catamaran hull mold

DIY Cruising Catamaran: Complete Building Guide

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A brand-new cruising catamaran can set you back a hefty amount of money. However, a DIY cruising catamaran provides a more affordable way to own your own boat. While building a large boat can be an extremely challenging and time-consuming experience, nothing beats the pleasure of bringing your own boat to life.

To build a DIY cruising catamaran, buy good design plans, determine your budget and find a working space. Next, choose your hull material, buy supplies and start building the mast beam. Build and sheathe the hull, install bulkheads, the interior, and finally, launch the catamaran boat.

In this article, you will find a complete guide to building your own catamaran. You will also find detailed information on why you may want to consider building your catamaran and approximately how much this project would cost. Finally, we will explore the advantages and disadvantages of building a catamaran from scratch.

Why You Might Want To Build Your Own Catamaran

Most people might think that purchasing a used boat to repair and fix it up would be cheaper than a DIY cruising catamaran. But while building your own catamaran could be an enormous undertaking, it also comes with many advantages over buying something used.

Other than the unique opportunity to create beautiful memories and experiences while cruising, sailing, and exploring beautiful coastlines, there are a number of benefits that come along with the DIY approach.

Knowing Your Boat

Building your own catamaran provides you with intimate knowledge of your boat. You will know every corner, including where to find every bolt, wire, bulkhead, rib, hose, and support as you installed them yourself. This knowledge will enhance your confidence while at sea since you will have entrusted your life to a boat whose history you are aware of and deeply connected to.

Pride of Ownership

The satisfaction you get from crafting something with your own hands is immense. As a result, the knowledge that you built your boat from scratch will fill you with absolute pride and an immense sense of achievement. Furthermore, as an owner-builder, you get to keep and enjoy the boat for as many years as you wish.

Substantial Cost Savings

Building your catamaran will work out cheaper than buying a new or even gently used boat. Though you will likely require some additional labor since doing some things will require an extra pair of hands, if you are particularly good at DIY, you will save a significant amount of money on labor costs as a whole.

Freedom To Create Your Own Designs

If you decide to buy a catamaran boat, it might not be easy to find one that meets your unique needs. However, instead of choosing from production boats that bear traditional and outdated designs, you can come up with an ultra-modern design or style for your catamaran. You also get to pick your layout, size, and equipment based on your taste and budget.

Great Learning Experience

Building your own boat will help you pick up numerous skills that will come in handy later when sailing your boat. As much as you might still require an expert to help you with specialized skills like carpentry or wiring, your new skills will serve you well. This will also be beneficial when it comes to your boat’s maintenance and fixing things for yourself.

What To Look For in Catamaran Boat Designs

When deciding on the type of catamaran boat to build, you may want to choose a design that’s simple and easy to build. This is because doing so will allow you to spend a shorter time building the boat.

You also need to have a set of requirements to guide you in choosing your design or what you might call an ideal cruising catamaran wish list. This is essential because, ultimately, you want to build a boat that offers outstanding qualities such as:

Delivers good speed
Affordable to own and operate
Agile, strong, and easy to maintain
Has a high resistance to capsizing
Great for sailing and cruising
Delivers a comfortable and easy motion underway
Good handling ability and high performance under sail
User-friendly embarking and disembarking
Provides ample living and accommodation space
Presents a reasonable resale value

It’s worth noting that, in general, catamaran boats tend to offer a fair resale value mainly because of scarcity and the high price accorded to production models. So, if you build a well-constructed catamaran, you are bound to get a return that’s much higher than the cost of materials upon resale.

It’s also good to consider whether the design you settle on is from an established designer. This is significant because documentation of the building process is just as valuable when it comes to selling the boat.

How Much Would It Cost To Build Your Own Catamaran?

The cost of building your cruising catamaran will depend heavily on the size of the boat you plan to build and the skills you bring to the table. To give you an idea of probable costs, a professionally built 40 foot (12.1 m) long cruising catamaran could go for up to $300,000.

Though building it yourself will undoubtedly be cheaper, most DIY boatbuilders tend to underestimate the expected costs. Your final costs should cover not only the cost of material and equipment but also the labor and time it would take to come up with the final product.

If you were to build a 40-foot (12.1-meter) catamaran, your cost of materials would range between 20-30% of the total cost. Therefore, for $300,000 total, the boat’s materials would range between $60,000 and $90,000. The hull tends to range between 15-35% of the total build. Again, this depends on the finish and furniture.

But before you even start working on the DIY project, you will need to figure out where to do the work. If your home has ample space, then you can opt for a backyard building. But if you live in a small apartment, then you might want to consider renting a small garage at first and then move on to a boatyard later. This is one of the significant costs involved in building your multi-haul.

What You Will Need

To get a clearer picture of how much the entire project would cost, let’s have a look at what else you will need to purchase.

Good design plans
Working space
Ground tackle
Matting and roving
Equipment such as the engine, windows, rudders, deck fittings, mast, and rigging

In addition to the above, you also need to install plumbing and electricals. You may also want to consider going electric rather than using diesel. Not only will this drastically reduce your maintenance costs, but you get to use the regenerated power for all of your housing needs while sailing.

Some catamaran boat designs help you save costs by advocating the use of less expensive corpus materials. Most of the material goes directly into making the boat, which means there is hardly any wastage on vacuum bagging . With this method, there are few molds and temporal building forms and fewer fillers to grind off as waste. All these factors reduce the time and cost it takes to build your catamaran boat.

That said, building a boat of any kind is a huge financial undertaking. As such, you still need to have the financial ability to keep building; otherwise, your project will stall or take much longer than anticipated. Instead of enjoying yourself and making memories cruising to faraway lands, you might end up spending all your time building a seemingly never-ending boat.

To reiterate, this project is more of a labor of love, given that it involves a tremendous amount of manual work. Calculating an hourly rate on the time spent building the boat and adding this cost to that of materials may make it seem a very pricey exercise. However, it is vital to understand that your time matters, and every hour you spend working for “free” should be included.

With that in mind, you need to ensure that you are fully devoted to the boat construction project and are sure you want to do it before you begin. Stopping halfway because it seems like too much work would be incredibly costly.

How To Build a Catamaran

When it comes to building a cruising catamaran, you have 3 main options:

You can buy an old boat and refurbish it.
Purchase a bare hull plus deck molding for a home-boat building.
Start from scratch and build everything, including the hull, on your own.

As mentioned above, renovating an existing boat may end up being more costly than starting from scratch. To build a catamaran boat from scratch, follow the below step-by-step guide.

Prepare the Essentials

Before you jump into such a large project, there are several important aspects to consider:

Buy your plans from an established catamaran designer. You can also get inexpensive, easy-to-build catamaran designs online.
Get access to a large working space or build a shed . Depending on your climate, you may need to opt for climate control to avoid an excess of moisture in humid areas.
Decide on your choice of hull material. This could be fiberglass, aluminum, steel, wood, or ferroconcrete.
Start working on a bill of materials estimate. Include everything that you think you need to get a better idea of the initial costs.

Build the Mast Beam

Using wood and epoxy, cut and glue together the pieces of wood that will form the mast beam. Most of the work at this stage can occur in a garage since it involves building small parts. Still, the work could take up to 4 months, so be prepared to put in long hours.

Build the Boat Hull

Now, it’s time to build the boat’s hull. A catamaran comprises two hulls which are connected with a deck. Below is a short video showing how to build a hull mold:

This work requires a larger facility, so you might need to move out of the garage and into a boatyard. If you don’t have access to a larger workshop, consider building a shed where you can work as you do the construction. Make sure there’s enough room to fit the boat and also allow you to work comfortably. To cover the shed, you can use opaque white tarps.

Sheathe the Hull

Get all the materials you require for this stage in the construction, such as lots of resin, fiberglass, and foam for use in the hull cores. You’ll also require matting and glass roving to sheath the hull .

Sheathing helps to make the hull impervious to water and other marine borers. But first, you need to prepare the hull using a rotary sander. To make it as smooth as possible, use light, sweeping strokes. This is a very dusty task so be prepared to wear a facemask and safety goggles.

Install the Bulkheads

Next is installing the plywood bulkheads . You might need to call in friends to help turn the hulls or use a crane. In this step, you will need to laminate the hull sides on the molded hull panels and bond them above the bulkheads. Ensure the bulkheads are snug and sealed in place.

Construct the Interior Structure

Over the next couple of months, the boat work will involve joining the hulls together with the beams that you had made back in the garage. Then, install the cuddy cabin, decks , and the cockpit . Soon the boat will start to take the shape of a catamaran.

Next, proceed to construct the major structural components such as stairs, hatches, mini-keels, and the interior. Then comes the work of fairing the boat, which is quite labor-intensive.

Finally, it’s time to apply primer on the catamaran boat and start the paintwork. Before painting the boat, you will need to do additional sanding to finish off the two layers of primer as well as fill all the pinholes. Since it’s a large boat, the catamaran has lots of surface area; thus, the sanding could get extremely exhausting—mentally and physically—at this point.

The painting can take a while, too. The hulls are the easiest to paint, but the topsides, non-skid, as well as masking and prepping could seem never-ending.

The final stretch involves working on the center bridge deck cabin and other final touches like installing the engines, electricals, and plumbing. This is also the time to fix the rudders, rigging, mast, windows, and deck fittings.

Launch Your Cruising Catamaran

After many months or years of hard work, your cruising catamaran is finally ready to test the waters. After lowering the boat into the water, check carefully in case there are leaks. If none, you can set up the sails and take your catamaran out for your first cruise.

Below is a short video that takes you through the entire boat-building process:

If you don’t have deep pockets, don’t despair. It’s also possible to build an inexpensive catamaran boat, as shown in this post from the coastal passage .

The Pros of Building a Catamaran

Though it will be a costly endeavor, there are so many things to look forward to should you decide to build your own catamaran:

It can be lots of fun.
You get to have a new boat.
It’s an excellent hobby for DIY enthusiasts.
The effort is rewarding.
It offers a great learning experience.
You get the exact kind of boat you want.
You can alter building plans and tailor the boat to suit your specific needs.
It might be cheaper than buying a new boat.

The Cons of Building a Catamaran

Though there are a number of positive aspects to a DIY build, it is just as important to keep in mind that it won’t always be easy:

Maintenance costs can be quite high.
It’s both mentally and physically exhausting.
It might require some technical know-how.
It can take many months or even years to complete.
It requires a lot of commitment to finish the DIY project.
It might be challenging as well as expensive to get insurance.
You will spend almost all your free time building the boat.

DIY Cruising Catamaran Tips and Tricks

If you are new to boat building, it would be a good idea to build a small boat first. This would give you a good indication as to whether you’d enjoy tackling a more extensive project like building a catamaran. Again, if you are the handy type, fixing your own electronics could also save you a significant amount of money.

Here are more tips and tricks to get the most out of your DIY cruising catamaran:

Lower your costs. Bring down your costs even further by sourcing for parts and supplies at marine surplus outlets, Craigslist, eBay, or wholesale suppliers.
Enhance your resale value. Most home-built boats are not easy to sell since they tend to be too customized. To enhance your resale value, it’s advisable to work with a standard design from a well-established naval architect.
Follow the design instructions. Make sure to follow the designer’s instructions regarding the type of materials and tools to use during the build to avoid making costly mistakes.
Maintain your original budget. Avoid any additional customizations once you have started building the boat. Using good plans and sticking to them ensures that your budget doesn’t spiral out of control.

Final Thoughts

Building a catamaran is about more than saving money. It’s fun, exciting, fulfilling, and can be a great learning experience. While it might take many months of back-breaking work, comparative shopping and sourcing for materials will help you save a lot of money. Still, at the end of it all, you’ll have a beautiful catamaran boat, all ready for your first cruising adventure.

However, if you have neither the time nor the energy to build your own catamaran from scratch, refurbishing an existing hull might prove faster and easier. It also works out much cheaper than buying a new boat.

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!

One thought on “ DIY Cruising Catamaran: Complete Building Guide ”

Hello, I am a French Quebecer who is original, imaginative, creative and who finds that all boats and catamarans have a huge flaw and a very big lack of logic. I would have a brand new concept…. I am sending this message to any catamaran creator – designer to make those who have the opportunity and the intelligence to want to know about my innovative idea which will finally upset the market much richer. An idea that will totally change the concept of sailing, navigation and save so much worry!! All I would ask for is a small percentage of each sale of the new product. To be able to make me produce one when I have enough!! It is certain that like that, you just want to tell me: come on Mr. Lessard give us your idea but do not take your word to help me in return! But, if you are the kind of man to have only one word and maybe have a proof of your good faith if the realization of the project would make it… I will be very happy!! Giving it to everyone wouldn’t bother me either…. all I would like is to be able to find flax fiber (too expensive carbon) to be able to try to make my catamaran myself. Because not rich! Have a nice day and looking forward to having a message!!

Building expertise: our catamaran construction principles

At Outremer every specification has to be precise and consistent with what the naval architect has drawn. During catamaran construction, he or she works in close collaboration with the designers and engineers to reach a harmonious end result.

Safety, reliability, performance, comfort, and pleasure are the key words throughout the design of an Outremer blue water catamaran.

Peace of mind no matter the weather conditions.

An absolute priority for all sailors! We can accept that for racing boats, risks are knowingly taken into account, but for cruising catamarans, a very big safety margin is fundamental. For this reason, the daggerboards are essential to guarantee good upwind sailing, even in difficult situations (storms, rough seas, etc.). We don’t always choose to find ourselves in such situations, but Outremer will bring you back to port, in all conditions.

Resisting the test of time and continuous improvement

Every Outremer will without doubt cover several hundreds of thousands of miles across oceans or around the world during its lifetime and it is crucial that every system is proven and reliable. To achieve this, Outremer takes particular care with the standard of finish, with its choice of technologies and the selection of brands of equipment they install on their boats. What’s more, every year we conduct a survey among all new Outremer owners to help us consistently improve our liveaboard catamaran construction techniques. This feedback is especially important: it allows us to get closer to building the “perfect boat”!

Combining comfort and pleasure of sailing

Multihulls from the Outremer yard are of course, not racing yachts, but they are among the fastest of cruising boats! Performance is both a source of pleasure for any sailor and also an essential safety factor allowing the crew to have more options when facing weather risks, especially single-handed.

Unparalleled quality of life onboard

One of the keys to successful cruising! The quality of life on board depends essentially on comfort at sea. All the elements which go into making an Outremer are combined to achieve an incomparable quality of life with a comfortable interior: more gentle movement allows for quality sleep, no slamming under the bridgedeck, and reduced pitching, leading to good cooking conditions for whoever is in the galley. Silence on board, the absence of any creaking or groaning, so often found on a sailing catamaran, guarantees unrivaled peace and quiet.

Easy sailing and fun for all

Because the pleasure shared between the crew is the guarantee of harmonious life on board during a blue water sailing journey, Outremer takes everyone’s needs into account: skipper, crew, children, guests… Everyone can enjoy 360° visibility, perfect ventilation, and great ergonomics. And of course, the enjoyment of sailing, feeling a boat which goes fast and well, as seen when using the tiller which is available on Outremer boats, an incomparable way to feel a multihull slipping effortlessly through the water!

Loïck Peyron, 4X sponsor: “The point of sailing is the point of departure and the destination. Between the two, the sailing part is fun, of course, but it’s often too long!”

Architecture

Designing the ideal boat

Naval architects translate specifications into lines and volumes:

Hull designs carefully studied and optimized; long, to carry the required load and reduce forward resistance. Fine hulls demand, in effect, little power to make the move and allow them to maintain high average speeds under way. Not just that, but also to be able to use only one motor when there is no wind, reducing the amount of noise in the hulls when some of the crew are off watch, and also doubling the range under power.
Windage is limited for maneuvers in port and for better holding at anchor.
Centering the weight: a very low center of gravity, and weight distribution around that center of gravity – all these unseen elements add to the quality of sailing and reduce pitching movement.
Fine bows absorb pitching and help produce high levels of comfort under way.
Daggerboards for sailing to windward, going faster when close-hauled and being able to reach otherwise inaccessible anchorages. Sailing close-hauled on an Outremer catamaran is worthy of the best monohulls, even in the hardest of conditions.

Catamaran construction principles: how are Outremer multihulls made?

The methodology of the Outremer boatyard: putting forward a blend of high-tech technologies and know-how. Blue water cruising programs require significant safety margins: you need to be able to count on your boat in all circumstances!

Even though the philosophy of the yard of is to reduce weight, this must never be done to the detriment of the structure, and our designers are committed to reinforcing the essential areas: the bows are protected by several watertight crash-boxes, the lower part of the hulls are resistant to collision and knocking, the daggerboard wells are indestructible as the daggerboards act as a fuse, making it insubmersible as a result.

Even though modern composites such as those found in sandwich construction are essential materials for saving weight, an Outremer always has the lower part of the hull built in a very thick monolithic laminate: in the event of collision, no structure in sandwich construction could compete with the strength of an Outremer hull. The structure is completely laminated in the hull, and not simply glued on: there is no backing mold interfering with access to any part of the underwater hull, and all the systems remain visible and accessible.

The stiffness of an Outremer catamaran is incomparable

The main bulkheads are of large dimensions, and so are able to take much greater loads than a cruising multihull might encounter. Inserts in carbon fiber, closed-cell foam, isophthalic resins and high-resistance polyester: everything is designed to guarantee your safety for offshore sailing.

For the furnishings, sandwich panels are used to reduce weight, with wood veneer for warmth and aesthetic appearance. The furnishings do not add to the rigidity, and are insulated from the structural parts to reduce unwanted noise, creaks and groans. Aluminum structures support the floors, which don’t squeak either. No more wedged doors or drawers that won’t shut. For the equipment, we choose brands and makes for their quality, their reliability and their suitability with the boat’s program.

An Outremer is designed to be around for over fifty years

Owners change over time, all with ambitious projects and wanting to replace or add certain equipment to their cruising catamaran! In this respect, we apply four golden rules: every part of the boat and every system installed must be documented, be accessible, able to be checked and be replaceable.

Today, more than three million miles have been sailed by our multihulls on every ocean, most of them cruising tropical seas, though many have seen extreme conditions, ranging from Alaska to Patagonia. The huge amount of experience accumulated by Outremer has allowed us to refine and consolidate our principles of catamaran construction.

Composites - strong, durable, light, versatile, insulative... without corrosion, UV or fatigue. It's time to innovate...

Mar 1, 2021

Catamaran molds shipped from factory

This morning, 1 March 2021, Triac Composites shipped the catamaran hull molds for an international customer.

Triac Composites also built the plugs using our 7 axis Kuka milling robot from which the molds were made.

The molds can be seen in the photos below being loaded onto trucks for shipping from Triac Composites' factory.

Plugs / molds

Catamaran Hull Design

Post author By Rick
Post date June 29, 2010
2 Comments on Catamaran Hull Design

Part 1: Notes from Richard Woods

Since the America’s Cup experimented with going multihull, there’s been a lot of interest in catamaran performance and the catamaran hull designs that define performance. Many guys are investigating whether to buy a catamaran or design and build their dream boat. Let it be said here that building a large catamaran is not for the faint of heart. People begin building 100s of boats a year, yet few are ever completed, as life always seems to have a way of interfering with a good boat build.

Never the less, since the rest of this website is about selecting and buying a boat , it only seems fair to have at least one webpage that covers catamaran design. This page contains notes on boat hull design goals and an accompanying page from Terho Halme has mathematical formulas used in actual catamaran hull design. It has become a popular research stop and an important reference to the catamaran design community.

The content of this page was reproduced from the maestro of Catamaran designs, renown British naval architect, Richard Woods, who not only designs catamarans, he sails them across oceans…. repeatedly. He has a lot to say on the subject of catamaran hull design.

“…When it’ all said and done, the performance of a sailing catamaran is dependent on three primary specs: length, sail area and weight. If the boat is longer it generally means it’ a faster boat. If she has more sail area, it means she’ a faster boat and if she’ light it means she’ a faster boat. Of course, there are limits: Too much sail area capsizes the boat in brisk winds. If the boat is designed too light, she will not take any kind of punishment. Too slim a hull design and the boat becomes a large Hobie Cat capable of only carrying your lunch. Of course, too long and large and you’d have to be Bill Gates to afford one. Then there are lot of additional and very important factors like underwater hull shape, aspect ratios of boards and sails, wet deck clearance, rotating or fixed rigging and so on….” Richard Woods

All Catamarans are not equal, but all sailboats have two things in common: They travel on water and they’re wind powered, so the Catamaran design equations in the 2nd part should apply to every catamaran from a heavy cruising Cat to a true ocean racer.

Richard Wood’s comments on catamaran design:

We all know that multihulls can be made faster by making them longer or lighter or by adding more sail. Those factors are the most important and why they are used as the basis of most rating rules. However using just those figures is a bit like determining a cars performance just by its hp and curbside weight. It would also imply that a Tornado would sail as fast forwards as backwards (OK, I know I just wrote that a Catalac went faster backwards than forwards)

So what next?? Weight and length can be combined into the Slenderness Ratio (SLR). But since most multihulls have similar Depth/WL beam ratios you can pretty much say the SLR equates to the LWL/BWL ratio. Typically this will be 8-10:1 for a slow cruising catamaran (or the main hull of most trimarans), 12-14:1 for a performance cruiser and 20:1 for an extreme racer.

So by and large faster boats have finer hulls. But the wetted surface area (WSA) increases proportionately as fineness increases (for a given displacement the half orange shape gives the least WSA) so fine hulls tend to be slower in low wind speeds.

The most important catamaran design hull shape factor, is the Prismatic Coefficient (Cp). This is a measure of the fullness of the ends of the hull. Instinctively you might think that fine ends would be faster as they would “cut through the water better”. But in fact you want a high Cp for high speeds. However everything is interrelated. If you have fine hulls you can use a lower Cp. Most monohulls have a Cp of 0.55- 0.57. And that is about right for displacement speeds.

However the key to Catamaran design is you need a higher Cp if you want to sail fast. So a multihull should be at least 0.61 and a heavy displacement multihull a bit higher still. It is difficult to get much over 0.67 without a very distorted hull shape or one with excessive WSA. So all multihulls should have a Cp between 0.61 and 0.65. None of this is very special or new. It has been well known by naval architects for at least 50 years.

There are various ways of achieving a high Cp. You could fit bulb bows (as Lock Crowther did). Note this bow is a bit different from those seen on ships (which work at very specific hull speeds – which are very low for their LOA). But one problem with them is that these tend to slam in a seaway.

Another way is to have a very wide planing aft section. But that can increase WSA and leads to other problems I’ll mention in a minute. Finally you can flatten out the hull rocker (the keel shape seen from the side) and add a bustle aft. That is the approach I use, in part because that adds displacement aft, just where it is most needed.

I agree that a high Cp increases drag at low speeds. But at speeds over hull speed drag decreases dramatically on a high Cp boat relative to one with a low Cp. With the correct Cp drag can be reduced by over 10%. In other words you will go 10% faster (and that is a lot!) in the same wind and with the same sails as a boat with a unfavorable Cp. In light winds it is easy to overcome the extra drag because you have lots of stability and so can fly extra light weather sails.

The time you really need a high Cp boat is when beating to windward in a big sea. Then you don’t have the stability and really want to get to your destination fast. At least I do, I don’t mind slowly drifting along in a calm. But I hate “windward bashing”

But when you sail to windward the boat pitches. The sea isn’t like a test tank or a computer program. And here I agree with Evan. Immersed transoms will slow you down (that is why I use a narrower transom than most designers).

I also agree with Evan (and why not, he knows more about Volvo 60 design than nearly anyone else on the planet) in that I don’t think you should compare a catamaran hull to a monohull, even a racing one. Why chose a Volvo 60/Vendee boat with an immersed transom? Why not chose a 60ft Americas Cup boat with a narrow out of the water transom??

To be honest I haven’t use Michelet so cannot really comment. But I have tested model catamarans in a big test tank and I know how inaccurate tank test results can be. I cannot believe that a computer program will be better.

It would be easy to prove one way or the other though. A catamaran hull is much like a frigate hull (similar SLR, L/B ratios and Froude numbers) and there is plenty of data available for those. There is also a lot of data for the round bilge narrow non planing motorboats popular in the 1930’-50’s which again are similar to a single multihull hull.

One of the key findings I discovered with my tank test work was just how great the drag was due to wave interference between the hulls. Even a catamaran with a modern wide hull spacing had a drag increase of up to 20 % when compared to hulls at infinite spacing. One reason why just flying a hull is fast (the Cp increases when you do as well, which also helps). So you cannot just double the drag of a single hull and expect to get accurate results. And any speed prediction formula must include a windage factor if it is to give meaningful results.About 25 years ago we sailed two identical 24ft Striders next to each other. They were the same speed. Then we moved the crew of one boat to the bow. That boat IMMEDIATELY went ½ knot faster. That is why I now arrange the deck layout of my racing boats so that the crew can stay in front of the mast at all times, even when tacking or using the spinnaker.

I once raced against a bridge deck cabin catamaran whose skipper kept the 5 crew on the forward netting beam the whole race. He won.

Richard Woods of Woods Designs www.sailingcatamarans.com

Tags Buying Advice , Catamaran Designers

Owner of a Catalac 8M and Catamaransite webmaster.

2 replies on “Catamaran Hull Design”

I totally agree with what you say. But Uli only talk sailing catamarans.

If only solar power. You need the very best. As limited watts. Hp.

The closer to 1-20 the better.

Closing the hulls to fit in cheaper marina berth. ?

You say not too close. But is that for sailing only.

Any comment is greatly appreciated

Kind regards Jeppe

Superb article

[email protected]

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Back in 2013 I knew that my boat batteries were reaching the end of their lives, I had been researching LiFePO4 cells for a few years and decided that I should install them. Unfortunatly I was unable to find a local supplier. So Lithium Power was established.

Technical Information

The technical information page is a collection of documents (mostly in pdf format) on the materials and systems used in schionning catamarans. including data sheets, engineering information, strength comparisons of each core material and informative articles from jeff outling the design of certain system such as engine choices and main sheet systems., detailed engineering data for your research, we understand that getting your head around the process of building your own boat, or having one built, can take a little while. to gain a greater understanding of the materials used in our designs, the below data sheets have been supplied by atl composites, and contain all of the technical data you could need regarding the composites we use. in addition are articles or documents written by jeff about certain systems used on our designs and why., all technical information and data sheets on west system/duflex/durakore provided courtesy of atl composites. for more information please see the atl composites website here., documents library.

Information Sheet – CE CERTIFICATION PROCESS

Mainsheet Systems for Catamarans
Motor Choices for Schionning Designs
Weight and Weight Distribution Schionning Designs
Schionning Designs Sailing Performance and Tips
Hull Shapes and Performance – Power Designs
Outboard Engines VS Diesels – Written by Ross McCombe
An Outboard Installation That Works – Ross McCombe Follow up
Data Sheet – DUFLEX BALSA for Catamaran Kit Builds
Data Sheet – DUFLEX FOAM
Data Sheet – FEATHERLIGHT Paper Honeycomb
Data Sheet – WEST SYSTEM R105
Data Sheet – PUMP SYSTEMS
Data Sheet – MICROFIBRE BLEND 403
Data Sheet – MICROLIGHT 410
Data Sheet – MICROSPHERES 411
Information Sheet – USING FILLERS
Data Sheet – KINETIX RESIN Thixotropic
Information Sheet – DURAKORE PLANKS 413
Data Sheet – DURAKORE PLANKING 414

Kit Materials Contents

Kit materials' contents, so if you order a schionning kit, what exactly is going to arrive see an overview of the materials you will receive, and what each is used for during the build process. fibreglass cloth or tapes microspheres, microballoons or microfibers take a closer look and you can answer these questions., our schionning kits are a no nonsense, common-sense approach to building a boat. we offer great service, fast delivery and access to anything you could need for your boat straight from the supplier to your door. our construction plans and kits are sold with 100% professional boatbuilder support via phone and email, any time you're unsure or just need a second opinion, we're here..

Our kits contain all of your basic materials to build your boat to a faired shell stage, ready for painting and fit-out. We have sail-away costing estimates available for all of our standard designs, and this will give you an accurate idea of the overall cost of your project. This costing varies depending on your level of finish, as you can imagine different options vary greatly in price.

Below is a quick glance at what your Schionning Kit will include and what each item is primarily used for, we hope this is helpful and if you should require more detailed information please don’t hesitate to contact our office.

What do I actually receive?

Superlight Balsa - End-Grain Balsa - Foam - Paper Honeycomb - Western Red Cedar - SDI - End-Grain Balsa - 150kg per cubic metre Paper Honeycomb - 50kg per cubic metre Superlight Balsa - 94kg per cubic metre Western Red Cedar - 360-380kg per cubic metre - Foam

DUFLEX PRE-LAMINATED PANELS

DuFlex pre-laminated panels are the main and most important material used in our kits, predominantly in the flat panel designs, however they are used in Strip-planked designs also, though to a lesser extent. These panels are 2400mm x 1200mm and are CNC routed to speed up build time on our Wildernes X Series, as well as some of our power designs. For internal furniture, a paper honeycomb core is used instead of the end-grain balsa wood core that is used for main structural areas. The use of this is purely to save weight in the shell and therefore produce a faster, more responsive catamaran.

KINETIX LAMINATING RESIN & HARDENER

Resin Choices for Catamaran Kit Building by Schionning Designs SDI - We choose ATL Composite's resin systems for their superior quality, reliability and value for money. West System Epoxy Resins

WEST SYSTEM EPOXY RESINS

FIBREGLASS TAPES (DOUBLE BIAS)

CARBON FIBRE CLOTH

FIBREGLASS CLOTH

The kit process, building your own boat can be a daunting prospect, however to demonstrate each step in the kit assembly process, we've created this guide for you to study. as you can see our kits are the ultimate in building efficiency and have been streamlined over 30+ years to ensure that you're on the water faster and with less effort., how does it all go together.

Schionning Designs Catamaran Kit Build Process - Step 1 The first step to building your dream catamaran begins with a strongback - this is a square frame used to position the temporary frames that will be used to form the hull shape. This frame will be set up and must be square and accurate, a string or laser level can be used to achieve this.

The first step to building your dream catamaran begins with a strongback – this is a square frame used to position the temporary frames that will be used to form the hull shape. This frame will be set up and must be square and accurate, a string or laser level can be used to achieve this.

Step 2 pre-cut frame panels are erected along the strongback in sequence - catamaran building step 2 SDI

The forebeam is now installed along with the striker attachment fitting, as shown above. The bridgedeck is installed shortly after and taped onto the bulkheads with webs installed, this now completes what is a quite stiff and strong platform to work on.

Step 8 catamaran kit building - forward webs and dash will be fitted - SDI

Now that the bridgedeck is in place, the forward webs and dash will be fitted. At this stage, all furniture and internal work begins, with the main panels left off for ease of access when working.

Catamaran Kit Building Processs by Schionning Designs SDI -Step 9 The internal furniture is now installed, if you chose Kit Option 2, this furniture will be pre-cut to your previously decided upon layout. If you chose to receive blank panels, this is the period in which your internal living areas are to be built. This construction uses paper-honeycomb Duflex panels, as these are superior in weight when used non-structurally. Cabin soles, engines and daggerboard cases are also now installed.

Material Choices

Schionning material choices, solutions that work best for catamarans & why, our designs are based on cored composite construction techniques using west system epoxy resin and knitted fabrics. but given the range of today's composite technologies, which solution works best for catamarans and why written by jeff schionning, selecting the correct materials, resin choices.

It also fully protects the boat against water absorption and it can not develop the dreaded Osmosis.

We choose ATL Composite’s resin systems for their superior quality, reliability and value for money.

Having worked closely with the ATL Composites team and their products for many years, we know we can stand by their material solutions, and rely on great service should something unexpected happen.

This may not seem important but when working with a material for an extended period of time, the small things make all the difference.

CORES Which One to Use?

End-Grain Balsa – 150kg per cubic metre
Superlight Balsa – 94kg per cubic metre
Western Red Cedar – 360-380kg per cubic metre
Foam – 80kg per cubic metre

BALSA END GRAIN (150 kg/cubic metre)

Balsa has very good values and we can produce a shell using a very light laminate. It will be very stiff and very resilient to fatigue.

It has exceptional qualities including very high compression strength, extremely good sheer capabilities and fantastic sheer stiffness.

Compressive strength is the resistance to collapsing when pressure is applied perpendicular to the surface as when pushing directly onto the material with the point of your finger. Balsa is far stronger than Foam (80kg/cubic metre) in compression.

Balsa is also very strong in shear. This is when the core sample is held flat between your hands, one hand slid one way and the other slid the opposite way, when the core tears through the middle the core has failed in sheer. The amount of stretch you feel before the core shears is shear stiffness. To compensate for sheer weakness the core is made thicker. So 13mm Balsa may be equal in sheer to 19mm Foam.

(80 to 200 kg/m³)

There are many boats sailing that are built from foam as it’s mechanical properties are good for boat building.

Initially one would expect this cat shell to be lighter as it is ½ the weight of Balsa. We do have to compensate for its weaknesses and will then add to the reinforcement the reinforcement on the outside to spread that compression load over more core and need a triaxial type weave to compensate for the veneer content that runs fore and aft on the Durakore.
Secondly, we need to increase the Core thickness to compensate for the shear value, usually neutralizing the weight advantage.
We only use structural foam core that is closed-cell and cross-linked.

The end result using foam core amounts to a very similar total boat weight. Professional builders can achieve a good result but usually use vacuum bagging and very good molds to achieve this.

Secondary Issues

Balsa can absorb water. It needs extreme neglect to rot (very unusual). Water soaks along the end grain quickly. It travels very slowly across the grain. We use balsa under the waterline especially because of it’s high compression strength for beaching etc. any core type must be sealed. Damage to all cores results in the same sort of repair. Notice a damp spot remaining when drying out to anti-foul… simply grind back the surface glass exposing the core, dry it out and re-glass – it’s that easy.

Timber cores are cheaper than Foam in most cases.

A light, high tech cat returns a far better (often 2 – 3 times) re-sale than lower tech materials. Often saving $10,000 on materials initially, loses $200,000 on re-sale – a serious reality.

Our boats can be built using Balsa, Foam or Western Red Cedar. Combine strength, stiffness, lightness and cost, with ease of use – it just makes good sense!

Multihullblog

37/40 catamaran molds.

The hull molds to the latest reverse bow 37/40 foot catamaran hulls are available at the very impressive Jim Betts boatyard. I will find the rendering of the 3D model. This is the mold to the top half of a hull.

2 thoughts on “37/40 Catamaran Molds”

Planing a new build about 12 m . What is this and where ?

a catamaran being built at Betts boatyard near seattle. do a search here using “betts” to see more

Catamarans and Trimarans with Kurt Hughes

Yamalo-Nenets Autonomous Okrug

Yamalo-Nenets Autonomous Okrug, Ural Federal District, Russia

Average elevation : 69 m

Zabaykalsky Krai

Zabaykalsky Krai, Far Eastern Federal District, Russia

Average elevation : 938 m

Rostov Oblast

Rostov Oblast, Southern Federal District, Russia

Average elevation : 102 m

Sverdlovsk Oblast

Sverdlovsk Oblast, Ural Federal District, Russia

Average elevation : 174 m

Tatarstan, Volga Federal District, Russia

Average elevation : 147 m

Tula Oblast

Russia > Tula Oblast

Tula Oblast, Central Federal District, Russia

Average elevation : 207 m

Tarumovsky District

Russia > Republic of Dagestan > Tarumovsky District

Tarumovsky District, Republic of Dagestan, North Caucasian Federal District, Russia

Average elevation : -18 m

Beloglinsky District

Russia > Krasnodar Krai > Beloglinsky District

Beloglinsky District, Krasnodar Krai, Southern Federal District, Russia

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The Marketplace Forums can be useful for members who know one another well from forum discussions and offline communications and wish to post boatbuilding tools, drafting tools, molds and tooling, and other professional equipment for sale or trade. However, caution and good judgement should always be used. Especially when considering any business with anyone not already well known to you and trusted, due diligence must be used to confirm details and identity and be sure the transaction is safe before any money or property changes hands. Always use good judgement and perform due dilligence and follow these guidelines.

39,34 and 29 performance cat molds for sale

Discussion in ' Boat Molds ' started by Steve Ortega , Jan 18, 2024 .

Steve Ortega New Member

I have cat molds for sale new designs never in production .. designed and tool by the biggest names in the industry. All wide body with wrap around window .. call or text Steve @925-321-6717 39’ 500k 34’ 400k 29’ 200k

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Catamaran Construction
All modern production catamarans are made with "FRP" construction (for Fiber Reinforced Polymer). Composites aren't new-it's just using materials together to strengthen the whole assembly. Straw was added to bricks centuries ago, and steel reinforced concrete is a staple of construction over the last century.
Catamaran Structure
Breaking a hull out of a mold is a complex process, and may involve cranes and heavy equipment to support the hull as it comes of the mold and to protect the tooling from damage. To remove a hull, you need space to lift the mold and to get heavy equipment around the tooling. And you've got to put the molds some place when it's done.
DIY Cruising Catamaran: Complete Building Guide
If you were to build a 40-foot (12.1-meter) catamaran, your cost of materials would range between 20-30% of the total cost. Therefore, for $300,000 total, the boat's materials would range between $60,000 and $90,000. The hull tends to range between 15-35% of the total build.
Catamaran construction principles: design, know-how
The stiffness of an Outremer catamaran is incomparable. The main bulkheads are of large dimensions, and so are able to take much greater loads than a cruising multihull might encounter. Inserts in carbon fiber, closed-cell foam, isophthalic resins and high-resistance polyester: everything is designed to guarantee your safety for offshore sailing.
44ft performance cruising catamaran hull mold (sailing)
44ft performance cruising catamaran hull mold (sailing) Discussion in 'Boat Molds' started by Steve W, Jul 3, 2019. Joined: Jul 2004 Posts: 1,871 Likes: 80, Points: 48, Legacy Rep: 608 ... I have a nice professionally built female hull mold on a nice roadworthy trailer for sale. If you are looking to build your own cat this will save you many ...
PDF Cylinder Mold Multihull Construction
The original KAMANU, the first C.M. USCG certified charter catamaran has been sailing nonstop for nearly seventeen years. A couple of dozen C.M. cats are now USCG certified. Builders ... developed plywood boats.) Certainly cylinder mold hull building was around before I began using it. The problem was, the panels that I saw being ...
Home [turnpointdesign.com]
Prototype Power Catamaran-Turn Point Design was contracted to design and build 28' foil assist catamaran hulls from environmentally friendly materials- flax fiber replaced ... Construction was epoxy infused fiberglass built in one off female molds. All fabrication, lamination, mold work, and fit out of systems was done at Turn Point Design. ...
Catamaran molds shipped from factory
This morning, 1 March 2021, Triac Composites shipped the catamaran hull molds for an international customer. Triac Composites also built the plugs using our 7 axis Kuka milling robot from which the molds were made. The molds can be seen in the photos below being loaded onto trucks for shipping from Triac Composites' factory. outsource. plugs.
Kurt Hughes Multihull Design
Order the Latest Design Portfolio today to see over 85 multihull plans in stock. Besides illustrating my stock designs, for which I sell study plans and full construction plans, it also contains my design philosophy of multihulls; an article on the rapid Cylinder Mold (pdf) or Cylinder-molding (in html) multihull construction; examples of ...
Catamaran Hull Design
If you have fine hulls you can use a lower Cp. Most monohulls have a Cp of 0.55- 0.57. And that is about right for displacement speeds. However the key to Catamaran design is you need a higher Cp if you want to sail fast. So a multihull should be at least 0.61 and a heavy displacement multihull a bit higher still.
Our Catamaran Build Kits
The first step to building your dream catamaran begins with a strongback - this is a square frame used to position the temporary frames that will be used to form the hull shape. ... or a block/pulley set-up. Once both hulls are turned the tops of the bulkheads will be used to join the two hulls, and then the bridgedeck component will be ...
Boat Molds
Home Boat Design Forums > Construction > Marketplace >. The Marketplace Forums can be useful for members who know one another well from forum discussions and offline communications and wish to post boatbuilding tools, drafting tools, molds and tooling, and other professional equipment for sale or trade. However, caution and good judgement ...
Commercial Catamaran Molds
jpcmarineworks New Member. I have for sale 2 single catamaran hull molds. One mold is 50' long 48" wide the other is 72' long 60' wide. I am asking $15K for both or $8k for the 70' mold and $7k for the 50' mold. Molds are in decent shape and stored inside.
37/40 Catamaran Molds
The hull molds to the latest reverse bow 37/40 foot catamaran hulls are available at the very impressive Jim Betts boatyard. ... This is the mold to the top half of a hull. Post navigation Previous Post Tax Day Sale Next Post Elua Sailing. 2 thoughts on "37/40 Catamaran Molds" Mel Rowe-Clark says: April 6, 2018 at 2:34 pm. Planing a new ...
2021 catamarans: Seawind 1370
In July 2020, our newest 45ft catamaran model was introduced and we ha... This week, we got one of the most exciting delivery of 2021: Seawind 1370 HULLS MOLDS! In July 2020, our newest 45ft ...
Skater Ready For First 588 Catamaran Build
With the hull mold completed, Skater is ready to build its first 588 model catamaran. Photos copyright speedonthewater.com. The 13-foot-wide cat will have have a 55-foot running surface that includes a 78-inch tunnel. Hledin built the plug for the mold himself by hand in his rare "free" moments, hence the time it took to complete the project.
SMG 50 Catamaran moulds for sale
- one piece hull mold - rotatable (it has to be cut on the aft part of the hull to fit in a container -) - high efficiency rudder mould 2pc ... Cougar Custom Boats 23MTR Catamaran Molds. Joe Naponiello, Apr 20, 2022, in forum: Boat Molds. Replies: 2 Views: 2,656. Steve bran Jan 3, 2023. Forum posts represent the experience, opinion, and view ...
List of districts in Russia
This is a list of districts of Russia.A district is an administrative and municipal division of a federal subject of Russia.Within the framework of administrative divisions, the administrative districts are on the same level of hierarchy as the cities of federal subject significance and may be further subdivided into towns of district significance, urban-type settlements of district ...
Tomsk topographic map, elevation, terrain
Name: Tomsk topographic map, elevation, terrain.. Location: Tomsk, городской округ Томск, Tomsk Oblast, Siberian Federal District, 634069, Russia ...
41' Catamaran Mold
Located in Tampa Bay area. 40' Catamaran hull mold for sale. Contact me with any questions. Also have a 41' boat mold for sale. Want information on the 41 mold please call me at 770-510-3490. Fiberworks, May 31, 2018.
Russia topographic maps, elevation, terrain
Russia • Visualization and sharing of free topographic maps.
39,34 and 29 performance cat molds for sale
Steve Ortega New Member. I have cat molds for sale new designs never in production .. designed and tool by the biggest names in the industry. All wide body with wrap around window .. call or text Steve @925-321-6717. 39' 500k. 34' 400k.
Tomsk topographic map, elevation, terrain
Name: Tomsk topographic map, elevation, terrain.. Location: Tomsk, городской округ Томск, Tomsk Oblast, Siberian Federal District, 634000, Russia ...

DIY Cruising Catamaran: Complete Building Guide

Why You Might Want To Build Your Own Catamaran

Knowing Your Boat

Pride of Ownership

Substantial Cost Savings

Freedom To Create Your Own Designs

Great Learning Experience

What To Look For in Catamaran Boat Designs

How Much Would It Cost To Build Your Own Catamaran?

What You Will Need

How To Build a Catamaran

Prepare the Essentials

Build the Mast Beam

Build the Boat Hull

Sheathe the Hull

Install the Bulkheads

Construct the Interior Structure

Launch Your Cruising Catamaran

The Pros of Building a Catamaran

The Cons of Building a Catamaran

DIY Cruising Catamaran Tips and Tricks

Final Thoughts

One thought on “ DIY Cruising Catamaran: Complete Building Guide ”

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Recent Posts

Building expertise: our catamaran construction principles

Safety, reliability, performance, comfort, and pleasure are the key words throughout the design of an Outremer blue water catamaran.

Resisting the test of time and continuous improvement

Combining comfort and pleasure of sailing

Unparalleled quality of life onboard

Easy sailing and fun for all

Architecture

Catamaran construction principles: how are Outremer multihulls made?

Catamaran molds shipped from factory

Recent Posts

Catamaran Hull Design

Part 1: Notes from Richard Woods

Richard Wood’s comments on catamaran design:

2 replies on “Catamaran Hull Design”

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Category: Our Catamaran Build Kits

Quality suppliers & manufacturers

Batteries, Power Management

LITHIUM POWER (VIC)

Technical Information

Kit Materials Contents

What do I actually receive?

DUFLEX PRE-LAMINATED PANELS

KINETIX LAMINATING RESIN & HARDENER

WEST SYSTEM EPOXY RESINS

FIBREGLASS TAPES (DOUBLE BIAS)

CARBON FIBRE CLOTH

FIBREGLASS CLOTH

Material Choices

CORES Which One to Use?

BALSA END GRAIN (150 kg/cubic metre)

Secondary Issues

Multihullblog

2 thoughts on “37/40 Catamaran Molds”

Leave a Reply Cancel reply

Catamarans and Trimarans with Kurt Hughes

Yamalo-Nenets Autonomous Okrug

Zabaykalsky Krai

Rostov Oblast

Sverdlovsk Oblast

Tula Oblast

Tarumovsky District

Beloglinsky District

About this place

Log in or Sign up

39,34 and 29 performance cat molds for sale

Steve Ortega New Member

Steve bran New Member

Looking for high performance 30-34' cat hull molds for sale

Looking for 28' performance cat molds

44ft performance cruising catamaran hull mold (sailing)

52ft Performance Sailing Catamaran Male Plug

18' High Performance Flats Boat Molds

25' Malstrom x 8'9" beam Hi Performance 23' Closed deck