catamaran plan b

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Open Source 13-15m Catamaran Plans

Discussion in ' Projects & Proposals ' started by archie1492 , Jan 3, 2018 .

archie1492

archie1492 Junior Member

Dear all, I want to create a detailed building information model for a 13 - 15 meter catamaran that is capable of being CNC cut and assembled. I need some help finding plans I can use as a basis of design. Specifically, I need the hull profile information. Section cuts through the hull will give me the ideal contours for a boat of this size. Can someone help? After weeks of searching, I still cannot find these online. For now, this is merely an exercise in my 3d modeling capability. I'd like to share my drawing work with the forum if I can get some assistance to start off. There are future possibilities I am also considering. I'm an experienced Architect & construction designer with a strong background in computer aided design. Once I've modeled the boat in 3d, I would like to flatten the various parts and create plans for the individual boat parts to be CNC cut. I would like to build a small scale model first (1:2o or perhaps 1:10) with the ultimate goal of building the boat full scale.  

TANSL

TANSL Senior Member

This is a very simple catamaran which, if you are interested, I can give you a lot of information. It is not a spectacular boat but it can help you in your first steps with boats. LOA = 16 m, Lbp = 14.6 m  
Thanks I really appreciate it. The hull lines for the motor cat you've provided are not quite what i'm looking for. I'm specifically looking for the hull lines for a 14m catamaran sail boat. I guess there is some standard for these contours especially the area below the waterline. Check the attached document as well if anyone is interested in this.  

Attached Files:

catdimension.pdf

catdimension.pdf

I'm sorry, you never specified that it was a sailing catamaran. I thought that to carry out your purposes, " For now, this is merely an exercise in my 3d modeling capability ", any model was valid. Apparently, you have different purposes than, in addition to, to practice with 3D models. The better you clarify what you are really looking for, the better someone can help you.  
Hi all, Here's an example of what kind of information I need to get started. Optimising Hull Lines for Performance https://www.graingerdesigns.net/the-lab/optimising-hull-lines-for-performance/ The boat shown here is a 8.5m cat sailboat. I'm looking for something a bit larger in the 14m range. Also, the images only show one of the hull profiles. I'd like profile lines for the entire boat. I will post some other images I've found online showing profile lines for smaller boats. I still cannot find any 14m hull lines. Can anyone help?  

grainger_1488019480.jpg

Grainger_1488019410.jpg, grainger_1488019333.jpg, grainger_1488019265.jpg, grainger_1488019219.jpg.

Here are some other hull lines I've found online. Hope this is useful to anyone else looking for this information. Thanks!  

Evergreen Lines small.jpg

Hull-lines.jpg, shark-20.jpg.

You could take any of those boats and scaleb the lines to get the desired length. Since it is only a 3D modeling exercise, you do not have to worry about anything else. You could even make a mix of 2 or 3 of those models to get the one you are looking for.  
Thanks Tansl, I'd like to make the boat drawings accurate for the 14m size. Perhaps one day I will develop this into something worth building full scale. The more accurate I can draw the boat, the more I will learn about the boat design.  
Maybe it does not look like it but I would like to help you. If you do not find what you want on the Internet I could draw a lines plan, strictly following your instructions, which would help you to make the 3D model. Or, if you find something similar on the internet I can adapt it to your needs and fill in the information that you indicate you need for your work. I insist that starting from the shapes of a 10 m boat you can get the shapes of a boat of 14 m, with total accuracy.  

Dolfiman

Dolfiman Senior Member

archie1492 said: ↑ I'd like to make the boat drawings accurate for the 14m size. Perhaps one day I will develop this into something worth building full scale. The more accurate I can draw the boat, the more I will learn about the boat design. Click to expand...

Cata 14m with Gene-Hull UE Catamaran 2.3_2018 01 15.ods

Cata 14m with Gene-Hull UE Catamaran 2.3_2018 01 15.ods

Gene-Hull Catamaran 2.3 User Guide_2018 01 16.pdf

Gene-Hull Catamaran 2.3 User Guide_2018 01 16.pdf

Hull for cata 14m with Gene-Hull UE Catamaran 2.3_2018 01 16.pdf

Hull for cata 14m with Gene-Hull UE Catamaran 2.3_2018 01 16.pdf

Dolfiman, thanks so much! This is exactly what I was looking for. It's very interesting and probably a bit over my head at this point. I think this should work for modeling the basic hull shape. For the bridge deck and all of the stuff above the hull I can model this with a bit more creativity. Although, I'd like to learn more about understanding the center of gravity for the boat and the proper location of the mast. Are there any rules of thumb about this? Thanks again!  
archie1492 said: ↑ I think this should work for modeling the basic hull shape. Click to expand...

Cata 14m V2 with Gene-Hull UE Catamaran 2.3_2018 01 15.ods

Cata 14m V2 with Gene-Hull UE Catamaran 2.3_2018 01 15.ods

In complement to illustrate this first approach, my good friend Alain did some 3D views here attached of the hull V2 version with Multisurf (using fit for purpose ouput data in section 5. of the above file). To inspire you , some other examples of cata, more sport/day sailer oriented than the Saona 47 : - R/P 45 (Reichel-Pugh) : multihull http://reichel-pugh.com/tag/multihull/ - Dazcat 1295 : in this video, from 1:45 the launch, you can see the hulls from various angles https://www.youtube.com/watch?v=0BZF4Udda5E - SIG 45 (VPLP design) : from 1:20 you can see the winward hull fully lifted ​  

dean 1962

dean 1962 New Member

archie1492 said: ↑ Dear all, I want to create a detailed building information model for a 13 - 15 meter catamaran that is capable of being CNC cut and assembled. I need some help finding plans I can use as a basis of design. Specifically, I need the hull profile information. Section cuts through the hull will give me the ideal contours for a boat of this size. Can someone help? After weeks of searching, I still cannot find these online. For now, this is merely an exercise in my 3d modeling capability. I'd like to share my drawing work with the forum if I can get some assistance to start off. There are future possibilities I am also considering. I'm an experienced Architect & construction designer with a strong background in computer aided design. Once I've modeled the boat in 3d, I would like to flatten the various parts and create plans for the individual boat parts to be CNC cut. I would like to build a small scale model first (1:2o or perhaps 1:10) with the ultimate goal of building the boat full scale. Click to expand...
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Archie, I have been looking to do the same thing. Where are you at on the project? Very interested in hearing all about it. Thanks.  

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Catamaran Design Formulas

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

catamaran plan b

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

catamaran plan b

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

Rick

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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  • Aluminum Boat Plans

21 FT Catamaran B (1847)

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This design (plan) is a 21 FT aluminum catamaran.

At 3,047 lbs. displacement with 26 gallons of fuel, at 70 HP, the boats projected speed is 24 knots.

*The above price is for the construction plans and a onetime use of the CAD cutting files.

Weight in table above is the weight of the uncut aluminum sheet and plate.

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catamaran plan b

catamaran plan b

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!!

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New Gemini Legacy 35

GEMINI SALON comfortable seating for 6 and easily transforms into a bed for overnight guests.

The two different cockpit configurations on the Gemini Legacy mean you can configure your boat for your lifestyle.

The hammock configuration provides a relaxing place to recline while the cockpit bench seat allows for more storage and a great place to sit up and take in your surroundings or enjoy a meal on the cockpit table.

Satisfied sailing

Made in America since 1981, the Gemini Legacy has proven to be the most family-friendly performance cruising catamaran in the world, and the reasons are obvious;

  • A 34 inch draft that allows the boat to be pulled up right next to a beach or anchored in small, protected coves.
  • A 14 foot beam, which means the boat can be trucked anywhere in the country, hauled out of the water with a standard size travel lift and kept in a standard size slip.
  • Costing no more than an average mid-size monohull, the Gemini Legacy 35 has more interior volume than most 40-foot monohulls.
  • Fast, level sailing. Imagine moving along at wind speed with virtually no heeling. your drink stays on the table and you stay comfortably reclined in your seat. Plus, with the upgraded engine option, you can get home quicker after sailing too.
  • Fast, family friendly, easy to maneuver, and affordable.

All the reasons this boat has been an American Legacy since 1981. The Gemini Legacy 35 is the most successful cruising catamaran ever built.

Master Cabin bed

Master Cabin

The master cabin of the Gemini Legacy 35 is one of the best owner's cabins in the sailing industry. A full queen-sized bed with a spectacular view through panoramic windows. Beautifully crafted cabinetry with dressing table and sitting area plus three opening hatches for ample ventilation make this cabin a home away from home.

A large forward storage cabinet with beautiful glass front doors accents unrivaled storage in this cabin.

The "owners hull" configuration with the head in the back of the same hull as the master cabin means accessibility, privacy and convenience.

Aft Cabin

The aft cabin of the Gemini Legacy 35 is roomy and spacious with beautiful cabinetry for storage and over 6 feet of headroom. A 50-inch wide double bed with lots of light and air flow from two opening hatches.

Galley

The galley of the Gemini Legacy 35 is exceptionally spacious. The storage and counter space easily rival that of a 45-foot monohull and even some 40-foot catamarans. A two-burner stove with oven and broiler, a two-sided sink with pullout spray faucet, a 3.8 cubic foot fridge with freezer, optional microwave, dedicated trash can holder and over 12 feet of stunning Corian counters make the galley of the Legacy 35 worthy of simply being called a kitchen!

Nav Station

Roomy with lots of storage and a well laid out electrical panel; this space is extremely functional and beautiful at the same time.

Head

With a full standing shower and plenty of cabinet storage the standard head on the Gemini Legacy 35 is functional, easy to maintain and beautifully appointed. The space is made with a composite molded unit that keeps maintenance to a minimum. Optional Quiet Flush toilets and additional medicine cabinets add to the appeal of this private space.

Crew Cabins

The forward cabin on the Gemini Legacy 35 offers a multitude of options that allow you to configure the boat for your particular use. The cabin can be either a second head with a large storage area, a third double cabin or a 'crew cabin' configuration that combines the two.

Gemini Ownership Options

Gemini Catamarans offers more ways to own your dream boat than any other yacht manufacturer in the world. We have partnerships with charter companies and the fractional ownership company, SailTime, that allows you to purchase your Gemini in the way that suits your needs most and even change them later if your needs change.

Charter Income Opportunities: The Catamaran Company • SailTime • Bay Breeze Yachts • West Coast Multihulls

Charter Opportunities

Try our Gemini Catamarans available for charter in Tortola, BVI.

See More • Request A Legacy 35 Charter Business Plan

History of Gemini Catamarans

Proudly Made in America Since 1981

In 1981 the very first Gemini Catamaran was launched and at the time no one knew it would start a legacy. With the introduction of this boat the market experienced the complete redefinition of the mid-sized performance cruising boat. There have been more than 1,100 Gemini Catamarans built since its inception.

In October, 2013 the Gemini Legacy 35 was introduced; keeping all the best qualities of a Gemini; her narrow beam, performance sailing ability, and shallow draft, but simplifying some of the systems to appeal to a cruising family.

Throughout all the years of building the Gemini Catamaran, the one constant was that they are all proudly made in America. Starting in a small town called Mayo, Maryland, then moving to the heart of Annapolis, Maryland in 1997. Then, in a mutually beneficial arrangement that helped both companies survive the great recession, Marlow-Hunter began subcontract building the Gemini for Gemini Catamarans in 2010.

The result of this arrangement has meant that the Gemini Legacy has the most advanced research and development in American boat building and the most highly skilled production team, combined with the history and catamaran design knowledge of Gemini Catamarans. All of these things have created one of the most obtainable, easy to use, fast, and fun cruising catamarans on the market today.

Gemini 1980s

Deck and Rig

The fore and side decks of the new Gemini Legacy 35 are clean, safe, uncluttered and very easy to use whether you are going forward or just relaxing in the sun or on the bow seats. The profile of the Gemini deck is designed to maximize both form and function. The three levels of the deck; starting with the foredeck and moving up to the cabin top then to the pilot house, all work to create a sleek profile and keep the center of effort low. This low profile not only looks great but also contributes greatly towards the lack of heeling.

Foredeck

The rig of the new Gemini Legacy 35 takes advantage of the most advanced technology available in cruising catamarans today. The swept back spreaders mean strength and safety without all the clutter and additional hardware of a backstay. Eliminating the backstay also allows for a square top mainsail that puts more sail area at the top of the mast. This is where the cleanest, purest wind blows; uninhibited by objects on the water or on the boat itself, so performance is maximized in every condition. Easily getting up to 35 degrees off the wind and reaching ¾ wind speed without even trying, the Gemini Legacy makes sailing fun and easy again.

First introduced on the original Gemini 105M, the hull shape of Gemini Legacy 35 is still revolutionary in the multihull industry. The hulls are shallow and shaped much like a “teardrop” which requires little force to move them through the water yet it also provides a high load carrying capacity (450 lb per hull per 1″). The bridge deck has 39″ of clearance at the bow. This, combined with the lack of pitching and wave making, translates to a comfortable ride with no heeling. The shape has been tested and proven in a wide variety of conditions… surfing down 30′ waves in the mid-Atlantic, sailing to Hawaii, or cruising down the Intracoastal Waterway.

Hull

The Gemini hulls provide many advantages considering their weight and structural rigidity. The entire hull mold is one complete unit including the keels. This single unit eliminates any secondary bonding down the keel or at the bridge deck, making for a far stronger hull. The result is a faster, stronger, and more stable platform that provides excellent sailing performance.

The twin 15 HP Yanmar diesel engines make maneuvering the boat easy and safe in any condition and the upgrade option to twin 30 HP Yanmars means even more power and a quicker ride back to the dock.

Specification Sheet

Layout 1

Custom Options

Sailing panorama

With the Gemini Legacy 35 you can choose from many factory-installed options to make your boat truly yours! Below are some of the items we offer:

  • Upgrade To Twin 30HP Yanmar Engines
  • Cockpit, Bow and Bench Cushions
  • Cockpit Bench Seat (including Large Storage Locker and 5 Gallon Propane Tank
  • Custom Helm Seat
  • Cockpit Table
  • Antifouling Bottom Paint
  • Upgrade to Stack Pack
  • Electric Anchor Windlass
  • Raymarine Autopilot with i70 Display
  • Raymarine i60 Wind
  • Raymarine i50 Tridata
  • U.S. VHF Radio
  • Battery Charger
  • CD Stereo with Speakers in Salon
  • Cockpit Speakers
  • Upgrade Batteries to Group 31 (95 Amphr) Batteries
  • Fans in Cabins and Salon
  • Custom Window Shade Package
  • Upgrade to i70 Tridata
  • Interior Cushion Upgraded Fabric
  • Solar Panel
  • Custom Coffee Table
  • Master Cabin Display Cabinet with Glass Front Doors
  • Interior Backsplash and Main Bulkhead Wallpaper Upgrade
  • Upgrade All Interior Lights to LED Fixtures
  • Additional 12V Outlets in Cabins (2 in Salon as standard)
  • 2 Reading Lights in Salon
  • Code Zero with Retractable Bow Sprit on Roller Furling
  • 110V Inverter
  • Quiet Flush Electric Head (each)
  • 4.2kW Fisher Panda Diesel Generator
  • 110V Air Conditioner in Salon and Cabins
  • VHF Remote Microphone
  • CW90 Display with GPS
  • 26" Flat Screen TV with DVD/Stereo
  • 110V Microwave Oven
  • Wireless Autopilot Remote
  • Curtains on Large Pilot House Windows
  • OceanAir Hatch Blinds
  • Upgraded Long Distance, Heavy Weather Autopilot System
  • Cockpit Enclosure with Isenglass and Bugscreens
  • Dinghy Davits

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Secondary Transition Information

Secondary transition is the process of preparing youth aged 16 with an Individualized Education Program (IEP) to meet their postsecondary goals of education, training, employment, and independent living.

For more information about the related indicator and determinations element, see  Understanding the Part B Strand Report  and  Determinations .

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  • Questions and Answers from the B-13 Data Collection Webinar (March 2022)
  • SPP B-13 Manual (January 2024)

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  • Sailboat Guide

1989 HUGE PRICE REDUCTION – Privilege 48 – Plan B

  • Description

Seller's Description

This beautiful 1989 Privilege 48 Sailing Catamaran is available for sale, located on the hard on the Gold Coast, Queensland, Australia.

Plan B her name, has tremendous quality, elegance, and impressive equipment. Plan B is set up for liveaboard cruising, sailing with family and friends, island hopping up North Queensland or sailing the world.

This spacious Privilege 48 represents what a true sailing yacht should be. Plan B has already sailed the world, and she is setup to do it again! Privilege vessels are renowned for their strength, high quality and class - Plan B is no exception.

There are so many extras to list them all. You must see this vessel to truly appreciate her expansive inventory. A recent out-of-water Survey is also available for any interested party.

The cherry on top, is a generous invitation from the current owner to give 6-8 weeks handover assistance to new owner, and be crew on <500 NM trip if required.

  • Out of water Survey Report 2022 available on request
  • Antifoul February 2022
  • Under motor at 2500 RPM – 7-8 knots with neutral tide. Using 3 litres of fuel per hour for both engines.

Sailing 7-14 knots with 15-20 knot winds.

  • Hull Material – Composite GPS-25mm foam sandwich moulded & hand laid vacuum infused topsides & solid hull under the waterline.
  • Cabin and Deck – Moulded & hand laid composite foam, vacuum infused deck.

Interior – Beautiful finish, Rosewood marine varnished timber.

  • 2 x 12 volt MFM70 sealed cranking batteries and 6 US2200 6 volt lead acid house batteries
  • Westerbeke – 3 cylinder diesel generator
  • Service history available
  • Aircon – Dual Systems – Climma

Rig and Sails

Auxilary power, accomodations, calculations.

The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.

Classic hull speed formula:

Hull Speed = 1.34 x √LWL

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL

Sail Area / Displacement Ratio

A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.

SA/D = SA ÷ (D ÷ 64) 2/3

  • SA : Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
  • D : Displacement in pounds.

Ballast / Displacement Ratio

A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.

Ballast / Displacement * 100

Displacement / Length Ratio

A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

  • D: Displacement of the boat in pounds.
  • LWL: Waterline length in feet

Comfort Ratio

This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam 1.33 )

  • D: Displacement of the boat in pounds
  • LOA: Length overall in feet
  • Beam: Width of boat at the widest point in feet

Capsize Screening Formula

This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.

CSV = Beam ÷ ³√(D / 64)

The Privilege 48, also called the Privilege 14.7 and introduced in 1987, closely resembles the Privilege 47 which it replaced. Like its predecessor, the 48 was intended, primarily, for the charter trade.

This listing is presented by MultihullCentral.com . Visit their website for more information or to contact the seller.

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Plan B Charter Yacht

NOT FOR CHARTER *

This Yacht is not for Charter*

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PLAN B yacht NOT for charter*

23.16m  /  76' | lazzara | 1995 / 2013.

Owner & Guests

Cabin Configuration

  • Previous Yacht

Special Features:

  • Two VIP cabins
  • Cruising speed of 23 knots
  • Sleeps 10 overnight
  • Shallow draft and fast speeds for reef exploration

The 23.16m/76' motor yacht 'Plan B' (ex. Naut E Lady) was built by Lazzara in the United States. She was last refitted in 2013.

Guest Accommodation

Plan B has been designed to comfortably accommodate up to 10 guests in 5 suites comprising two VIP cabins.

Range & Performance

Powered by twin diesel MTU (12V 183 TE) 12-cylinder 1,150hp engines, she comfortably cruises at 23 knots, reaches a maximum speed of 25 knots. Her low draft of 1.37m/4'6" makes her primed for accessing shallow areas and cruising close to the shorelines. Her water tanks store around 350 Gallons of fresh water.

*Charter Plan B Motor Yacht

Motor yacht Plan B is currently not believed to be available for private Charter. To view similar yachts for charter , or contact your Yacht Charter Broker for information about renting a luxury charter yacht.

Plan B Yacht Owner, Captain or marketing company

'Yacht Charter Fleet' is a free information service, if your yacht is available for charter please contact us with details and photos and we will update our records.

Plan B Photos

Plan B Yacht

NOTE to U.S. Customs & Border Protection

Specification

M/Y Plan B

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IMAGES

  1. 2004 Leopard 47 Catamaran PLAN B-10

    catamaran plan b

  2. 2004 Leopard 47 Catamaran PLAN B-12

    catamaran plan b

  3. 2004 Leopard 47 Catamaran PLAN B-14

    catamaran plan b

  4. 2004 Leopard 47 Catamaran PLAN B-11

    catamaran plan b

  5. 2004 Leopard 47 Catamaran PLAN B-7

    catamaran plan b

  6. Leopard 47 Catamaran PLAN B Sold by Just Catamarans

    catamaran plan b

COMMENTS

  1. Catamaran Stock Plans

    The DESIGNER'S book TRIMARAN and CATAMARAN CONSTRUCTION is part of the plans (over 21') and covers all phases of construction. Plans are leased to build ONE boat, NO time limit. Tri-Star designs are proven designs, sailing the seven seas since 1964. Free consultation is provided to the original non-professional builder till he or she is sailing ...

  2. Plans For Catamarans And Monohulls

    YACHT DESIGN. We provide stock boat plans for both monohull and multihull sailing vessels, including sailing skiffs and sharpies. Our designs mainly feature timber construction, in plywood or cedar strip plank composite construction, using the W.E.S.T. system (wood epoxy saturation technique). Our designs are intended mainly as cruising boats ...

  3. Plan B Catamaran LEOPARD 47' 2004

    Plan B 2004 LEOPARD 47 Catamaran Yacht MLS #353787 < Back to search Overview Features Details Gallery. Call Broker Email Broker. 2004 . Year LEOPARD . Builder 47' (14.33m) Length 4 . Cabins Plan B 2004 47' LEOPARD Catamaran Fort Pierce United States $359,000 USD ...

  4. Leopard 47 Catamaran PLAN B Sold by Just Catamarans

    Just Catamarans announces the sale of a Leopard 47 Catamaran built in 2004. PLAN B was sold by Just Catamarans broker Larry Shaffer who represented the Buyer in the sale. This is a four-cabin version Leopard 47. With a rig that delivers easy handling and top performance and an immense cockpit for relaxing and entertaining, the Leopard 47 catamaran will take you to a world of pleasures few have ...

  5. Open Source 13-15m Catamaran Plans

    I can propose you the spreadsheet application Gene-Hull attached, hull generation for early stage project. I have just finalised a version dedicated for hull of catamaran and took your spec. for a first test : Loa 14,00 m ; Lwl 12,75 m ; B 1,80 m ; Draft 0,75 m (at 38 % Lwl ) ; ....

  6. Photos of LEOPARD Catamaran Plan B

    Plan B is a quality 47' (14.33m) Catamaran built by LEOPARD and delivered in 2004. Discover the Plan B photo gallery below.

  7. Catamaran Design Formulas

    T c = 0.57. Here we put B TR = 1.9 to minimize boat resistance (for her size) and get the draft calculation for a canoe body T c (Figure 1). Midship coefficient - C m. C m = A m / T c (x) B WL. We need to estimate a few coefficients of the canoe body. where A m is the maximum cross section area of the hull (Figure 3).

  8. Boat Plans

    Purchase Plans. This easy to build catamaran is intended to allow anyone, no matter their background, to build a modern cruising multihull with a thrilling performance and an appealing design with a small budget. The Bora-Bora 28 has a very practical interior lay-out with accommodation inside the hulls and a large platform to be used as a sundeck.

  9. PLAN B Yacht

    Three VIP cabins. Germanischer Lloyd 100 A5 Motor Yacht, MC AUT classification. Up to 25 crew. The 73.15m/240' motor yacht 'Plan B' was built by ADM Shipyards in the United Arab Emirates at their Kiel shipyard and she was delivered to her owner in June 2012. This luxury vessel's exterior design is the work of Focus Yacht Design.

  10. 21 FT Catamaran B (1847)

    21 FT Catamaran B (1847) This design (plan) is a 21 FT aluminum catamaran. At 3,047 lbs. displacement with 26 gallons of fuel, at 70 HP, the boats projected speed is 24 knots. *The above price is for the construction plans and a onetime use of the CAD cutting files. Weight in table above is the weight of the uncut aluminum sheet and plate.

  11. Bruce Roberts, CATAMARAN boat plans, CATAMARAN boat building

    Fast cruising ALUMINUM CATAMARAN . BOAT PLANS & FULL SIZE PATTERNS - Package Includes latest sail boat plans, SAILBOAT building plan updates & revisions, PLUS direct contact with the designer. This CATAMARAN was designed for personal use or charter work and the accommodation was laid out with that in mind.

  12. Catamaran and Trimaran Boat Plans

    However with all things considered, building a multi can be an amazing journey. Fast Twin Catermaran. $ 30.00 - $ 45.00 (USD) Lively 28 Cruising Trimaran. $ 170.00 - $ 185.00 (USD) Lively 35 Cruising Trimaran. $ 355.00 - $ 370.00 (USD) Catamaran & Trimaran Boat Plans from Hartley Boats make it a reality to build your own multihull at home.

  13. Boat Building Plans

    Classic Designs. Boat Building Plans. The 'Classic Designs' are recognised as beautiful, safe boats - easy to build, easy to sail, sturdy and stable. Many anchorages around the world are graced by these Classic Designs, and nine are still available, from the 16ft Maui to the 51ft Tehini. They were the first range of Wharram catamarans, designed ...

  14. 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.

  15. Plans & Kits

    The Rodcat 5 is a simple beach catamaran with asymmetric hulls. To make construction quick and easy, each hull is built up from a flat inboard side which is laid flat on a workbench. The transom and ply bulkheads are then fitted to this side and the... $101.00. Choose Options. Qty in Cart: 0. Price: $101.00 ...

  16. 2014 Gemini Legacy 35 Brochure

    See More • Request A Legacy 35 Charter Business Plan. ... In 1981 the very first Gemini Catamaran was launched and at the time no one knew it would start a legacy. With the introduction of this boat the market experienced the complete redefinition of the mid-sized performance cruising boat. There have been more than 1,100 Gemini Catamarans ...

  17. Catamaran BALI 5.4

    The BALI 5.4 Open Space is characterized by completely open spaces and very ergonomic living spaces. In addition to the recognized innovations such as the rigid front cockpit with lounge area and sunbathing, the new platform linking the two rear skirts with large bench and chests, the large tilt-and-turn door and sliding windows, a panoramic relaxation area on the roof.

  18. Secondary Transition

    Secondary transition is the process of preparing youth aged 16 with an Individualized Education Program (IEP) to meet their postsecondary goals of education, training, employment, and independent living. For more information about the related indicator and determinations element, see Understanding the Part B Strand Report and Determinations.

  19. Podcast

    It is only a matter of time before this soon-to-be-lucrative podcast changes that sad fact. The James Donald Forbes McCann Catamaran Plan podcast exists for one reason: to generate enough money for catamaran ownership. Yes, James can see the boat now, glimmering, as though in a vision. He could almost reach out and touch it.

  20. Leopard 47 boats for sale

    Find Leopard 47 boats for sale in your area & across the world on YachtWorld. Offering the best selection of Leopard boats to choose from.

  21. 1989 HUGE PRICE REDUCTION

    Seller's Description. This beautiful 1989 Privilege 48 Sailing Catamaran is available for sale, located on the hard on the Gold Coast, Queensland, Australia. Plan B her name, has tremendous quality, elegance, and impressive equipment. Plan B is set up for liveaboard cruising, sailing with family and friends, island hopping up North Queensland ...

  22. Plans by designer

    The ECO 520 is the next catamaran from my jigsaw series. The first was the DUO 480 C. For study plans, click HERE The clue is, that the hulls can be build laying flat on a table. ... Note: This is the full plan, for the study plans click HERE The ECO 6 looks like the ECO55 cruiser, but it is a completely new design. The small increase of only 0 ...

  23. PLAN B Yacht

    Two VIP cabins. Cruising speed of 23 knots. Sleeps 10 overnight. Able to access shallow bays and coves. The 23.16m/76' motor yacht 'Plan B' (ex. Naut E Lady) was built by Lazzara in the United States. She was last refitted in 2013.