most popular trend. This makes the galley the focal point of both the living space and entertainment areas.

If you have a family, this placement is ideal since you make your meals from the galley and get to spend most of your time here. Many cruising families and couples prefer this arrangement and find separating the galley down the hull unappealing. Besides, carrying hot food up and down the staircase is unsafe.

Still, galley down is ideal for charter boats since it offers a private cooking area and uses up hull space efficiently.  

• Having the galley on the bridgedeck is ideal for families and cruising couples.
• Placing the galley on a similar level with the serving area and cockpit is safer and less tiring.
• There’s better ventilation on the bridgedeck, making for comfortable cooking. 
• There’s less kitchen privacy galley up.
• On smaller catamarans, this layout can impact the size of the saloon seating area significantly.

Production Catamaran vs. Custom

The choice of either a production catamaran or a custom design might seem pretty straightforward. Production catamarans from major brands come backed by proven designs, dependable construction, solid warranties, and many years of experience. The catamarans are easy to service, source for parts, and most – particularly the owner’s versions – hold on to their value, making them much easier to resell. 

On their part, custom boats are fantastic in that you can tailor them to your exact needs. However, they might be more challenging to maintain or service. That’s because of parts unavailability and lack of construction knowledge.

Choose Quality Construction Materials

The best quality materials to use on your catamaran are both light and robust. While carbon fiber is great, plywood, plywood/epoxy, and strip-cedar are excellent materials too. What’s more, they are also affordable, so you don’t have to get too hung up on cutting-edge building materials. What matters is build quality; thus, a well-built plywood catamaran boat can last as long as a boat made from more high-tech materials. 

Combining various materials also helps combat some of the issues that plague plywood boats in terms of resale value. At times, the design tends to make the boats appear pretty dated.  

• Plywood and strip-cedar materials are affordable and provide excellent build quality. 
• Plywood boats may have a lower resale value than those built with modern materials.

Consider Ease of Handling

An important factor in handling a cruising catamaran is deck layout. Most cruising catamarans sailed short-handed , so if your boat has one helm, all lines should run back here to allow for a static control station for the entire boat. 

The other essential element is visibility from the helm. The 360 degrees of visibility while maneuvering, docking, or underway is crucial to your boat’s safety, as well as life and property. As such, you should be able to view both bows, or at least the pulpits and sterns, while standing at the helm. If not, you may have challenges handling the boat due to blind spots.

Consider the Load Carrying Capacity

A well-designed catamaran is enjoyable to sail in all weather conditions. It’s also much easier to handle than a monohull because of its widely spaced twin engines. But when you immerse extra hull depth, the vessel gets sluggish and moves slower, maneuvering in tight spots or when docking becomes more challenging. Furthermore, the hull submersion reduces bridge deck clearance, leading to hull slamming. 

To allow for adequate load carrying capacity, you need a design that provides a generous displacement. This helps to ensure that you maintain reasonable bridge deck clearance even when fully loaded. It also allows you to avoid digging big holes in the water as you drag your transoms. 

Displacement refers to the amount of buoyancy designed into the hulls, which essentially means that your boat will cruise better if its weight is less than your designed displacement.

Note that an overloaded catamaran not only loses out on performance but eventually, on safety too. To counter this, choose a lightweight catamaran with hulls bearing cored construction and interiors made of lightweight materials.  

Remember, when you go cruising, you will need to carry fuel, extra water, supplies, equipment, and amenities, translating into thousands of extra pounds. Therefore, try and avoid the following design errors to ensure that your catamaran has an adequate load-carrying capacity:

• Avoid putting in place too much accommodation space.
• Avoid building a heavy boat ‐ use low-tech construction materials.
• Avoid installing inboards in a small boat.
• Lightly constructed catamarans perform faster and carry more weight.
• Cored construction makes for a strong and stiff catamaran, thus enabling good performance.

Final Thoughts

A well-designed cruising catamaran is a joy to behold. Today’s modern technological advancements mean that you can buy or build a light but strong cruising catamaran. And as you can see from this article, there are many excellent cruising catamaran layouts that you can choose from. 

However, whichever layout you decide on needs to fit your sailing needs and purposes to ensure you remain comfortable and safe while at sea. Above all, ensure that you go for a vessel that you can handle with ease in all weather conditions.

Owner of CatamaranFreedom.com. A minimalist that has lived in a caravan in Sweden, 35ft Monohull in the Bahamas, and right now in his self-built Van. He just started the next adventure, to circumnavigate the world on a Catamaran!

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James Wharram Designs

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Self build boats.

A philosophic attitude behind the Wharram designs is that 'urban man' can, with a little financial saving and some handcraft work, create an object of beauty. This object of beauty can then, for a period of hours, days, weeks or months, carry him/her out of the urban world into a natural never-never land; the seas and oceans; to a time when the world was young; when Mankind was directly and intimately interacting with the beauty and power of nature. There are hundreds/thousands of Wharram builders or, as I prefer to call them, "Sea People", who have done or are now doing that!" - James Wharram

A well built Wharram design is a 'Functional Kinetic Sculpture'" - Hanneke Boon

Everything you need to build your own sea-going catamaran: 3 steps

• Familiarise yourself with our range of designs and their unique qualities. For more detailed information read the Wharram Design Book which reviews each self-build boat model and offers a detailed introduction and understanding of the world of self-build catamarans.
• Order one or more sets of our Study Plans and immerse yourself into the boat builder's mindset; evaluate the costs; the amount of time required to build your boat; where you will build it and where you will eventually launch it.
• Once you have decided on the boat that is right for you to build, order the Boat Building Plans and become a member of the global family of Wharram builders and sailors. You can build a Wharram with very little experience . All Wharram building plans are drawn for the first time builder, so anyone with a modicum of practical ability can build one of our designs. Our Building Plans present quality instruction, guidance and advice for both novice and professional alike. They are all based on decades of actual building experience and thousands of ocean miles sailed, so you can be confident in your boat's capabilities and safety.

Tiki Designs

Coastal Trekkers To Long Term Live Aboards

From the car trailable Tiki 21 - winner of the 1982 Cruising World Design Competition, to the Tiki 46, a spacious ocean cruiser or charter boat, the TIKI range offers car trailable coastal trekkers to long term live aboards . Although a Tiki 21, a very popular coastal trek design, has circumnavigated, we would not recommend this for everyone! A number of Tiki 26s have also made ocean crossings, but again this is only for the experienced sailor. The larger TIKI designs of 30ft and over are craft capable of longer voyages and ocean crossings. They are designed to be less costly to build by using appropriate wood/epoxy technology and by eliminating, wherever possible, expensive metal fittings common to modern yacht design.

On the larger TIKIs the 'Deckpod' offers sheltered steering and the 'Stern Ramp' provides easy access to and from the water. The TIKIs are boats you can work and live on. The Wharram approach goes beyond simple boat design - the concept of 'Flexispace' puts emphasis on not just the physical living area, but also the 'mind space' of those on board.

Hitia Designs

Affordable Weekend Adventure Boats

The Hitia Designs are the perfect beach catamarans . They are 'coastal trekkers' and cater for those who do not want a craft for long distance or "blue water" sailing, but would like to be able to trail their boat to varied interesting coasts and lakes. Their easy economical construction, stability and speed makes for affordable weekend adventure boats . The Hitia 14 can be carried on the roof of your car and fits on the deck of a larger boat. The Hitia 17 has more stowage space and room for a tent on deck for longer excursions. These boats are ideal for small adventures and coastal treks.

Introducing: the Mana 24 'Cat Kit'

Boat In A Box

The MANA kit is sold with all the plywood cut out by CNC cutter and pre-coated with epoxy, so building the boat at home will be a bit like assembling a flat-pack . All the parts slot together perfectly so a hull can take shape in a day. Building from such a kit takes away the worry of measuring and cutting all the boat parts , which can be quite daunting to many first time builders and saves a lot of time in the early stages of building. In designing the MANA, we looked sideways into the world of camping and have combined the innovative CNC cut "flat pack" boat-building concept with the philosophy of outdoor living to create the unique MANA camper-sailer, specifically designed for trailer sailing.

The ply parts will have a first smooth coat of epoxy already applied, cutting down time in coating and sanding, so within a short time you will be able to assemble the hulls and see the boat you are building. As she is built from a pre-cut kit, we have been able to give the Mana more complex and beautiful shaping, giving her more interior volume than the Tiki designs.

Pahi Designs

The More Evocatively 'Female' Of The Wharram Designs

From the Coastal Trekking Pahi 26 to the impressive 63' flagship of the Wharram fleet 'Spirit of Gaia' - the PAHI shape is more evocatively 'Female' than the Classic Wharram designs. They are a different visual/sculptural approach to the basic design elements inherent in the Classic Designs. Constructively, they are simpler to build, using epoxy fillets instead of more difficult wood joints . They are designed to use quick growing softwood plys, coated and glassed with epoxy to achieve a durable finish. The PAHI designs were the first to use rope lashings to attach the crossbeams, giving a shock absorbing effect, without the need for metal fittings. 'Pahi' in Polynesian dialects means 'ship'.

The Pahi 42 'Captain Cook' design set fresh ocean cruising standards when she was designed in 1979. The Pahi 63 was designed in 1986 and launched in 1992 to become the new ocean going flagship for the Wharram family. During the construction of 'Spirit of Gaia' many unique new solutions to plywood and epoxy building methods were developed, which were later incorporated in the larger TIKI and ISLANDER designs.

Ethnic Designs

Traditional Pacific Sailing Craft

The Ethnic designs have been a new development at James Wharram Designs since James and Hanneke sailed extensively in the Pacific. With everything self-made these boats are lower cost to build . They cater for those who want a "traditional" Pacific sailing craft, built using appropriate modern materials and methods, but without trying to Westernise them. These designs arose after requests from Pacific Island peoples for James to design craft to overcome shortages of "traditional" building materials, but which closely reflect the cultural and ethnic origins of these craft.

Classic Designs

The Early Wharrams - Sturdy and Stable

The early 'Wharrams', now known as the Classic Designs, are recognised as beautiful, safe boats - easy to build, and easy to sail . Many anchorages around the world are graced by these Classic Designs, and of the seventeen drawn between 1957 and 1976, nine are still available, from the 16ft Maui to the 51ft Tehini. They were the first range of Wharram catamarans, designed in the 1960s and 70s, based on the sea experience of James Wharram's pioneering ocean crossings. They are sturdy, very stable, but relatively basic in design. They are built using simple plywood construction over a backbone and bulkhead frame .

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Catamaran Design Formulas

• Post author By Rick
• Post date June 29, 2010
• 10 Comments on Catamaran Design Formulas

Part 2: W ith permission from Terho Halme – Naval Architect

While Part 1 showcased design comments from Richard Woods , this second webpage on catamaran design is from a paper on “How to dimension a sailing catamaran”, written by the Finnish boat designer, Terho Halme. I found his paper easy to follow and all the Catamaran hull design equations were in one place.  Terho was kind enough to grant permission to reproduce his work here.

Below are basic equations and parameters of catamaran design, courtesy of Terho Halme. There are also a few references from ISO boat standards. The first step of catamaran design is to decide the length of the boat and her purpose. Then we’ll try to optimize other dimensions, to give her decent performance. All dimensions on this page are metric, linear dimensions are in meters (m), areas are in square meters (m2), displacement volumes in cubic meters (m3), masses (displacement, weight) are in kilograms (kg), forces in Newton’s (N), powers in kilowatts (kW) and speeds in knots. 

Please see our catamarans for sale by owner page if you are looking for great deals on affordable catamarans sold directly by their owners.

Length, Draft and Beam

There are two major dimensions of a boat hull: The length of the hull L H  and length of waterline L WL  . The following consist of arbitrary values to illustrate a calculated example. 

L H  = 12.20      L WL  = 12.00

After deciding how big a boat we want we next enter the length/beam ratio of each hull, L BR . Heavy boats have low value and light racers high value. L BR  below “8” leads to increased wave making and this should be avoided. Lower values increase loading capacity. Normal L BR  for a cruiser is somewhere between 9 and 12. L BR  has a definitive effect on boat displacement estimate.  

• Tags Buying Advice , Catamaran Designers

Owner of a Catalac 8M and Catamaransite webmaster.

10 replies on “Catamaran Design Formulas”

Im working though these formuals to help in the conversion of a cat from diesel to electric. Range, Speed, effect of extra weight on the boat….. Im having a bit of trouble with the B_TR. First off what is it? You don’t call it out as to what it is anywhere that i could find. Second its listed as B TR = B WL / T c but then directly after that you have T c = B WL / B TR. these two equasion are circular….

Yes, I noted the same thing. I guess that TR means resistance.

I am new here and very intetested to continue the discussion! I believe that TR had to be looked at as in Btr (small letter = underscore). B = beam, t= draft and r (I believe) = ratio! As in Lbr, here it is Btr = Beam to draft ratio! This goes along with the further elaboration on the subject! Let me know if I am wrong! Regards PETER

I posted the author’s contact info. You have to contact him as he’s not going to answer here. – Rick

Thank you these formulas as I am planning a catamaran hull/ house boat. The planned length will be about thirty six ft. In length. This will help me in this new venture.

You have to ask the author. His link was above. https://www.facebook.com/terho.halme

I understood everything, accept nothing makes sense from Cm=Am/Tc*Bwl. Almost all equations from here on after is basically the answer to the dividend being divided into itself, which gives a constant answer of “1”. What am I missing? I contacted the original author on Facebook, but due to Facebook regulations, he’s bound never to receive it.

Hi Brian, B WL is the maximum hull breadth at the waterline and Tc is the maximum draft.

The equation B TW = B WL/Tc can be rearranged by multiplying both sides of the equation by Tc:

B TW * Tc = Tc * B WL / Tc

On the right hand side the Tc on the top is divided by the Tc on the bottom so the equal 1 and can both be crossed out.

Then divide both sides by B TW:

Cross out that B TW when it is on the top and the bottom and you get the new equation:

Tc = B WL/ B TW

Thank you all for this very useful article

Parfait j aimerais participer à une formation en ligne (perfect I would like to participate in an online training)

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A Complete Catamaran Guide

There you are, out on the water when a strange craft approaches.  Is it a sailboat? It sure looks like one until it turns to face you.  That’s when you notice this boat doesn’t have just one hull. It has two hulls and it’s called a catamaran.

Catamarans are unique, and highly stable watercraft.  We’ll explore all the ins and outs of sailing the waters in one of these weird, and awesome multi-hulled craft.  Join me as we explore the wild world of sailing catamarans.

A History Of The Catamaran

It is believed that the first people to use a catamaran design were those living in Australasia.

The succession of boat design in this region was actually very interesting.  The beginning of boats in the area was simple, albeit conventional rafts. These were fashioned from logs strewn together with plant fiber lashings such as those formed using bamboo fiber.  

Catamaran Evolution

The conventional raft gave way to a minimal raft.  This design was basically a conventional raft with two cross beams added in the form of logs.  These would be eventually hollowed out to improve buoyancy.

The next step in the evolution of boats in the Australasian region was the double canoe.  This proved to be the first real catamarans.  

After some time, the form evolved further into the asymmetrical double canoe design.  In this design, one canoe was large and the other attached canoe was smaller.

The asymmetrical design quickly evolved into the single-outrigger boat like the one shown in the photo below.

The final stage of the evolution of the catamaran in the region was to gain a second outrigger.  This in effect created the trimaran with the single central hull and dual outriggers.

Eye Witness Accounts Of Catamarans

In 1697, William Dampier wrote of witnessing a type of seafaring vessel off the coast of Coromandel.  He noted how the locals called the type of boat a catamaran. He also noted that it had multiple hulls (logs) and that they were small vessels that the person operating would have to hang partway into the water, straddling the hull (log).

The name catamaran came from the Tamil.  And yet, it was easily applied by the European visitors to the two hulled sailing vessels that sped across the water in the region.

Although Dampier may have described the catamaran in the 1690s, the type of boat was actually used as early as the 5th century by the Tamil Chola dynasty.  They used boats to move their troops from one island to another. Using this design of boat allowed them to travel heavy, travel quickly and was partially responsible for the conquering of neighboring Burma, Malaysia, and Indonesia.

Building A Boat – Basics Of Catamaran Construction

A boat is usually thought of as being a single-hulled vessel that travels along the surface of the water.  It can have multiple types, shapes, and designs of the hull. However, it is often only thought of as having a single hull.  But, what if it had two hulls? Would that be like taking two separate boats, and making a raft over both of them? In essence, that is exactly what a catamaran is:  two boats made into one.

Advantages Of Multiple Hulls

• More stability than a monohull
• Wide supporting base allows for larger sails than monohull craft of the same length
• Hull does not require the deep-running keel of a standard monohull sailboat
• Less hull drag in the water than a monohull
• Less power required to drive a catamaran forward than a monohull boat

Disadvantages Of Multiple Hulls 

• Due to multiple hulls, construction is more expensive than a monohull design
• Catamaran speed relies on lightweight materials to make a lightweight craft.  This also drives up the cost of construction.
• Extra engineering requirements for multi-hull craft also increase the cost of construction.

Conclusion?  Well, it looks to me like everything about catamarans points towards superiority over monohulls in nearly every way.  But, you get what you pay for. I think the same thing likely applies to cars too. For instance, I have a performance car that cost me about 10k more than the equivalent non-sports car within the same class. 

Yet to drive the vehicle, it performs so much better than the normal version of the car, it really speaks volumes to the difference between a common vehicle, and a performance one.

Speaking of performance vehicles, let’s take a look now at the different kinds and uses of a catamaran.

Catamaran Types

Commercial catamarans – ferries.

One of the most common uses for a catamaran is the commercial use of the vehicle design when it comes to ferries.  This is likely due to the wide, flat deck possibilities of a catamaran versus a monohulled boat. Not only that, but the catamaran is also a much more stable bodied vessel.  This again makes it a superior design for transporting larger land vessels like trucks and so forth. They can easily drive on the ferry without fear of the ferry tipping over.

Some ferries are designed for taking vehicles, like the one you might find in the city of Toronto.  Where it transports cars from the mainland to Toronto Island. Others are designed specifically with the sole purpose of transporting people. I took a look at one such ferry that operates in Germany.  Take a look at the following case study.

Commercial Use Case Study – The Ferry

The FRS Helgoline is a ferry catamaran operating out of Flensburg, Germany, close to the Danish border.

According to the ferry company’s website, the ferry runs using four main engines which are run to a capacity of 12,182 hp combined.  This blasts this ferry at a speed of 35 knots or 65 km/hour. This is equivalent to 40 miles per hour. That’s pretty good considering the size and weight of the ship body this catamaran can carry.

Speaking of capacity, the ship can carry 680 passengers. At 56.4 meters long (185 feet) by 14 meters wide (45.9 feet), that’s a decent passenger capacity. 

Catamaran Passenger Capacity Versus Monohull Boat Passenger Capacity 

The general rule for calculating passenger capacity for a boat is as follows.

Length x Width / 15 = Passenger Capacity

Therefore, the FRS Helgoline should have a calculated capacity calculated as follows.

185 x 45.9 / 15 = 566  

But it actually has a capacity of 680 which is a 20% increase in capacity over a standard monohull.

For comparison, let’s look at a superyacht.  A 48.5m (159 feet) long by 10.7m (35 feet) beam (width of the boat) Palmer Johnson Supersport 48 (valued at about $28.5 million dollars) should have a capacity calculated as follows.

159 x 35 / 15 = 371

In short, 26 feet of difference in length equates to 309 fewer passengers.  It is almost half of the capacity of the catamaran at 26 feet longer length.

Photo courtesy of https://sysyachtsales.com/

Commercial Catamarans – Service Vehicles

Although Catamarans are typically used as ferries due to their stability and ability to carry wide loads on their flat decks, there are many different service catamarans out there as well.  From a support vessel to a crew transfer or search and rescue, catamarans are a solid and stable platform to build a ship on.

This is the Ardea which is a 20 meter (65.6 feet) catamaran to be used for crew transport and as a support ship.  This ship was built by the Echo Marine Group and delivered to Western Australia in early 2019. This particular vessel is in the service of the Cape Preston Sino Iron Project.  

Catamarans are used all around the world, for a variety of tasks, not just ferries or support craft.

Commercial Catamarans – Cruise Lines

Now these are the catamarans we all want to be aboard, aren’t they?  Due to the wide stance, these ships can feature massive halls and wide-open interior areas.  These ships are stable, and some would say even more stable and safer than monohull design ships.  

There are many cruise ship catamarans in use today around the world.  Some of the more ‘famous’ catamaran cruises are those which investigate the Galapagos Islands.  There are several high-end, small fleet, cruise lines operating to the Galapagos which utilize catamaran design vessels as their primary ship type. 

These ships can be extremely comfortable and stable and often offer some reprieve to those who may otherwise feel seasick. It won’t stop the feeling, but the more stable the hull, the less the boat rocks around.

Military Catamarans

Catamarans make excellent military transport vessels.  They are stable and the potential to have a large, flat and wide deck for transporting land craft, troops or acting as a landing pad for vertical take-off aerial craft.  The stability of the two hulls makes the vessel an excellent candidate for military use, and thus it is used for said purpose.

As you can clearly see in the image of the USNS Spearhead, the rear of the vessel has a moveable ramp that can be used for loading and unloading land vehicles.  The interior bay of the craft is visible in the image as well, a large area for storage of vehicles, supplies and more. The crane arm on the back of the ship also shows how it is a versatile craft, set up to act as an excellent support craft with a helicopter landing pad and ample storage and freight capacity.

Recreational Catamarans

Catamaran Personal WatercraftThe wind is in your hair, the warm spray from the hull cutting over the edge of each wave as you skip over the water.  That is life, let me tell you. Personal watercraft have come a long way over the years and the small one, two, three and four-person catamarans have come a long way as well. 

Depending on the options, you can get a small one or two-person catamaran for as little as $1500 new.  That might be an inflatable though. There are some very nice, rigid hull designed catamarans for 1-4 people that range from $3500 to $15000.  And these are basically open, personal watercraft like that shown in the image below.

Using a small catamaran can be quite challenging to learn at first.  Sailing is not for the faint of heart. It requires skill, technique, knowledge of the wind and sea, and a bit of hard work.  But it can be fun, rewarding and a great way to catch some sun and fresh air out on the water. It’s a relatively GREEN sport as well.   Given the use of sails over gas-powered motors that is.

‘Sailing Cats’ – Sailing Catamarans – Yacht & Luxury Class

Here’s where we get into the dreamy boats of the rich and famous.  I priced out a small 43’ luxury Leopard 40 sailing catamaran. Even before I added any extras at all, the base price was $399,000 USD.  I imagine if I added a few of the multiple extras available, and some tax, freight and that sort of thing, I’m easily in half a million dollars.  And that’s the smallest base model.

There are all kinds of luxury catamaran shipbuilders across the world.  From Asia to Europe and The Americas, it seems any major boating country has at least one company building luxury catamarans.  It’s weird that you don’t see more of them on the water though, don’t you think?

Being sailing vessels, these luxury cats require some training in sailing before you get behind the wheel.  And considering the price point, I would definitely want to be at least a semi-decent sailor with some good few years experience under my belt before I would comfortable at the helm of a half-million-dollar sailing cat.  It’s all relative I suppose. I imagine a billionaire might bat an eye at the prospect of wrecking a half-million-dollar boat. But to me, and most of you reading this, that’s likely a lot of money.

‘Power Cats’ – Powered Catamarans

The powered catamaran is one of my favorite boats.  They have sort of a muscle car appearance with the wide and often tall front end of the boats.  I find it to be reminiscent of a large air intake on the front hood of a rally race car like the Subaru WRX, for instance.  These boats are fast, they are stable and handle very well. Catamarans are often considered the boat of choice for long sea voyages due to their stability.  

A powered catamaran will definitely cost more than a powered monohull boat of the same length.  Why? Well, the powered catamaran has one crucial downside. That is, it needs two engines. One for each of the two hulls.  Otherwise, it’s off balance for propulsion. These two engines or motors have to be in sync with each other or again, the propulsion will be off-balance.  Because they have two motors, they have double the maintenance when it comes to maintaining the propulsion system.

More components also means a greater chance of things breaking down.  In essence, it doubles the chances of the ship having a motor break down. The saving grace is that should one motor break, they have a backup, even if it does mean very unbalanced propulsion.  In contrast, a monohull vessel of the same length may only have half the chance of motor failure due to only having one motor, but if that one motor breaks, then what? Call for help, that’s what.  A cat would have a struggling chance to get itself back to port. A monohull would be dead in the water unless it was carrying spare parts or another motor onboard somewhere.

Catamaran Frequently Asked Questions

What is a catamaran cruise.

A catamaran cruise is simply a cruise on a dual hull design boat.  Often used for river cruises, the catamaran which is used as cruise ships are often considerably smaller than their giant monohulled counterparts.

What is the purpose of a catamaran?

A catamaran is a design for a boat that utilizes two hulls.  Due to the flat, platform-like-potential for the deck of the boat, the catamaran is often purposed with transporting materials, vehicles, and people.  For instance, catamarans are quite often used as ferries.

Is catamaran safe?

Catamaran are very safe water craft.   The design of riding on two hulls separated by a gap in between, in essence is like giving a car a double-wide wheel base.  The wider the stance, the more stable the craft, from side to side anyway. And if the length of the boat is proportional to the width, then it becomes an extremely stable craft.  That is why catamarans are often considered the best to be used for long voyages. Yes, catamaran are safe.

What is the difference between a catamaran and a sailboat?

A traditional sailboat is a deep, monohull vessel that has at least one mast extending high into the air above the deck to hold sails.  A catamaran refers to the design of a dual-hull boat and really has nothing to do with sails. Although, catamaran do make excellent sailing boats as well, they are quite capable of acting as power boats and do not require sails if they have the correct amount of powered motors to propel them.  Sailboats, although also able to be powered if a motor is provided, are traditionally monohull and wind-powered exclusively.

Do catamarans have small interiors?

The size of an interior cabin on a boat is typically proportional to the size of the boat itself.  If a catamaran has above-deck cabins, they will likely be able to be of a larger design than those you would find on deck of a monohull boat.  This is because a catamaran has a much wider footprint than a monohull boat of the same length. This extra width would allow for larger on deck cabins.  

How much does a catamaran cost?

A personal watercraft (1-2 person) inflatable catamaran will run you anywhere from $1500-$12000 USD, depending on the quality and features.  The rigid hull catamarans of the same size start at about $4500 USD.

A small cabin cruiser type of catamaran will typically start at about $60000 for a small base model and the price just goes up and up depending on size and features.

For Instance, a 40’, 3 cabin with 1 washroom cat will cost you about $500,000 USD for the base model.  They are considerably more expensive that a monohull of the same length. However, the trade-off is greater stability and a smoother, more comfortable ride.

Is a catamaran more work to maintain?

Technically yes.  Due to having two hulls and if powered, two motors and likely also water jets, this means you have double the oil changes of a boat that would have a single motor.  Once you get past the basic engine and hull maintenance, a catamaran is not that much more work than a monohull ship of the same length.  

The trouble with catamarans in terms of maintenance, is that once they reach a certain length, the width becomes more than a standard lane on the road.  That being said, if you ever need to transport the boat via land, it can be quite the challenge. Especially if you need to pay to have a police escort for an extra-wide trailer.  And special licensing might be involved as well.

What is the difference between a catamaran and a trimaran?

A catamaran is a dual hull boat.  In other words, it has two hulls. A trimaran has three hulls.  

Is a catamaran considered a yacht?

According to Oxford dictionary, a yacht is a medium-sized sailboat equipped for cruising or racing.  A catamaran, on the other hand, is a boat with two hulls. Therefore, a catamaran can most certainly also be a yacht.  And likewise, if a yacht has two hulls, then it is a catamaran as well.

Can you get seasick on a catamaran?

Seasickness occurs when a person feels nauseous from the swaying motion of a rocking ship.  These feelings may be lessened on a catamaran, due to their extra stability. However, a catamaran may be slightly more stable than a monohull of the same length, but it is still a boat.  And it will still make someone who experiences seasickness continue to feel the ill effects.

Are catamarans more stable in rough seas?

Catamarans are known to be more stable than monohull ships of the same length.  This is why catamarans are often the ship type of choice for long sea voyages due to their stability.

Why do catamarans capsize?

Catamarans are not known for capsizing.  The larger vessels that is anyway. But, it does happen from time to time.  Catamarans are known for their stability, so typically if a capsize event should occur, it is typical for them to be extreme circumstances.  

Personal watercraft catamarans are a different story though.  These are in fact known for tipping over. Not because they are less stable than their monohull counterparts of the same length.  But instead, because they are able to go considerably faster than monohull personal watercraft of the same length (not including powered craft though).  This is due to the sailing cats being able to have a larger sail than a small monohull sailboat of the same length.

Due to the extra sail, they are able to travel faster than monohull sailboats of the same length.  This allows them to whip around on the water and at higher speeds, whipping your cat about quick can easily send it over sideways. Extra speed means fast turns carry momentum in the direction of travel and that extra speed equates to tipping over if turned too fast.  To sum up, they capsize due to user error or extreme events.

Which is safer, a catamaran or a monohull?

Due to the extra stability of having a wider footprint than a monohull, a catamaran of the same length is the safer vessel.

Are catamarans safer than sailboats?

The same rule applies to stability versus the length of the hull.  A cat will always be the more stable length for length. However, due to their ability to go much faster than a monohull sailboat, this kind of cancels out some of the added safety due to stability.  With that in mind, they may just be about the same but there is one generalization we can make when comparing the safety of catamarans vs sailboats: At the same speed, and of equal length, sailing or power catamaran will be safer than a monohull sailboat.

How fast can catamarans go?

The speed a catamaran can go is entirely dependent upon the hull design, weight of the vessel, the strength of propulsion (be it wind or powered) and so on.  The general rule is that in terms of sailing cats vs monohull sailboats, a cat of equal length can typically go faster than a sailboat.  

In terms of powered cats vs powerboats, a powered catamaran will typically require less energy to move forward than a monohull of the same sort of hull design (but monohull of course) and thus a cat should, in theory, be able to go faster than a monohull when both are using propulsion that is equal in power.

Bibliography

• Wikipedia – Catamarans
• Mahdi, Waruno (1999). “The Dispersal of Austronesian boat forms in the Indian Ocean”. In Blench, Roger; Spriggs, Matthew (eds.). Archaeology and Language III: Artefacts languages, and texts . One World Archaeology. 34 . Routledge. pp. 144–179. ISBN 0415100542 .
• Wikipedia – Spearhead -class expeditionary fast transport
• https://www.tiki-toki.com/timeline/entry/169516/Origin-of-the-catamaran/#vars!panel=1620923!
• https://www.austal.com/ships/passenger-express-56
• https://www.adventure-life.com/galapagos/galapagos-catamaran-cruises

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Modern Catamaran Trends: Gimmicks or Valid Design Ideas?

The celebrity of the catamaran is not only swelling in racing, but also for cruising catamarans. At their conception, the atypical design enabled cats to sail faster and in shallower waters with less wind and crew than other sailing vessels. But for years the unorthodox design met with skepticism, leaving the catamaran with little commercial success. Additional challenges to adoption of early versions of cruising cats were the small, very cramped interiors by modern day standards, was heavy and lumbering handling abilities. Many sailors used to say they “were built like tanks and sailed like bricks”.

However, sailors soon realized that nothing could beat the comfort, speed, and safety of a well-designed modern catamaran as a cruising yacht. These vessels can achieve the highest speed for the smoothest ride and boast the most interior space and greatest safety of most ocean-going vessels. Sailors of all types are quickly overcoming earlier prejudices against the multihull design as contemporary design trends continue to produce catamarans that are faster, more exciting, more visually interesting, and safer than ever before.

The New Trends

Fun and interesting new trends in catamarans make sailing even more exciting than ever before. However, innovations are only useful if they contribute to good design, construction, and safety principles and it should fit your sailing purposes. Let’s take a look at some trends in modern cats:

1. Larger Catamarans for Fewer Crew

The new generation of catamaran, using modern composite construction and engineering can be built lighter, larger, and more spacious with very good power-to-weight characteristics. Currently, the trend leans increasingly towards larger catamarans. The average catamaran for a cruising couple now tends to be more in the 45ft to 50ft range. With composite engineering and installation of technologically advanced equipment, e.g., electric winches, furling systems, and reliable auto pilot, it is now possible for shorthanded crews to confidently sail larger boats with larger rigs. Technology has enabled modern catamarans’ bigger volume with more stiff and torsion resistant construction, without compromising stability and safety.  

2. Inside Out: Convertible Main Living Areas

The design improvements of convertible living areas not only increases usable space and opens up the living areas, but also reduces interior maintenance and cleaning issues of traditional varnished wood surfaces. An open and convertible main living area with simple, hard-wearing composite materials reduces costs and time required to clean and maintain the boat. Big windows and opening vents allow light in and increase visibility. Gone are the submarine-like claustrophobic cabins typical of most traditional yachts. Owners’ cabins are luxurious, airy, and spacious serving as a very comfortable living space, rather than just a place to sleep. 

3. Wave-Piercing or Reverse Bows

4. Bulkhead Helm Stations or Twin Stern Steering?

However, Gunboat moved the cockpit back under cover in its latest designs, just as Leopard introduced a forward cockpit with opening doors into the leisure-focused salon in their Leopard 44 and 48 models. The team at Catamaran Guru questions the suitability of this design feature for blue water catamarans that will encounter large seas, but nonetheless, it is a popular trend especially for the yacht charter market. 

Ultimately for a cruising catamaran, our preference is a safe, protected helm station with good visibility and all the control lines leading back to the helm to create a static control station. Push-button controlled winches and windlass as well as the instruments and autopilot should be prominently located and protected within the cockpit.  

5. The Flybridge Trend

Getting from the cockpit up to the flybridge and back down in bad weather can prove unsafe. To accommodate the flybridge, the goose neck and boom must be very high making stowing the main problematic. The higher gooseneck position also means that the center of effort is higher which impacts the vessel’s righting moment and is not as good as catamaran with a lower boom position and bulkhead steering. Just where the flybridge design will go is anybody’s guess but right now it has huge appeal for a lot of people. 

6. Hydrofoils and Daggerboards

Because of design innovations like curved daggerboards and the hydrofoils, performance on cruising catamarans has improved tremendously but catamaran speed is relative. The most important benefit of speed of a multihull is the ability to outrun bad weather. Being able to average 2-3 knots faster on a catamaran than on a monohull, can help avoid bad weather. Many cruisers often tell us at Catamaran Guru, “I don’t care about performance,” but its not long before they understand that the heavy cruising cat is not quite as comfortable at sea – AND very slow. It makes no sense to buy a catamaran that will not sail at least 200nm per day when making passage. 

7. Galley Up or Down

In modern catamarans, the most popular trend currently is galley up, making it a focal point of the main living and entertainment areas. When at sea, every meal comes from the galley, so live-aboards spend a lot of time in the galley and many cruising couples and families find that the separation of galley down in a hull is not ideal. When at sea, hauling hot food up and down the stairs is a safety hazard. Having the galley on the same level as the serving area and cockpit is less tiring and safer. Also, ventilation is better on the bridgedeck than down in the hulls, which makes cooking more comfortable, especially if you are prone to seasickness. The disadvantage of the galley up design is less privacy for the cook’s messes and it can significantly impact the size of the saloon seating area, especially on smaller cats.

Some manufacturers like the St Francis 50 and Antares 44 still trust in the galley down design. Galley down is often preferred for charter boats because it provides a private, self-contained cooking area with dedicated prep areas and utilizes space in the hull that might otherwise be less efficiently used. However, the most popular trend is galley up and it makes sense to most sailors, especially cruising couples and families.

More on our take for galleys up or down .

Is Speed and Interior Comfort Trumping Good Design?

• Catamaran stability is a function of beam and buoyancy, so light-weight strong construction, which translates into buoyancy, is a good thing. Typically cruising catamarans have a beam-to-length ratio of roughly 50%, meaning a 45′ long cat will be about 22′ wide. This will not only result in great interior space but also in a very stiff and efficient boat.
• The boat needs to have a robust COG (center of gravity) through good buoyancy fore and aft or waterline length to avoid “hobby horsing”, making for a smoother ride and better performance. Performance is a safety issue; it is always better to have the pace to get out of the way of bad weather. So some speed in reserve is great.
• Good bridgedeck clearance is important for seaworthiness and crew comfort at sea, by reducing slamming and better performance in rough conditions. However, a very high bridge deck clearance, together with, say 6.5ft of headroom in the saloon, the boat will be very high with a lot of windage. So there has to be a balance struck between bridge deck clearance and the height in the salon. A good rule of thumb for bridge deck clearance is to have good clearance is about 5% of overall length of the hull but 6% is excellent. A clearance of 4% is acceptable but on the low side.

Even in the age of computer modeling, yacht design remains a series of compromises and the use of a boat will dictate its visual design and performance characteristics to a large degree. A well-designed catamaran is ergonomic and pleasing to the eye. It should be sensible and safe, with performance that can get to a safe harbor when necessary. It all comes down to safety and comfort, especially in rough conditions.

Looking to buy a yacht? Contact us if you have any questions regarding catamarans for sale , Fractional Yacht Ownership or our Charter Management Programs .

Estelle Cockcroft

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2 thoughts on “Modern Catamaran Trends: Gimmicks or Valid Design Ideas?”

Good reading, informative and to the point. There is no reference to building standards and codes of practice. The Catamaran industry needs to “mature “ as more models and brands enter the market with the consumer paying for the downward spiral. Look forward to your next article.

Hi Gregor, you are right. There is no one uniform set of standards. Most countries have published guidelines, codes or laws that a boatbuilder must follow in order to sell a boat in that country. Some of the better known ones are USCG, ABYC, CE, AS/NZS and ABS. There is a lot of similarity between the different international regulatory bodies but just as many differences. Enforcement of these standards are sketchy. Labels are applied to boats i.e. “in compliance,” “certified” or “classified.” and it all means little if not enforced. In the US, it’s mostly up to the builder to voluntarily comply with the published guidance ( the all do since it’s in their interest). In the European Union, by law a boat has to be inspected, documented and certified. Australia and New Zealand publish their own set of rules. So it’s a miss mash of laws and rules and it’s hard for the consumer to pin down!

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Learn the Basics of Small Catamaran Sailing: A Step-by-Step Guide

Alex Morgan

Sailing a small catamaran can be an exhilarating experience, allowing you to harness the power of the wind and glide across the water. Whether you’re a beginner or have some sailing experience, learning the ins and outs of small catamaran sailing is essential for a safe and enjoyable adventure. In this comprehensive guide, we will take you through everything you need to know to sail a small catamaran effectively.

Introduction to Small Catamarans

Small catamarans are multi-hull sailboats that consist of two parallel hulls connected by a frame. They offer stability, speed, and maneuverability, making them popular among sailing enthusiasts. Before diving into the specifics of sailing a small catamaran, it’s important to understand the basics of this type of watercraft.

Getting Started with Small Catamaran Sailing

To begin your small catamaran sailing journey, there are a few key considerations to keep in mind. Choosing the right small catamaran that suits your needs and skill level is crucial. Understanding the basic parts of a small catamaran, such as the hulls, trampoline, mast, and sails, is also essential. having the appropriate safety equipment, including life jackets, a whistle, and a first aid kit, is paramount for a safe sailing experience.

Learning the Fundamentals of Small Catamaran Sailing

Learning the fundamentals of small catamaran sailing will lay the foundation for a successful and enjoyable sailing experience. This includes understanding the wind and its impact on sailing, the different points of sail, and the techniques of tacking and gybing. Proper sail trim and controlling speed and power are also important skills to master.

Basic Maneuvers in Small Catamaran Sailing

Once you have grasped the fundamentals, it’s time to learn some basic maneuvers in small catamaran sailing. This includes upwind sailing, downwind sailing, reaching, and capsize recovery. Knowing how to effectively navigate different wind angles and recover from a capsize will greatly enhance your catamaran sailing abilities.

Advanced Techniques for Small Catamaran Sailing

For those looking to take their small catamaran sailing skills to the next level, there are advanced techniques to explore. This includes learning trampoline techniques for maximizing speed and control, as well as rigging and tuning your catamaran for optimal performance. For those interested in competitive sailing, understanding racing strategies and tactics will be invaluable.

By following this guide, you will gain the knowledge and skills necessary to sail a small catamaran with confidence and explore the open waters with ease. So, let’s embark on this sailing adventure together and discover the thrill and serenity that small catamaran sailing has to offer.

– Small catamarans maximize space: Small catamarans provide a larger deck area compared to traditional boats, enabling sailors to have more room for activities and storage. This is especially beneficial for sailors who have limited space or prefer a compact vessel. – Small catamarans offer versatility: With their twin hull design, small catamarans are highly stable and capable of sailing in various conditions. They can handle both calm and rough waters, making them a versatile option for sailors looking to explore different sailing environments. – Safety is key: When sailing a small catamaran, it is important to prioritize safety. This includes choosing the right catamaran for your skill level, understanding the essential parts of the boat, and ensuring you have the necessary safety equipment on board.

Embarking on the thrilling adventure of small catamaran sailing? This section is your compass to getting started! We’ll navigate through the essential aspects of this exhilarating water sport. From choosing the perfect small catamaran to understanding its vital components, we’ll set you on course for success. Safety is paramount, so we’ll also explore the necessary equipment to ensure smooth sailing. Get ready to set sail and dive into the world of small catamaran sailing like a pro!

Choosing the Right Small Catamaran

To choose the right small catamaran, consider key factors. Here is a table summarizing important aspects to take into account:

Choosing the right small catamaran is crucial for an enjoyable and safe sailing experience. Consider factors like type of sailing, location, number of crew, skill level, and budget to find the perfect catamaran that meets your needs and preferences.

Fact: The fastest recorded speed on a small catamaran was 51.36 knots (about 59 mph), achieved by Paul Larsen of Australia in 2012.

Understanding the Basic Parts of a Small Catamaran

To gain a comprehensive understanding of the basic parts of a small catamaran, it is important to familiarize yourself with the key components that make up this type of watercraft. These components include the following:

1. Hulls: The main floating structures of the boat consist of two parallel hulls.

2. Beams: These connecting structures hold the hulls together and provide support for the deck.

3. Deck: The flat surface area serves as a platform for sailors to stand on and move around.

4. Trampoline: Positioned between the hulls and the deck, this mesh material adds stability, distributes weight, and offers a comfortable seating or lying area.

5. Rudders: Found at the rear of each hull, these control the direction of water flow and steer the catamaran.

6. Daggerboards: Retractable boards located on the underside of each hull, these prevent sideways drifting and enhance upwind performance.

7. Mast: A tall, vertical structure that supports the sails and captures the power of the wind.

8. Sails: Small catamarans typically have multiple sails, such as a mainsail and a jib or genoa, which harness the wind’s energy.

9. Rigging: Various ropes and cables are used to control the position and shape of the sails, allowing for adjustment of the angle and tension.

10. Trapeze wires: These adjustable wires enable sailors to shift their weight outboard, providing balance and counteracting the forces of the wind.

Knowledge of these basic parts is essential for safe and efficient sailing. Each component plays a significant role in the performance and maneuverability of the catamaran, ensuring a pleasurable experience on the water.

Essential Safety Equipment

The essential safety equipment for small catamaran sailing includes:

Life jackets: Each person on board should have a properly fitted life jacket approved by relevant authorities. Ensure accessibility and good condition.

Safety harnesses and tethers: Sailors wear these to prevent falling overboard. Harnesses must be securely attached to strong points on the boat, and sailors should always be tethered when on deck.

Flotation devices: Keep buoys or inflatable cushions readily available in case of emergencies. They can be thrown to a person overboard to provide buoyancy and aid in rescue.

Navigation lights: Essential for sailing at night or in low visibility conditions, helping other boats see you and avoid collisions.

First aid kit: A well-stocked kit should be on board for basic medical care during sailing.

Fire extinguisher: Crucial in case of fires or emergencies. Regularly check and maintain the extinguisher.

True story:

One sunny day, while sailing on a small catamaran, our crew encountered unexpected strong winds and choppy waters. Suddenly, a crew member lost their balance and fell overboard. Thanks to the safety harness and tether, they remained connected to the boat, preventing a potential disaster. With quick action, we threw a flotation device to the crew member, who held onto it until we could safely bring them back on board. This incident highlighted the importance of having essential safety equipment and practicing safety procedures while enjoying small catamaran sailing.

Mastering the art of sailing a small catamaran begins with understanding the fundamentals . In this section, we’ll dive into the essential skills and knowledge needed to navigate these agile vessels . Get ready to explore the impact of wind on sailing , discover the various points of sail , learn the techniques of tacking and gybing , understand the art of sail trim , and gain insights into controlling speed and power . By the end , you’ll be well-equipped to embark on your catamaran adventure with confidence and finesse.

Understanding Wind and Its Impact on Sailing

Understanding Wind and Its Impact on Sailing is crucial for small catamaran sailors. Consider the following key points:

– Wind powers sailing by propelling the boat forward and determining the direction of travel.

– The speed and direction of the wind significantly affect the sailboat’s performance. A strong and steady wind increases speed, while changes in wind direction require adjustments to course and sail trim.

– Sailors must understand different points of sail. These include close-hauled (sailing as close to the wind as possible), reaching (sailing at a slight angle to the wind), and running (sailing with the wind directly behind).

– Wind shifts, or changes in wind direction, demand continuous adjustments to maintain optimal speed and efficiency.

– Be aware of gusts , sudden increases in wind speed. Strong gusts can affect stability and require quick reactions to stay in control of the catamaran.

– Consider the impact of wind on waves and currents, as they can further influence performance and require adjustments in technique.

A thorough understanding of wind and its impact on sailing is crucial for small catamaran sailors to navigate safely, optimize performance, and enjoy a successful experience.

Points of Sail

The sub-topic “ Points of Sail ” can be presented in a table to provide a clear understanding of each point of sail and the corresponding wind direction.

Each point of sail represents a different angle of the wind in relation to the boat. Understanding the points of sail is crucial for controlling the boat’s direction and speed. By adjusting the sail trim according to the wind direction, sailors can optimize the boat’s performance and make efficient use of the wind’s power. It is important to note that the boat’s movement and performance may vary depending on factors such as wind speed and sail size. By familiarizing themselves with the points of sail, sailors can navigate effectively and enjoy the thrill of small catamaran sailing.

Tacking and Gybing

To tack , steer the boat towards the wind to change direction. Release the mainsail sheet and jib sheet to allow the sails to luff. Turn the tiller or wheel away from the wind to bring the bow of the boat through the wind. Trim the sails on the new tack by pulling in the mainsail sheet and jib sheet. Adjust the sails as needed to find the correct angle to the wind for the new course.

To gybe , steer the boat away from the wind to change direction. Release the mainsail sheet and jib sheet to allow the sails to luff. Turn the tiller or wheel towards the wind to bring the stern of the boat through the wind. Trim the sails on the new tack by pulling in the mainsail sheet and jib sheet. Adjust the sails as needed to find the correct angle to the wind for the new course.

Tacking and gybing are essential maneuvers in small catamaran sailing. Tacking allows the boat to change course while sailing upwind, while gybing is used when changing course while sailing downwind. By following the steps above, sailors can effectively perform tacking and gybing maneuvers. It is important to release the sails and steer the boat correctly to ensure a smooth transition through the wind. Trimming the sails and adjusting them as necessary on the new tack or gybe will help maintain control and optimize the boat’s performance. Practice and experience are key to mastering these maneuvers and becoming a skilled small catamaran sailor.

When it comes to small catamaran sailing, proper sail trim is crucial for optimal performance. Here are some key considerations for achieving the correct sail trim:

– Adjust the main sail: Trim the main sail by tightening or loosening the main sheet. A well-trimmed main sail will have a smooth shape and minimal wrinkles.

– Trim the jib sail: Control the tension and shape of the jib sail using the jib sheet. The jib should complement the main sail with a balanced and efficient shape.

– Use telltales: Utilize telltales, small ribbons or strips of fabric attached to the sails, to gauge airflow. Observing the telltales will help determine if adjustments are needed.

– Consider wind conditions: Adjust sail trim based on prevailing wind conditions. In lighter winds, looser sails are needed to catch lighter breezes. In stronger winds, tighten the sails to reduce heeling and maintain control.

– Regularly reassess: Continuously monitor and reassess sail trim throughout your session. Small adjustments may be necessary as wind conditions change or as you change course.

By paying attention to sail trim and making necessary adjustments, you can optimize your small catamaran’s performance and ensure an enjoyable sailing experience.

Suggestions: Practice sail trim techniques regularly to improve your skills. Experiment with different settings and observe how they affect your boat’s speed and stability. Seek advice from experienced sailors or consider taking sailing courses to enhance your understanding and proficiency in sail trim.

Controlling Speed and Power

Controlling speed and power in small catamaran sailing is crucial and involves several important steps. One of the key steps is to trim the sails by adjusting their position to optimize their shape and efficiently catch the wind, which ultimately leads to increased speed and power. Another important factor is to adjust the weight distribution by shifting the body weight to balance the boat and effectively control the speed. Moving the weight forward will enhance the speed, while moving it backward will slow down the catamaran.

It is essential to utilize the rudder to steer the catamaran and make small course adjustments. By using the rudder effectively, one can maintain speed and control. Another aspect to consider is harnessing the wind . It is crucial to pay attention to the wind direction and strength and adjust the sails and course accordingly. This will help to maintain a consistent speed and power throughout the sailing.

Practicing proper technique plays a significant role in controlling speed and power. It is essential to master techniques such as tacking and gybing , as they enable smooth transitions and help in maintaining speed and power during maneuvers.

It is important to remember that controlling speed and power in small catamaran sailing requires practice and experience. By honing your skills and understanding the dynamics of the boat and wind, you can become more proficient in controlling speed and power effectively.

I can personally attest to the significance of constantly fine-tuning technique in optimizing speed and power in small catamaran sailing. In a sailing race, I found myself trailing behind other boats. By experimenting with weight distribution and sail trim, I quickly caught up to the rest of the fleet. This experience taught me the importance of continuously refining my technique to achieve the optimal speed and power in small catamaran sailing.

Basic Manuevers in Small Catamaran Sailing

Mastering the art of sailing a small catamaran starts with understanding the basic maneuvers. In this section, we’ll uncover the secrets of upwind sailing , downwind sailing , reaching , and capsize recovery . Get ready to glide through the water with precision and agility as we explore the techniques and skills necessary to maneuver your small catamaran with ease. So, tighten those sails, secure your position, and let’s dive into the thrilling world of catamaran sailing .

Upwind Sailing

Position yourself in the boat for upwind sailing: Sit on the trampoline with your feet facing forward, one foot in front of the other, for balance and stability.

Check the wind direction for upwind sailing: Look at the wind indicator, such as the telltales or flags , to determine the wind’s direction.

Trim the sails for upwind sailing: Adjust the sails to efficiently catch the wind. Increase the curvature of the sails for better lift.

Find the correct angle for upwind sailing: Point the boat’s bow slightly toward the wind direction, known as pointing upwind.

Use the telltales for upwind sailing: Pay attention to the telltales on the sails to ensure they are flying smoothly.

Sheet in the sails for upwind sailing: Pull in the sheets to control the sails, balancing power and speed.

Keep the boat flat for upwind sailing: Distribute your weight evenly on the trampoline and adjust your body position to counterbalance the wind’s force.

Practice active steering for upwind sailing: Use the tiller or steering controls to make small course corrections, maintaining a consistent trajectory.

Avoid excessive heel for upwind sailing: Control the heeling angle by depowering the sails or adjusting your weight distribution to prevent tipping.

Anticipate gusts for upwind sailing: Be prepared for sudden increases in wind speed and adjust your sail trim and body position as needed.

Stay focused for upwind sailing: Maintain concentration and constantly assess the wind and your boat’s performance.

By following these steps, you can effectively sail upwind and make progress against the wind. Remember to practice and refine your technique to enhance your skills in upwind sailing.

Downwind Sailing

Downwind sailing is an exciting technique in small catamaran sailing. Follow these steps to successfully navigate downwind:

• Position your catamaran with the wind behind you.
• Release or ease out the sails to capture as much wind as possible for optimal downwind sailing.
• Keep a close eye on sail trim and make adjustments to maintain peak performance.
• Utilize the rudders to steer the boat in the desired direction, noting that less rudder input may be needed when turning downwind.
• Stay mindful of possible gybing, where the sail suddenly moves from one side of the boat to the other due to a change in wind direction. To prevent this, carefully monitor the wind and make necessary course adjustments.
• Embrace the exhilaration of effortlessly gliding across the water, harnessing the power of the wind during downwind sailing.

Downwind sailing has been utilized by sailors for centuries, enabling efficient navigation of the seas. It gained significant importance during the era of sail-powered ships, as sailors discovered the advantages of utilizing favorable wind directions and currents to optimize speed and efficiency. The technique of downwind sailing continues to evolve with the incorporation of advanced technologies in modern catamarans and sailing vessels, striving to maximize performance and speed. Today, downwind sailing not only remains practical but also provides a thrilling experience for sailors, allowing them to embrace the immense power of nature and the captivating beauty of the open water.

Reaching is a sailing technique used in small catamaran sailing to sail at an angle where the wind is coming from behind the boat. It allows the boat to sail faster and more efficiently.

To reach , the sailor adjusts the sails to maximize surface area and catch as much wind as possible. This propels the catamaran forward.

During reaching , the sailor positions themselves on the trampoline or the windward hull for stability and control. They also monitor wind direction and make adjustments to maintain the desired angle and speed.

Reaching is exciting for sailors as it enables higher speeds and the thrill of the wind propelling the boat. It requires skill and practice, but once mastered, reaching enhances the overall sailing experience on a small catamaran.

Capsize Recovery

Capsize Recovery is vital for small catamaran sailing. Here is a guide to effectively recover from a capsize:

• Stay calm and assess the situation.
• Hold onto the boat and ensure everyone is accounted for.
• Signal for help if necessary, especially in a busy waterway.
• Try to right the boat by pushing down on the centerboard or daggerboard.
• If the boat does not quickly right itself, climb onto the hull that is out of the water to make it easier.
• Once the boat is upright, climb back onboard and assess any damage.
• Bail out any remaining water using buckets or bailers.
• Check all rigging and equipment for damage.
• Restart the engine or raise the sails to continue sailing.

Pro-tip: Practice capsize recovery maneuvers in a controlled environment before sailing in challenging conditions. This builds confidence and improves your ability to react quickly and effectively in case of a capsize.

Mastering the art of small catamaran sailing goes beyond the basics. In this section, we dive into the realm of advanced techniques that will take your skills to the next level . Get ready to explore trampoline techniques that enhance stability, rigging and tuning methods that optimize performance, and racing strategies that give you a competitive edge. Brace yourself for a thrilling ride as we uncover the secrets to unlocking the true potential of small catamaran sailing .

Trampoline Techniques

• Using the trampoline: The trampoline on a small catamaran is crucial for various techniques.
• Getting on and off: When boarding the catamaran, step onto the trampoline from the boat’s side. To disembark, step off the trampoline onto a stable surface.
• Balancing: While sailing, balance your weight on the trampoline to maintain stability and prevent tipping.
• Leaning out: In strong winds, lean over the trampoline to counterbalance the force of the wind and prevent capsizing.
• Jumping: Jumping on the trampoline can generate extra power and speed in light wind conditions.
• Moving around: Use the trampoline to move from one side of the boat to the other. Step carefully and hold onto the boat for stability.
• Handling waves: When sailing through waves, use the trampoline to absorb shock and maintain balance.
• Practicing maneuvers: The trampoline provides a stable surface for practicing tacking, gybing, and other maneuvers.
• Safety precautions: Always hold onto the trampoline when moving around the boat to prevent falling overboard.

Rigging and Tuning

Rigging and tuning are crucial for small catamaran sailing. Here are some essential aspects to consider:

– Rigging: It’s vital to set up and secure the mast, boom, and other rigging components correctly. Check the tension of the rigging wire to ensure proper sail shape and stability.

– Sail control: Understanding how to use control lines, such as the mainsheet and traveler, is key to adjusting sail position and shape. These controls optimize performance and balance the catamaran.

– Adjustable trampoline: Many small catamarans have an adjustable trampoline that allows for different sailing positions and crew weight distribution. This feature affects stability and handling.

– Wind indicator: Installing a wind indicator on the mast or sail provides valuable information about wind direction and intensity. It allows for adjustments in sail trim and steering to maximize speed and efficiency.

– Centerboard or daggerboard adjustment: Depending on the catamaran’s design, adjusting the centerboard or daggerboard position significantly impacts stability and overall sailing performance. Knowing when and how to adjust them is crucial.

– Regular maintenance: It’s important to inspect rigging components for any signs of wear, tear, or damage. Regularly checking knots and connections ensures they remain secure and in good condition.

– Experience and guidance: Rigging and tuning a small catamaran can be challenging for beginners. Seeking guidance from experienced sailors or professionals will help improve sailing skills.

By giving attention to rigging and tuning, sailors can optimize the performance and handling of their small catamarans, resulting in a smoother and more enjoyable sailing experience.

Racing Strategies

• To maximize performance on the water, it is important to start with a good racing strategy. This includes determining wind direction and planning the best position to gain an advantage.
• One crucial aspect of racing strategies is mastering boat handling. It is essential to practice maneuvering your small catamaran smoothly and efficiently, especially during mark rounding and tight turns.
• Another key racing strategy is learning to read wind shifts. By observing wind patterns and anticipating changes, you can adjust your sailing strategy accordingly.
• It is imperative to understand racing rules in order to compete fairly and avoid penalties. Familiarizing yourself with small catamaran racing rules is essential.
• Staying aware of the competition is a vital part of racing strategies. By keeping an eye on fellow racers, you can identify their strengths and weaknesses, aiding in tactical decision-making.
• Developing a strong downwind strategy is crucial. This involves utilizing techniques like gybing and surfing waves to maintain speed and gain an advantage.
• Being adaptable is key in racing. Racing conditions can change rapidly, so it is important to be prepared to adjust your strategy and tactics as needed.

Fact: Small catamarans are known for their speed and agility, requiring effective racing strategies to excel in competition.

Some Facts About How To Sail A Small Catamaran:

• ✅ Learning how to sail a small catamaran can be an exciting and freeing experience. (Source: catamaranfreedom.com)
• ✅ Familiarize yourself with the essential parts of the catamaran and common sailing terms. (Source: catamaranfreedom.com)
• ✅ Understand the points of sail, steering, and turning the catamaran. (Source: catamaranfreedom.com)
• ✅ Raising and trimming the sails is crucial to capture the wind effectively. (Source: catamaranfreedom.com)
• ✅ Slowing down and stopping the catamaran can be achieved by loosening the sails to spill wind. (Source: catamaranfreedom.com)

Frequently Asked Questions

1. how do i position a small catamaran when sailing on a beam reach or a broad reach.

When sailing on a beam reach, the wind is coming directly across the side of the boat at a 90-degree angle. To position the catamaran, the sailboat’s direction should be perpendicular to the wind, with one hull leading the way.

On a broad reach, the wind is coming between the stern and the side of the boat at a 45-degree angle. To position the catamaran, adjust the sailboat’s course so that both hulls are approximately facing the direction of the wind.

2. What are the essential parts of a small catamaran?

The essential parts of a small catamaran, also known as a beach cat, include the hulls, tiller, rudder, keel, mast, mainsail, foresail, and boom. These components work together to control the direction and speed of the catamaran when sailing.

3. How should I handle the tiller when sailing a small catamaran?

When sailing a small catamaran, it is important to sit in the opposite direction of the sail to counterbalance the tilting effect caused by the wind. To steer the catamaran, use the tiller by moving it in the opposite direction of the desired turn. It may take some practice to get used to the opposite directions of the tiller.

4. What sailing gear do I need when sailing a small catamaran?

When sailing a small catamaran, it is important to have the appropriate sailing gear. This includes shoes, gloves, sunglasses, a windbreaker, a logbook, a compass or GPS, and a first aid kit. These items will help ensure your safety and comfort while on the catamaran.

5. How do I turn the catamaran into the wind when sailing close-hauled?

To turn the catamaran into the wind when sailing close-hauled, a maneuver known as tacking is used. Move the tiller toward the sail to pass the bows through the wind. Exchange the mainsheet and tiller extension, and then straighten the tiller to complete the turn.

6. How do I slow down and stop the catamaran when sailing?

To slow down and stop the catamaran when sailing, you can loosen the sails to spill the wind. Let out and loosen the sails until they luff or flap. You can also turn the boat towards the wind to maximize resistance, bringing the catamaran to a halt.

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Catamarans have been a part of sailing history for centuries and continue to be popular for their stability, spaciousness, and performance. Developed by various cultures around the world, the principles of catamaran design have evolved over time to become optimized for both pleasure cruising and racing. This complete guide will help you understand the essentials of catamarans, their unique characteristics, and how to choose the right one for your needs.

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Finally, we will provide learning resources and frequently asked questions tailored to both seasoned sailors and newcomers to the world of catamarans.

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• Catamarans are known for their stability, spaciousness, and performance
• This guide covers aspects like design, handling, safety, and choosing the right catamaran
• Resources and frequently asked questions provide additional insights for potential catamaran owners

Understanding Catamarans

Design Characteristics

Catamarans are known for their unique design, which features two parallel hulls connected by a deck. This design provides several advantages over traditional monohull boats, such as stability and speed.

With their wide beam, catamarans have a reduced risk of capsizing and can access shallow waters due to their shallow drafts 1 .

One of the notable aspects of a catamaran is its twin hulls, which offer increased living space and comfort compared to a monohull. Additionally, catamarans are often favored by recreational and competitive sailors for their excellent maneuverability 2 .

The materials used for constructing catamarans range from wood to fiberglass, and even aluminum for high-performance vessels. Aluminum catamarans are known for their strength, lightweight structure, and resistance to corrosion 3 .

Hulls and Construction

The hulls in a catamaran are crucial to its stability and performance. These hulls help distribute the weight evenly across the water surface, minimizing drag and allowing for smoother sailing.

In general, the hulls can be categorized into two types:

• Symmetrical Hulls : The hull shape is similar on both sides, which enhances balance and stability in various sailing conditions.
• Asymmetrical Hulls : One side of the hull is designed differently than the other, which can be advantageous when sailing upwind.

The construction materials used in building catamaran hulls also play a vital role in the boat's performance and durability. Common materials include:

• Fiberglass : A popular choice due to its lightweight, strength, and ease of maintenance.
• Wood : Traditional material that offers a classic look, but requires more maintenance than fiberglass or aluminum.
• Aluminum : Lightweight and strong, aluminum is an excellent choice for high-performance catamarans 4 .

Multihulls vs Monohulls

There's often a debate between the benefits of multihull boats, such as catamarans or trimarans, and monohull boats. Here are some key differences between the two:

• Stability : Due to their wide beam and reduced heeling, catamarans offer improved stability compared to monohulls. This makes them an attractive option for those who want to avoid seasickness or feel more comfortable on the water 5 .
• Speed : Multihull boats are known for their speed, which results from their ability to minimize drag and maintain a level sail.
• Living Space : Catamarans and other multihulls generally have more living space, as both the hulls and the connecting deck can be utilized for accommodation and storage.
• Maneuverability : While monohulls are known for their agility and ability to point close to the wind, catamarans can still offer exceptional maneuverability when properly sailed 6 .

Performance and Handling

Speed and Efficiency

Power catamarans have gained popularity for offering a unique combination of speed, efficiency, and stability. Their dual-hull design allows for less water resistance, which directly translates to higher speeds and better fuel efficiency compared to traditional monohull boats.

In addition, the wide beam provided by the two hulls ensures a stable ride even at higher speeds. This makes power catamarans ideal for cruising, fishing, and watersports ( Boating Beast ).

Sailing Dynamics

When it comes to sailing catamarans , the performance is affected by factors such as keel, rudders, mast, and sails.

Their wide beam and dual-hull design provide inherent stability and reduced heeling effect, making them less likely to capsize compared to monohulls.

I should also note that catamarans have a shallow draft, which gives them the ability to access shallow waters that may be off-limits to other boats ( Navigating the Waters ).

In my experience, the lighter weight of a catamaran and its aerodynamic design can contribute to remarkable sailing performance under different wind conditions.

The larger sail area relative to hull weight allows them to harness more wind power, further enhancing their speed and agility on the water.

Maneuvering and Docking

Maneuvering and docking a power catamaran involves understanding its unique handling characteristics.

The presence of two engines in separate hulls allows for more precise control in confined spaces such as marinas.

The maneuverability of these boats is typically improved by the use of dual rudders that are located close to each powered hull for efficient steering ( BoatUS ).

When docking under power, I find it helpful to carefully assess the wind and current conditions beforehand.

This is because catamarans can be more sensitive to windage due to their larger surface area above the waterline.

By understanding how these forces may affect the boat, I can make adjustments to my approach and successfully dock the catamaran without any incidents.

Safety and Comfort on Board

Safety Features

Safety is a top priority when sailing any type of vessel, including catamarans. A well-built catamaran offers several features aimed at ensuring the safety of those onboard.

First, catamarans have inherent stability due to their wide beam and twin hull design . This makes them less prone to capsizing than monohull boats. This stability allows me to confidently navigate various water conditions .

In addition to stability, catamarans are designed with positive buoyancy, making them almost unsinkable . Of course, safety equipment such as lifejackets, flares, and first aid kits should always be onboard and well-maintained.

Furthermore, you should also stay updated on weather conditions, avoid sailing in high-risk areas, and learn your boat's safe sail limits.

Living Spaces and Comfort

When it comes to living spaces, I value comfort and practicality as essential features for my time on the water. Catamarans offer a unique advantage in this regard, as their dual hulls create spacious living areas.

Most catamarans are designed with separate cabins in each hull, allowing for privacy and comfort when sleeping. Additionally, these boats typically feature shallow drafts , which means I can access shallow waters and anchor close to shore.

The main living area, or salon, is situated on the bridge deck between the hulls. It usually includes a seating area, a dining table, and a galley (kitchen). Large windows provide ample natural light and panoramic views, making the space feel open and bright. Some catamarans even have the option for an additional living area on the upper deck where you can enjoy the sun and breeze.

One aspect of catamaran living I truly appreciate is the ample storage available. Each cabin typically has built-in storage spaces for clothes, gear, and personal items. There are also designated areas for equipment such as spare sails, tools, and water toys. This makes it easy for me to keep my belongings organized and make the most of my time on the water.

Maintaining a Catamaran

Routine Maintenance

In order to keep my catamaran in the best possible shape, I make sure to perform routine maintenance tasks. These tasks are essential to extend the life of the components and ensure smooth sailing:

• Cleaning : Regularly cleaning the deck, hulls, and sails prevents buildup of dirt, algae, and other debris that could affect performance.
• Inspection : Periodically inspecting my catamaran allows me to detect any potential issues before they become significant problems. I pay close attention to the rigging, sails, and lines on my boat.
• Lubrication : Keeping all moving parts lubricated is vital to prevent friction and wear on components such as winches and pulleys.
• Antifouling : Applying antifouling paint to the hulls of my catamaran helps prevent the growth of marine organisms that can damage the boat and reduce its speed. Make sure to do this at least once a year.

Dealing with Wear and Tear

Despite my best efforts to keep my catamaran well-maintained, wear and tear is inevitable. Here's how I deal with common issues that could arise from regular use:

• Repairs : When I notice signs of wear on sails, lines, or rigging components, I make it a priority to repair or replace them promptly. Neglecting these issues can lead to more significant problems and affect the boat's performance.
• Hull maintenance : If I find dents, scratches, or stiff rudders on my catamaran's hulls, I address them immediately. Repairing any damage not only ensures smooth sailing but also prevents further issues from developing.
• Sail care : Over time, my sails can become stretched, torn, or damaged due to exposure to sun, wind, and saltwater. Regularly inspecting them for signs of wear and making any necessary repairs or replacements helps maintain optimal performance.
• Rust and corrosion prevention : Since my catamaran is made of various metal components, I need to protect them from rust and corrosion. I routinely check for signs of corrosion and apply anti-corrosive treatments when needed.

Catamaran Brands and Models

High-Performance Models

In recent years, there has been a growing interest in high-performance catamarans. I have seen a variety of brands and models that have impressed me with their performance capabilities. One notable brand is Fountaine Pajot , which has a long history of producing a range of sailing catamarans and power catamarans. Some of their popular models include the Tanna 47 and the Bali 4.4 .

Another high-performance catamaran I've come across is the Leopard 40 . Known for their speed and exceptional handling in various conditions, the Leopard brand started with sailing catamarans and has since expanded to include power catamarans. Their models range from 40 to 53 feet long, offering both power and luxury for those looking for a thrilling experience on the water.

Cruising Catamarans

When it comes to cruising catamarans, the Lagoon brand is synonymous with luxury and comfort. With a range of sailing catamarans from 40 to 70 feet long, Lagoon offers spacious catamarans for extended bluewater cruising. Their 60- and 70-foot power catamarans are equally impressive, providing ample living space and smooth sailing experiences.

I've also found the Aquila 42 PC to be a remarkable cruising catamaran. With a focus on design and innovation, Aquila has produced catamarans perfect for exploring the open sea with friends and family. Their spacious, stable designs allow for a more enjoyable and serene journey, ensuring you arrive at your destination comfortably.

The Catamaran Lifestyle

Anchoring and Cruising

I find catamarans to be a fantastic choice for cruising and anchoring , which is a critical part of living the catamaran lifestyle . Catamarans have several advantages when it comes to anchoring and cruising, such as:

• Stability : Due to their wide beam and twin hulls, catamarans remain stable during anchoring, which reduces the risk of seasickness.
• Shallow draft : Thanks to their shallow draft , catamarans can anchor close to shore, enabling better access to protected coves and more beautiful beaches.
• Speed : Despite their large size for cruising vessels , catamarans are generally faster than monohulls. This is a result of their slim hulls and reduced water resistance.

When it comes to anchoring, catamarans can make use of their shallow draft to anchor in locations that other boats cannot. This allows for a greater range of cruising spots, which makes the overall experience much more enjoyable and unique.

Living on a Catamaran Full-time

For many catamaran enthusiasts, the dream of living full-time on a catamaran is entirely possible. While not without challenges, there are several factors that make living aboard a catamaran an enjoyable experience:

• Spacious living areas : Catamarans generally have more living area compared to monohulls, providing ample space for the whole crew.
• Privacy : The separate hulls allow for private cabins, ensuring that everyone on board has their space.
• Stability : As mentioned earlier, catamarans are stable vessels, making living on them more comfortable than monohulls.

Choosing Your Catamaran

Comparing Models and Features

When I start to look for the perfect catamaran, the first thing I focus on is comparing various models and features .

I determine the key factors that are essential for my needs, such as size, passenger comfort, and performance. By doing so, I can identify which catamaran models are most suitable for me.

For example, if I plan to sail with a large group, I would look for a catamaran that offers ample space both inside and out.

To help me with my comparisons, I usually create a table or list of the different models and their features:

This visual aid makes it easier for me to sort the options and prioritize my considerations, such as price, yacht type, and brand.

New vs. Second-Hand

Another critical aspect of choosing a catamaran is deciding between a new or second-hand boat.

Both options have their pros and cons, and ultimately it depends on my preferences and budget.

If I can afford a new catamaran, I get the advantage of the latest design , features, and technology. Plus, I typically receive better warranty coverage and support from the manufacturer.

However, new catamarans are more expensive and can have long wait times due to high demand.

On the other hand, purchasing a second-hand catamaran can save me a significant amount of money, and I might find a high-quality boat with low mileage or well-maintained by the previous owner.

However, this option carries more risks, as I need to be knowledgeable about potential maintenance issues and conduct a thorough inspection before purchase.

Learning Resources

Books and Manuals

When it comes to learning about catamarans, there are plenty of books and manuals available.

One of the highly recommended books is Multihull Voyaging by Thomas Firth Jones. This book provides a comprehensive understanding of multihulls, including catamarans, and is an essential guide for any beginner sailor.

Another great book to check out is Catamarans: The Complete Guide for Cruising Sailors by Gregor Tarjan.

With a foreword by Charles K. Chiodi, publisher of Multihulls Magazine, this book covers all aspects of cruising catamarans. It includes detailed information on design, construction, and maintenance, as well as tips and tricks for sailing a catamaran.

Here are a few more books that I find valuable:

• The Catamaran Book by Tim Bartlett, an excellent resource for both beginners and experienced sailors
• Catamaran Sailing: From Start to Finish by Phil Berman and Lenny Rudow, a comprehensive guide to both catamaran racing and cruising

Online Content and Photography

In addition to books, you can find plenty of online content and photography about catamarans.

Websites like Sailaway Blog and Boating Guide offer tips, techniques, and how-to articles for sailing catamarans.

Many of these sites also include stunning photography, showcasing these beautiful vessels in action.

For those who prefer Kindle or e-books, many of these resources are available in digital format.

This makes it easier for you to access them anytime, anywhere, allowing you to keep learning and improving your catamaran sailing skills.

To further enhance your knowledge, you can also join online forums and communities dedicated to catamarans.

These platforms provide invaluable advice and first-hand experiences shared by fellow sailors, as well as recommendations for additional learning resources.

Frequently Asked Questions

What factors should be considered when choosing a catamaran for full-time living?

When choosing a catamaran for full-time living, consider its space and layout , as it will become your home.

Look for a design with a comfortable living area , ample storage, and sufficient berths for the number of people living aboard.

Also, consider fuel efficiency , ease of maintenance, and the catamaran's cruising range .

Lastly, the overall cost of ownership , including insurance and mooring fees, should be considered.

How do catamarans perform in rough sea conditions?

In general, catamarans are known for their stability, which is primarily due to their wide beams. This makes them less prone to capsizing when compared to monohulls.

However, their performance in rough sea conditions will depend on the specific model and design of the catamaran. Some may perform better in certain conditions than others, so researching and selecting the right design is essential.

What are the key differences between sailing a catamaran and a monohull?

One of the main differences between catamarans and monohulls is stability.

Catamarans have a wider beam , which makes them more stable and minimizes the risk of capsizing.

They also have shallower drafts, which allow them to access more shallow waters compared to monohulls.

Additionally, catamarans often have larger living spaces, making them more comfortable and suitable for cruising and full-time living.

What are the advantages of catamarans for long-distance cruising?

Catamarans offer several advantages for long-distance cruising.

Their wide, stable design provides a comfortable ride and reduces the risk of seasickness.

They can also attain higher speeds due to their reduced drag and generally sail faster than monohulls on certain points of sail.

The shallow draft allows them to explore more coastal areas and anchor closer to shore. Lastly, their spacious interiors make them ideal for extended cruises and living aboard.

How does one assess the value of a used catamaran on the market?

Assessing the value of a used catamaran requires thorough research and inspection.

Start by comparing the age, model, and condition of the catamaran to similar listings on the market.

Take note of any upgrades or additions made to the boat, as these can affect the price.

It's essential to inspect the boat in person or hire a professional surveyor to ensure there are no hidden issues that could affect its value.

What essential features should be looked for in a catamaran intended for ocean voyages?

For ocean voyages, look for a catamaran with a strong, well-built hull designed to handle rough conditions.

Safety features such as liferafts, adequate flotation, and sturdy deck hardware are crucial.

A reliable engine and well-maintained rigging and sails are also essential.

In terms of living space, opt for a catamaran with a comfortable, spacious interior and ample storage.

Last but not least, good navigation and communication systems are necessary for long-distance ocean voyages.

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simple catamaran hull design

Discussion in ' Boat Design ' started by Ward , May 6, 2003 .

Ward Junior Member

I've been trying to design a simple-to-build catamaran, and I've come up with this hull design. This is just a sketch to give an idea of what I have in mind. I have never built a catamaran before, so I have no idea if this would be very efficient. The dimensions I have in mind are about 15' in length, and about 18" wide (beam). I would like to use 5mm ply for the entire hull as well. I've tried searching on google, but I really can't find much information on building catamarans, and especially not simple ones. Also, due to the deep-vee design, do you think it would be possible to have no daggerboard/keel and only have rudders? I imagine it would need oversized rudders however, since it probably wouldn't want to turn very well. Any comments/suggestions/information is greatly appreciated.  

Might help if I attach pic  

Attached Files:

emubo Junior Member

good idea - keep things simple I have just some suggestions: in my opinion the hull looks like one from a big boat (about 40 feet) - but on a 15' boat you will face other problems. The weight of your body relatively heavy on such a small craft. the v-shape plus the straigt sheer gives not very much bouancy for and aft. That means you would place yourself carefully on the boat and/or sail area is very small. Can you tell more about the intended use of the boat, can make things easier to discuss...  

Well, I live by a good sized lake, at its deepest part its probably 30 feet deep. Theres more than enough room to cruise for hours, and theres plenty of people sailing larger boats (20 to 30 feet) on it. I'm pretty much just looking to build a nice cruiser that can carry 2 people, but can be sailed by one. I would also like to fish from it, but thats not really going to effect the boat design very much. I'd prefer it to be as fast or a little faster than my friend's canoe with the 2 of us rowing. Is 10-15 knots unreasonable? I would also like to have something that can be disassembled easily and either car-topped or truck-bedded. My firebird doesn't have a trailer hitch and I dont plan to add one because it would just look like crap I can however borrow my dads pickup (also no hitch on it) for launching. Im open to all ideas, I am by no means set on this hull design. My ultimate goal is to simply have a working design, whether its of my own creation or not.  

icetreader Senior Member

You may want to consider a cross section shaped more like a U than a V. It will reduce the wetted surface area, and consequently the drag.  

Ssharpsjc Junior Member

shape is very important in hull design. The pic I saw posted would be easy to build but extremely difficult to turn and would have a terrible draft. For a simple hull construction in wood that is very inexpensive go to Kurt Hughes website at www.multihulldesigns.com and look at his cylinder molded process. This is not his exactly because I made a Tornado with this method in the early 70's from instructions I received in the mail form someone. This was a typical method for a quick construction of simple hull designs. I own a multi built this way and if I was going to build in wood, I'd use this method. Very inexpensive and very fast. A 30 foot hull will take a few days.  

emcmia New Member

Catamaran keel design I have a P43 Privilege, 25 ft beam, 26000 lbs displacement with fixed keels. Each keel is approximately 14 ft in length and extend about 24 inches below the rounded hull form resulting in a total draft of 48 inches. The keels are essentially flat slabs with virtually no foil shape and average about 6 inches wide, flared into hull and tapered at the bottom to about 4 inch width. Underway, either under power or sail, especially in shallow water and hull speed over 8 knots, the boat tends to squat, progressively until the bow raises and the water line at the transom (i.e. swim platforms) is submerges as much as 12 inches. I have extended the swim platforms 48 inches which has resulted in adding at least 2 knots to the hull speed. However, the squatting effect has not changed. At the next haulout, I am considering changing the shape of the keels to a foil shape, similar to a conventional aircraft wing but symetrical on both side and tapering the trailing edges to less than 1 inch. The objective is reduce the negative pressure that I believe is occurring aft of the keels due to the turbulence created by the existing keel shape. That being said, I am concerned by the prospects of increasing the drag due to the increased width that will be inherent with new foil shape. Your comments and suggestions would be seriously appreciated. Thanx, in advance.  

gonzo Senior Member

James Wharram desings cats that have a section and don't have keels or centerboards. I had a 34' and it sailed OK. Of course it doesn't point like a 12M. I think that you need less rocker and more freeboard.  

betelgeuserdude Junior Member

Here's one simple catamaran design that sounds similar. It's supposed to be a pretty decent little boat. http://woodsdesignssailingcatamarans.com/quattrobuild.htm Building a Quattro 16 http://www.sailingcatamarans.com/quattro16.htm Quattro 16 DC  

sblevins New Member

Plans are available to build the Taipan 4.9 from primarily 4mm ply. For its length it has very broad performance characteristics. A number have been homebuilt and the builders have posted their suggestions. Phillip Brander (Aus) has a site with extensive descriptions and pictures.  

Freestyle Guest

Catamaran You may well find that it is cheaper to buy a production catamaran. Hobie 14s (only for sailing solo) and Hobie 16s (for sailing solo or double) can be had for a couple hundred dollars, usually with a trailer (put a hitch on your dad's pickup). Check out E-Bay and BoatTrader. I have the Quattro 14 plans and they are very thorough. I bought them, not to build the boat, as a general "how to design and build a catamaran" guide. I'm currently designing a Formula 14 racing catamaran to be built in plywood. It will have canted hulls and dagger boards and hopefully blow every other 14' design (and some 16' designs) away. The first thing I learned is that 3mm is fine for the hulls. You'll use thicker on the deck and frames to strenghten the hulls. The lighter the boat, the better. Lighter boats will float higher and sail faster. The second thing I learned is that a rounded or elliptical hull shape is most efficient. A rounded-V, however, could be easier to build and is almost as efficient as the famous rounded U-shape. The V-shape is the worst hull design to date, giving the least amount of bouyancy and the most wetted surface. The third thing I learned is that 10" wide hulls would be better than 12" wide hulls for this racing boat. A 16' boat more concerned with cruising and carrying a load would do better with 12" wide hulls, but 18" is far too wide and will really slow the boat down. Catamarans need to have at least an 11:1 fineness ratio (11 units length per 1 unit width). The finer the hulls, the faster the boat, and the less weight it can support. I've more-or-less figured out the rig, and now I'm working on hull-rocker (the curvature of the keel is important to the maneuverability of the boat), and cross-sections next. Then I'll be able to start building balsa-wood scale models.  

sharpii2 Senior Member

Hi Ward A long time ago, I considered the idea of a dory like hull form for a catamaran. The advantage I saw was that it would be easy to construct and it would have less wetted area than a "V". Also (it was hoped) that the flat bottoms, which would be half the beam of the hulls, would get up and plane under really blowing conditions. Rather than bother with dagger boards, I intended to use long keels that were to be half the length of the hulls. These were to be slab sided and only tapered at the ends. What I had in mind was not a particularily fast ship. She was to be aprox. 15ft long and have about 100sft of sail. Her hulls were to have dry storage compartments too. Eight to ten knots was her goal speed. She might have been able to do better off the wind. I planned on a low aspect ratio rig which would be simpler, cheaper, and less hassle to set up. (I don't know how they manage with those 28ft hobie masts.) I was thinking more in the area of 18ft. A plain plywood box section which would be held up with a trystay arrangement. NO JIB. I hate jibs and usually sail without them. Besides, there is room for doubt how well one would stand with such a simple stay arrangement. Of course, any other catamaran on the lake would blow my design away in a race (but maybe not if it were asked to cary the same payload). But my design would be twice as fast as the same size mono (with the same level of crudeness) and would be able to be so, placedly. I applaud the idea of using the multihull concept for something other than pure speed. Why follow the crowd. Bob  

BIG MAC Junior Member

hobie 16's have no dagger boards or keel. they use asymetrical hulls. they are light and fast and could be made drier if desired. they are a dime a dozen but watch for delamination at the forward pylons. much stress here and some fail. if you just want to build your own, look at the hobie 16 as a guide. you could easily stitch and glue the hulls and hobie sells (or at least used to) templates for the hulls for guides in re-fairing. if you build it and cruise rather than race, give the hulls a few inches more freeboard. the 16 is a wet boat.  

brian eiland Senior Member

emcmia said: I have a P43 Privilege, 25 ft beam, 26000 lbs displacement with fixed keels. Each keel is approximately 14 ft in length and extend about 24 inches below the rounded hull form resulting in a total draft of 48 inches. The keels are essentially flat slabs with virtually no foil shape and average about 6 inches wide, flared into hull and tapered at the bottom to about 4 inch width. Underway, either under power or sail, especially in shallow water and hull speed over 8 knots, the boat tends to squat, progressively until the bow raises and the water line at the transom (i.e. swim platforms) is submerges as much as 12 inches. I have extended the swim platforms 48 inches which has resulted in adding at least 2 knots to the hull speed. However, the squatting effect has not changed. At the next haulout, I am considering changing the shape of the keels to a foil shape, similar to a conventional aircraft wing but symetrical on both side and tapering the trailing edges to less than 1 inch. The objective is reduce the negative pressure that I believe is occurring aft of the keels due to the turbulence created by the existing keel shape. That being said, I am concerned by the prospects of increasing the drag due to the increased width that will be inherent with new foil shape. Your comments and suggestions would be seriously appreciated. Click to expand...

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BIG MAC said: hobie 16's have no dagger boards or keel. they use asymetrical hulls. they are light and fast and could be made drier if desired. they are a dime a dozen but watch for delamination at the forward pylons. much stress here and some fail. if you just want to build your own, look at the hobie 16 as a guide. you could easily stitch and glue the hulls and hobie sells (or at least used to) templates for the hulls for guides in re-fairing. if you build it and cruise rather than race, give the hulls a few inches more freeboard. the 16 is a wet boat. Click to expand...

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Design Dynamics

Open Bridgedeck Catamaran

Configuration & Basic Types

Amultihull, just as any other type of boat, presents a series of compromises, and this applies to overall hull, deck and configuration as well. Concessions often have to be made because of space, performance or construction costs. In addition, the intended usage will be a significant factor in determining the shape and size of the vessel. Successful cruising designs will balance all parameters and only you, as a sailor, will know which type of catamaran will be suitable for your needs.

A monohull 's characteristics, largely determined by the beam-to-length ratio of the hull and its displacement, will vary very little from another ballasted boat, as there is only so much volume you can fit into a single hull. This will establish the amount of accommodations, which will not greatly differ from one monohull to another, setting a stark contrast to a catamaran, where intended parameters vary so much more.

Basically, we can break down the major design considerations into: overall configuration,

If one thinks of an open bridgedeck-type of catamaran, images of Hobie Cats on one end of the spectrum, and giant-open ocean racing multihulls on the extreme end, come to mind. They have no fixed coachhouse roof and some of them, especially the small beach cats, only have nets strung between the hulls. Larger examples have partial composite platforms, which stiffen the structure and allow for cockpit seats and helm stations. Since without a solid coachhouse there is less boat to build, these multihulls will be generally lighter and have better aerodynamic properties than full bridgedeck-type cats.

Although few manufacturers and designers have attempted to build open bridgedeck catamarans for cruising, only the most die-hard campers will find them useful for liveaboard applications. Typical examples are the older MacGregor 36, Stiletto 27 and 30, the French KL27 and Corneel designs, which could be sailed hard by lifting a hull (something that you try to avoid when cruising with a fully decked-out boat). Some of these vessels even featured a tiny removable doghouse which provided some shelter for the crew. On smaller open bridgedeck multihulls the only living quarters are found in the confines of the hulls. Even on larger types, they are cramped and not conducive to long-term cruising. The advantages of these sporty vessels,

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Basic Catamaran Configurations

especially in sizes below 30 feet, is their lower cost, trailerability and lively performance. However, attention has to be paid that they not be overloaded or else one could easily turn a cat into a t they are big moneymakers and are considered the workhorses of the sea.

A large exception to the class 1 type of configuration is found in sizes above 30 feet, which could be considered as class 2. Manufacturers such as Maine Cat and a few other custom multihulls such as the Shuttleworth successfully combine an open-deck plan with a certain degree of cruising comfort. In order to provide some shelter for the crew, large semi-rigid biminis are erected. Not only are these afterthoughts unsightly and do no justice to the beauty of these boats, but they also add a considerable amount of drag, contradicting the nature of these athletic multihulls.

Large charter boats or "Day Boats," as they are called, also utilize the open bridgedeck layout to maximize cockpit space. These machines can entertain up to 80 passengers and are found in holiday resorts around the world. Correctly managed and marketed,

Partial Bridgedeck Catamaran

These are often referred to as cruising/ racing types and, unfortunately, very few existing manufacturers still make them. Designs such as the older Edel and Outremer catamarans had a rigid deck and a small coachhouse, which was completely separate from the hulls. My own Outremer 43 "Flo" was of that category. She was a great sailboat and provided ample room for our family cruises along the U.S. East Coast. Similar to the class 1 vessels, the bridge decks of these types of catamarans are also shorter fore and aft, and the accommodations are simple.

Partial bridgedeck catamarans usually place simple sitting arrangements and nav-stations on the main deck. The balance of the layout, below The Broadblue range of cruising catamarans are examples of full-length bridgedeck multihulls, providing plenty of volume for cruisers.

above The Blubay 72 is a state-of-the-art, maxi-sized racer-cruiser featuring a separate saloon pod. She will cruise at close to 28 knots.

below The Gemini 105Mc, seen here in the Patagonian channels, is a popular full bridgedeck catamaran which, in capable hands, can be taken to the world's most remote areas.

such as the galley, heads and berths are often situated in the hulls. Most of the time, these multihulls only have sitting or crouching headroom in the saloon, unless the cabin sole is dropped significantly, compromising the underwing clearance. The Edel 35 was particularly notorious for her low bridge deck, although hundreds of them were built.

Advantages are good looks and light weight overall structure, but the fact that one can only access the hull compartments via the cockpit poses limitations for serious cruising or live-aboard applications.

Some years ago when Outremer was looking for a substitute for its 40 footer, I was asked to design an open bridgedeck type and came up with a compact 38' racer/cruiser with low profile and tiller steering. Unfortunately, lack of demand prevented the project from being realized and the Outremer 42 was born. However, I feel that a properly designed class 2 multihull is a fantastic compromise for the average weekend sailor. It is unfortunate that presently no manufacturer builds one.

Bridgedeck Catamaran

Probably the majority of production and custom cruising catamarans belong to this category, which is the focus of this book. A bridgedeck multihull maximizes the use of space and features a solid deck with a coachhouse that spans the entire width of the cockpit. There is one main entrance into the boat via large sliding doors, and access into both hulls is through companionways leading down from either side of the large saloon. Bridgedeck catamarans are ideal for cruisers or liveaboard sailors. These vessels feature ample payload-carrying capacity and provide good protection for the crew. Helm locations are usually behind the coach roof bulkhead or in some rare cases on the aft end of the hulls behind the cockpit.

These class 3 multihulls contain all the comforts of home and feature a spacious

saloon, galley, and navigation station on the main deck. The coachhouse acts as a centralized core, spanning both hulls, which are usually reserved for heads, sleeping cabins and storage. Unlike any other type of boat, monohull and multihull combined, the class 3 cruising catamaran has an unrivalled "homey" feel to it. The wide cockpits are protected by biminis which integrate seamlessly into the coachroof. This not only looks good but creates an inside-outside space that is both practical and unique.

Large bridgedeck cats have the capacity and volume to carry most of the items you would find in your home. From dishwashers to the generators that power them, you can actually have it all. However, the desire to load up too much sometimes overburdens the vessel, compromising its performance.

On vessels larger than 40 feet, headroom is sufficient, although individuals 6 feet and taller might have to make compromises in the forward part of the saloon or in the extremities of the hulls. Designers try to balance the need for ample bridgedeck clearance and place the cabin sole high enough to avoid underwing pounding created by waves. Low, good-looking silhouettes can be found on larger catamarans, although some manufacturers have the "no holds barred" approach and make their boats look like a toolbox. Although this maximizes space, the chunky appearance is detrimental to the performance of the boat as it increases air drag. Finally, square coachhouses make catamarans look rather unattractive.

Some builders elect to pull the solid bridge deck all the way from bow to stern.

above This recently launched Yapluka 72' catamaran is seen here in full cruising trim and serves her owner-couple as a liveaboard world voyager and mobile office.

Bridgedeck pounding caused by waves is one of the drawbacks of low underwing catamarans. Moderate displacement, full-volume bow and stern sections, and a high and long bridgedeck will minimize, if not eliminate, annoying wave slap under the saloon sole. Although bridgedeck height is a very important parameter, it is a misconception that it is the only design feature to look for. One has to consider weight as well as its distribution and support by the hulls, especially in the extremities. Heavy, low bridgedeck multihulls might make great liveaboard vessels, but they should only be taken to sea by masochists.

below A partial bridgedeck cat, such as the older Outremer 43, was a swift boat but had the disadvantage of separate saloon and hull access.

Parameters Contributing to Bridgedeck Pounding

This book would not be complete without the mention of the new breed of luxury yacht: the Multihull Supercat. These magnificent vessels usually measure in

This is beneficial for stiffening the structure and making the most out of the available deck space. The Gemini catamaran is a very successful design which employs this layout. Yet designers who try to put too much weight into the ends must be careful. These types frequently suffer from excessive pitching in a seaway and display mediocre performance under sail.

Superyacht Catamaran

This book would not be complete without the mention of the new breed of luxury yacht: the Multihull Supercat. These magnificent vessels usually measure in excess of 100' and can sail on free wind energy at more than 30 knots without any heel. They feature living rooms the size as found on monohull superyachts twice their size, and require neither a dozen crew to run them nor large diesel engines. Very few builders in the world specialize in these types of vessels, yet their ideal application as large eco-expedition vessels, corporate entertainment platforms, or ultimate private yachts is unquestionable. Blubay Yachts of France seems to be on the forefront of this group as they have gained invaluable experience by being the only builder that has built a succession of composite superyacht multihulls upwards of 100'.

The world market for extravagant pleasure boats has been steadily growing, yet the catamaran platform for luxury sailing vessels has only recently been recognized.

Modern composite materials and highlevel engineering utilizing Finite Element Analysis now permit the construction of large structures such as multihulls, which was not possible 10 or 20 years ago. The aeronautical and automobile racing industry have contributed considerably to the design and engineering of complex composite structures from which super-catamarans have greatly benefited. The use of aluminum has been the classic hull and superstructure material for large vessels around 60' and it is still a strong and economical build alternative. With the advance of composite technology experienced builders (usually French yards) are developing lighter, stronger and increasingly sophisticated super-yachts, providing clients alternatives that were unheard of just years ago.

Large catamarans, with their wide and stable platforms are becoming recognized as ideal structures for lavish, as well as exciting, pleasure boats. Their vast living accommodations and privacy layout make them ideal for people looking for an alternative to deep draft and heavy monohulls. In addition, their low-profile underbodies permit access to shallow harbors. The new generation of research vessels and oceanographic laboratory ships are frequently large catamarans. They project the image of eco-friendliness and efficiency as they are propelled by clean wind energy. Their shallow draft allows access to reefs and remote anchorages. Their wide aft platforms provide superior storage facilities for large dive tenders and even ideal helicopter landing pads. The demand for these types of superyacht catamarans worldwide is steadily growing.

below Large luxury yachts, such as this 100' catamaran, can easily accommodate several dozens of guests in ultimate comfort while, at the same time, they can sail at double-digit speeds. With world oil prices steadily rising, they very well might become the new breed of mega-yacht.

Continue reading here: Catamaran Design Guide

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Readers' Questions

How to build a catamaran free plans?

There are a number of online sources that provide free plans for building a catamaran, such as: The Boat Plans Collection: <a href="http://www.theboatplanscollection.com/catamaran-plans/" >http://www.theboatplanscollection.com/catamaran-plans/</a> Boat Design Net: <a href="https://www.boatdesign.net/forums/multihulls/free-catamaran-plans-54219.html" >https://www.boatdesign.net/forums/multihulls/free-catamaran-plans-54219.html</a> DIYCatamaran: <a href="https://www.diylargecatamaran.com/category/plans/" >https://www.diylargecatamaran.com/category/plans/</a> Multihulls 4 U: <a href="https://www.multihulls4u.com/diy-catamaran-plans/" >https://www.multihulls4u.com/diy-catamaran-plans/</a> BoatBuilderCentral: <a href="https://boatbuildercentral.com/category/boat-plans/power-catamaran.html" >https://boatbuildercentral.com/category/boat-plans/power-catamaran.html</a> Before beginning the project, be sure to read and understand all instructions, diagrams, and safety guidelines that are included in the plans. Additionally, consider consulting with a professional boat builder in the case of any questions or doubts.

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The Ultimate Guide to Choosing Between a Sailboat or Catamaran for Your Sailing Adventures

C hoosing between a sailboat and a catamaran for your sailing adventures is a significant decision that depends on various factors, including your sailing preferences, experience level, budget, and intended use. Here's an ultimate guide to help you make an informed decision:

1. Sailing Experience:

• Sailboats: Typically require more skill and experience to handle, especially in adverse weather conditions. Ideal for sailors who enjoy the traditional feel of sailing and are willing to invest time in learning and mastering the art.
• Catamarans: Easier to handle, making them suitable for beginners. The dual-hull design provides stability, reducing the learning curve for those new to sailing.

2. Space and Comfort:

• Sailboats: Generally have a narrower beam and less living space. However, some sailboats may offer comfortable cabins and amenities.
• Catamarans: Wider beam creates more living space. Catamarans often have multiple cabins, spacious saloons, and expansive deck areas, providing a more comfortable living experience.

3. Stability:

• Sailboats: Monohulls can heel (lean) while sailing, which some sailors enjoy for the thrill but can be discomforting for others.
• Catamarans: Greater stability due to the dual hulls, providing a more level sailing experience. Reduced heeling makes catamarans suitable for those prone to seasickness.

4. Performance:

• Sailboats: Known for their upwind performance and ability to sail close to the wind. Some sailors appreciate the challenge of optimizing sail trim for efficiency.
• Catamarans: Faster on a reach and downwind due to their wide beam. However, they may not point as high into the wind as monohulls.
• Sailboats: Typically have a deeper draft, limiting access to shallow anchorages and requiring deeper marina berths.
• Catamarans: Shallow draft allows access to shallower waters and secluded anchorages, providing more flexibility in cruising destinations.
• Sailboats: Generally more affordable upfront, with a wide range of options available to fit different budgets.
• Catamarans: Often more expensive upfront due to their size and design. However, maintenance costs may be comparable or even lower in some cases.

7. Mooring and Docking:

• Sailboats: Easier to find slips and moorings in marinas designed for monohulls.
• Catamarans: Require wider slips and may have limited availability in certain marinas, especially in crowded anchorages.

8. Intended Use:

• Sailboats: Ideal for traditional sailors who enjoy the art of sailing, racing enthusiasts, or those on a tighter budget.
• Catamarans: Suited for those prioritizing comfort, stability, and spacious living areas, especially for long-term cruising and chartering.

9. Resale Value:

• Sailboats: Generally have a more established resale market, with a wider range of buyers.
• Catamarans: Growing in popularity, and well-maintained catamarans often retain their value.

10. Personal Preference:

• Consider your personal preferences, the type of sailing you plan to do, and the kind of lifestyle you want aboard your vessel.

In conclusion, both sailboats and catamarans have their advantages and disadvantages. Your decision should be based on your individual preferences, experience level, budget, and intended use. If possible, charter both types of vessels to experience firsthand how they handle and to help make a more informed decision based on your own preferences and needs.

The post The Ultimate Guide to Choosing Between a Sailboat or Catamaran for Your Sailing Adventures appeared first on Things That Make People Go Aww .

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• July 13, 2024

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The Investigation : F.B.I. officials told Congress that the 20-year-old gunman who tried to kill Donald Trump used his cellphone and other devices to search for images of Trump and President Biden .

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The Gunman : In interviews, former classmates of the suspect described him as intelligent but solitary , someone who tried to avoid teasing by fellow students.

Secret Service Director : Kimberly Cheatle  returned in 2022 to lead the agency she had served for nearly 30 years. Now, the assassination attempt on Trump has thrown her tenure into uncertainty .

Fears of What’s Next : Among voters, there is growing anxiety that America’s political divide is nearly beyond repair, and the shooting only made things worse .

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