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Frame For SUP Catamarans

Catamaran SUP Frame

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Aluminum Catamaran Frame for Inflatable Paddle Boards.

Convert 2 paddle boards into an electric or sail catamaran..

Also can be used to install electric motor on single kayak, canoe or paddle board. See pictures for more details.

Great for pleasure cruising for 1-2 people or fishing. Heavy-duty set of 2 aluminum frames, designed to join together 2 inflatable SUP Paddle Boards to make catamaran type of vessel. Frames can be break down into smaller pieces for easy storage. Comes with transom on one of tubes, so that electric trolling motor can be installed on it.

Frame section with a transom can be installed in various ways, so that trolling motor can be installed in front, or in rear. In both configurations, location of transom can allow easy access to tiller handle of trolling motor for comfortable operation.

Various types of beach chairs or kayak seats can be installed on both SUPs for comfortable ride and enjoyment. If no D-rings available on a top of SUP paddle board to attach beach chairs, then chairs can be secured directly to frame tubes with tie downs.

This frame can also be used for DIY project of converting 2 inflatable SUPs into sail catamaran. Please note that this is DIY project, and we do not provide detailed instructions. However, having 2 frames joining 2 SUPs or kayaks. it become possible to mount sail pedestal and keel on a front frame, and attach rudder or oar to rear frame, so that to create sail catamaran.

Frames attach to hulls of 2 paddle boards, placed side by side, by running 44" long x 1.5" wide tie down straps under hull of each SUPs, and securing to tie down clamps. Bottom of frames has rubber layer attached to it, so that to reduce slippage. Once frames installed to both SUPs, there might be some play in movements, which does not affect functionality or performance of catamaran going under power over waves. To make frame more rigid, install it while SUP only inflated about 60-80%, pull tie downs firmly, and then finish inflation. Flash with fresh water after use in salt water. Apply grease to thumb bolt to make disassembly easier.

If installing electric trolling motor in front of catamaran, rotate tiller handle 180 degree for comfortable operation. To do that, remove screws holding top housing of trolling motor, rotate it 180 degree and then re-install screw back. If installing trolling motor in rear, do not install fins on paddle boards, to make catamaran more responsive for turns.

  • Shipping Weight: 18.5 lbs.
  • Shipping size: 24"x17"x5"
  • Product weight: 17 lbs.
  • Stainless steel hardware included.
  • Assembly Instructions available.
  • Straps 44" long x 1.5" wide.
  • Provided straps will works with all inflatable SUPs up to 32" wide.
  • Frame designed to be used with electric trolling motors up to 55lbs thrust.
  • Longer webbing straps can be purchased on Amazon to wrap around wider SUPs or canoes or kayaks.

Unboxing and assembly of Catamaran Frame.

Testing SUP Catamaran tested with 3HP and 55Lbs Electric Motor.

DIY modification to use motor on single SUP or kayak.

Make catamaran out of 2 inflatable SUP paddle boards.

Videos of Catamaran Frame Test with 2 different SUP Paddle Boards

catamaran frame

Assembly Manual (Catamaran-Frame-Assembly-Manual.pdf, 507 Kb) [ Download ]

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Schionning Designs International Pty Ltd Leaders in Multihull Design and Kit Development.

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.

BUILD YOUR RAKU CAT WITH A DuFLEX KIT BY FOLLOWING THESE NINE BASIC STEPS

Duflex Kit Construction Step.1

Step 1. Kit Design

Work with us to finalise the details of the design you have chosen including any design options or additional modules to be included in the kit.

We will determine the laminates, the number of panels required for each laminate, create the cutting files and prepare a quote for the kit if it is not already priced.

Once the design details and pricing are confirmed you are ready to place your order.

Duflex kit construction Kit image-01

Step 2. Unpacking

2. The kit arrives at your workshop door, usually by container, as a stack of 1.2m x 2.4m routed composite panels ready to be joined. The shipment will normally include additional reinforcements, resins, and ancilary products as specified.

Unpack the shipment and stack the panels out of the way of the space where the panels will be joined.

If you have purchased a joined kit many of the panels will already be joined up to the length that can be shipped in a container (12m).

Duflex Kit Construction Step 2 image-02

Step 3 Joining the Panels

Set up the work space where the panels are to be joined.

The panels have a scarf join called a Z join that facilitate the join without needing tapes.

The joining can be done with a heated Z press that cures the epoxy join quickly. Alternatively they can be joined with clamping pressure.

If the panel are are being joined with the Z press you will need an elevated work bench the full length of the longest panels you are using. (image below).

If you are joining them with a clamping technique the space can be on the factory floor.

A nesting booklet is provided with the kit to show how the panels are joined (right)

Duflex kit construction Step 3 image-01

Joining the panels with  clamping pressure

catamaran frame

Panels are being joined into a single long panel by painting the surfaces of the scarf join with epoxy screwing through plywood battens that have a release film applied to one side.

Joining the panels with the Z Press

catamaran frame

Step 4 Stacking Joined Panels

Once the joins are cured the panels are stacked to one side until they are needed for the job. The inividual parts should not be cut free of the panels until they are required.

Bulkhead and floor panels will be needed before the hull sides and cabin top so they should be left to the front of the stack wherever possible.

Diuflex Kit Construction Header image step 5.

Step 5. Separating the Parts

When assembly is ready to begin the individual parts are separated from the panels by cutting the joining tabs. It is likely you will be building onto moulded hull bottoms that have been built from strip planking or another method of building moulded components. The process for building moulded components is described in another article.

Duflex kit Construction Step 5 Image-01

Step 6. ASSEMBLY

As the joined panels are assembled onto the job you will need to apply glass tapes to the joins as specified in your plans.

Panels can be surfaced and coated inside and out with high build while they are on the workshop floor to minimise fairing time once they are assembled to the boat. The paint on the panels shown here has been kept back from the edges to provide a good bond for the tapes.

Duflex Kit Construction Assembly image-01

Smaller items such as steps, seats and dagger cases are nested into the kit and for the more complex parts diagrams are provided to assist with the assembly process.

Duflex Kit Construction Header Image Step 7

Step 7. Interior

Interior kits can be ordered with the primary kit, or they can be ordered later when final decisions have been made about the interior arrangement.

A compromise solution is to order the interior as a set of plain planels that can be cut to shape on site after finalising the layout.

Duflex Kit Construction Step 7 Image 2

Step 8 Fairing, Painting, Hardware Installation

8. The DuFLEX construction process goes a long way to minising the amount of fairing that has to be done, but inevitably any boat that has not come out of a female mould will require some level of fairing and surface preparation prior to painting. 

The fillers and resin systems required for the fairing work are normally supplied as part of the kit.

Hardware installation is the same as for any other form of construction using high density core inserts or consolidated laminate in way of fittings.

Duflex Kit Construction Step 8 Image 2

Step 9. Sailing

Go Sailing. This Barefoot 40 Catamaran was built entirely with a Duflex kit in Foam/Glass and Epoxy resin systems from ATL Composites

catamaran frame

DuFLEX Kits are manufactured and supplied world wide by ATL Composites

atlcomposites.com.au

And in Europe by VDL Composites

www.vonderlinden.de/her/28/vdL-Composites-GmbH

For more information on DuFLEX and associated Products 

atlcomposites.com.au/category/27/DuFLEX

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Catamaran Stand Up Paddle Board (SUP)

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Introduction: Catamaran Stand Up Paddle Board (SUP)

Catamaran Stand Up Paddle Board (SUP)

Step 1: Foam

Foam

Step 2: Cut Foam

Cut Foam

Step 3: Place Pieces Together

Place Pieces Together

Step 4: Glue

Glue

Step 5: Cut Upper and Bottom Parts

Cut Upper and Bottom Parts

Step 6: Glue

Glue

Step 7: Second Pontoon

Second Pontoon

Step 8: Middle Piece

Middle Piece

Step 9: Deck

Deck

Step 10: Shape

Shape

Step 11: Get Rid of 90 Deg Corners

Get Rid of 90 Deg Corners

Step 12: Glassing

Glassing

Step 13: Add Fin Boxes

Add Fin Boxes

Step 14: Paint

Paint

Step 15: Design

Design

Step 16: Glass/epoxy

Glass/epoxy

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How to Build a Catamaran Boat? (Step-by-Step Guide)

catamaran frame

Building a catamaran boat from scratch is a rewarding and challenging endeavor.

It takes a combination of skill, dedication, and hard work to craft a seaworthy vessel.

In this step-by-step guide, you’ll learn how to design and size your catamaran, gather the necessary materials, cut and assemble the pieces, lay fiberglass and apply epoxy, make finishing touches, add hardware and paint, and rig the boat.

With the right tools, planning, and patience, you can make your dream of sailing in a catamaran a reality.

Table of Contents

Short Answer

Building a catamaran boat requires a lot of patience and skill.

The first step is to choose the right materials for the hull, such as fiberglass, wood or aluminum.

Then, you will need to build the frame of the boat, which includes the crossbeams and the main hull.

After that, you will need to install the decking, the rigging, and other components.

Finally, you will need to paint and varnish the boat, as well as install the outboard motor and other accessories.

Design & Size Considerations

When it comes to building a catamaran boat from scratch, the first step is to determine the design and size of the boat.

This should take into account the intended use of the boat, such as sailing, fishing, or leisurely cruising.

The size of the boat will depend on the number of passengers and the type of activities the boat will be used for.

For instance, a larger boat may be needed if passengers will be standing or participating in watersports.

The design of the boat is also important and should be chosen based on the intended use.

If you are looking to build a sailboat, you will need a design that is optimized for sailing.

On the other hand, if you are looking to build a fishing boat, you will need a design that is optimized for fishing.

There are a wide variety of boat designs available, so it is important to research and choose the one that best suits your needs.

In addition to the design and size, you will also need to consider the materials used for construction.

The most common materials for building a catamaran boat are wood, fiberglass, and epoxy.

Each material has its own advantages and disadvantages, so it is important to research them and determine which one is best for your project.

Finally, you will need to consider the cost of the project.

Building a catamaran boat from scratch can be a costly endeavor, so it is important to have a budget in mind before you begin.

The cost will depend on the type of materials used and the complexity of the design.

It is also important to factor in the cost of any tools that may be needed for the project.

By taking into account the design and size, materials, and cost of the project, you can be sure to build a catamaran boat that meets your needs and budget.

With the right amount of patience and attention to detail, you can build your own catamaran boat in no time.

Gathering Materials

catamaran frame

Gathering the materials needed to build a catamaran boat from scratch can be a daunting task, but it is essential for creating a sturdy and safe vessel.

Before starting the building process, it is important to have an accurate and detailed plan for the boats design and size.

Once a plan is in place, it is time to begin sourcing the necessary materials.

The most common materials used to construct a catamaran boat are wood, fiberglass, and epoxy.

When choosing wood, it is best to select a species of timber that is strong and durable, such as mahogany, teak, or cedar.

Additionally, the wood should be clear and free of knots, splits, and other defects.

Fiberglass is a lightweight fabric that is resistant to water and provides additional strength to the boats hull.

Epoxy is a waterproof adhesive that is used to seal the boat and ensure that it is watertight.

It is important to ensure that the materials are of high quality, as this will help to ensure the boats longevity.

Additionally, it is important to purchase the necessary materials in the correct amount and size.

Too little or too much of a material can be a costly and time-consuming mistake.

Finally, it is important to keep any leftover materials for future repairs or modifications.

With the right materials gathered, the next step is to cut the wood and begin the assembly process.

Cutting & Assembly

Cutting and assembly are the most important steps when it comes to building a catamaran boat from scratch.

The first step is to decide the design and size of the boat.

This will determine the type of materials you need to gather and the amount of effort that needs to be put into the project.

After deciding on the design and size, you will need to cut the wood to fit the design.

This includes cutting the wood to the desired size, as well as cutting any additional pieces that may be needed to complete the design.

It is important to ensure that all the pieces fit together correctly and securely, as any mistakes could lead to a weak boat.

Once the wood has been cut, it is time to assemble the pieces together.

This involves attaching the pieces together with glue, screws, and nails, and ensuring that the pieces fit together securely.

It is important to be careful and patient when assembling the pieces, as any mistakes could result in a weak and unstable boat.

Once the frame is ready, it is time to lay the fiberglass, and apply the epoxy to seal the boat.

This is an important step, as it will make sure that the boat is waterproof and durable.

Finally, you can add the finishing touches, such as the hardware, paint, and rigging.

With the right amount of patience and attention to detail, you can have your own custom catamaran boat in no time.

Laying Fiberglass & Applying Epoxy

catamaran frame

When laying the fiberglass and applying epoxy, it is important to take your time and be precise.

Fiberglass and epoxy are key components of a catamaran boat, as they provide the strength and waterproofing necessary to keep the boat afloat.

Start by laying the fiberglass over the frame of the boat.

Make sure to cut the fiberglass to size and overlap the edges for a strong seal.

Once the fiberglass is in place, mix the epoxy and begin to apply it.

It is important to apply the epoxy in a thin, even layer to ensure a proper seal.

Make sure to move the epoxy around to get it into all the nooks and crannies of the boat.

Allow the epoxy to cure and then you can begin to add the finishing touches.

Finishing Touches

Once the frame of the catamaran boat is built, it is time to add the finishing touches.

This includes adding the necessary hardware, painting, and rigging the boat.

Hardware: Before adding the hardware, it is important to ensure that the frame is stable and secure.

Add the appropriate hinges, screws, and nails to the frame.

Make sure that the screws and nails are the correct size and do not exceed the recommended load capacity of the frame.

Painting: Once the hardware is added, it is time to paint the boat.

Choose a paint that is suitable for the materials used in the construction.

Make sure that the paint is applied evenly and that the frame is completely dry before applying the next coat.

Rigging: The last step is to rig the boat.

This involves attaching the sails, running rigging, and standing rigging to the masts and booms.

Make sure that the rigging is properly tensioned and secured.

Once all of these steps are complete, your catamaran boat is ready to sail.

Hardware & Paint

catamaran frame

The last step in building a catamaran boat is to add the hardware and paint.

This step is often the most rewarding, as it is the finishing touch.

Depending on the design of your boat, there are various types of hardware you may need.

Some of the most common items are cleats, winches, fasteners, and decking.

After selecting the required hardware, you will need to install them on the boat.

It is important to use the correct type of screws and bolts, and to secure them tightly.

Once the hardware is installed, it is time to apply the paint.

The type of paint and color you choose will depend on the design of your boat.

It is important to use a high-quality marine grade paint that is designed to handle the extreme environment of the ocean.

If you are up to the challenge, you can add some custom artwork or detail to your catamaran boat.

Adding the hardware and paint is the final step in building a catamaran boat.

With patience and attention to detail, you can create a beautiful and unique boat that will last for many years.

Be sure to take your time and enjoy the process of constructing your own boat.

Once you have finished the frame, fiberglass, and epoxy of your catamaran boat, you will need to move onto the rigging.

This is a crucial step in the construction process, as it will keep your boat safe and secure on the water.

When rigging a catamaran, there are a few key components that must be taken into account.

First, you will need to determine the type of rigging you will be using.

Typically, catamarans use a combination of standing and running rigging.

Standing rigging consists of cables and lines that stay in a fixed position to provide stability and strength to the boat, while running rigging consists of lines that are used to adjust the sail and mainsheet.

Additionally, you will need to choose the right type of rope and hardware for your rigging setup.

The rope should be strong and durable, and the hardware should be made of stainless steel and be corrosion-resistant.

Once you have chosen the type of rigging and hardware, you can start assembling the rigging lines.

This process involves carefully measuring and cutting the lines to the proper lengths, and then attaching them to the mast and boom.

Depending on the type of rigging setup, you may also need to attach the lines to the hulls and deck.

It is important to inspect the rigging lines and hardware regularly to ensure that everything is secure and in proper working order.

Rigging a catamaran boat can seem like a daunting task, but it is essential for the safety and comfort of your vessel.

With the right tools, materials, and attention to detail, you can successfully and safely rig your catamaran boat.

Final Thoughts

Building a catamaran boat is a rewarding experience that requires patience and attention to detail.

With the right plan, materials, and steps, you can build your own boat in no time.

Now that you know the basics of how to build a catamaran boat, why not grab your tools and get started on your very own project? With the right motivation and dedication, you can make your dream of owning a catamaran boat a reality.

James Frami

At the age of 15, he and four other friends from his neighborhood constructed their first boat. He has been sailing for almost 30 years and has a wealth of knowledge that he wants to share with others.

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Wharram designs are based on years of practical, hands-on experience of building and ocean sailing catamarans. They are renowned for their seaworthiness, stability and safe simplicity. Designs from 14’ - 63’ are available for self-building in ply/epoxy with very detailed, easy to follow Plans often described as 'a course in boatbuilding'.

Study our Self Build Boats to familiarise yourself with our range of designs and their unique qualities. Download and read the Wharram Design Book which reviews each design in detail and offers a detailed introduction to the world of self-build catamarans. Order and download Study Plans and immerse yourself into the boat builder's mindset; evaluate the costs; the amount of time required to build your boat; where you will build it and where you will eventually launch it.

Once you have decided on the boat that is right for you, order your Boat Building Plans . All Wharram building plans are drawn for the first time builder, so anyone with a modicum of practical ability can build one of our designs. Our Building Plans present quality instruction, guidance and advice for both novice and professional alike. They are all based on decades of actual building experience and thousands of ocean miles sailed.

Go on adventures and live the life of your dreams. Spend your weekends coastal trekking and camping, or live aboard and spend your days sailing around the world. Become a member of the global family of Wharram builders and sailors. Wharram catamarans have been built and are sailing in all the World's oceans and can be found in far away ports and anchorages.

The quality of the Wharram self-build catamarans is reflected in their popularity, excellence of craftmanship and sound sailing qualities. More than 50 years on - with over 10,000 sets of plans sold and thousands turned into proud vessels - Wharram 'Cats' can be seen in harbours across the world, maintaining the highest reputation for surviving wind and wave.

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Index of Wharram self-build catamarans. Familiarise yourself with our range of designs and their unique qualities.

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How We Design

Several articles giving an in-depth look at our core design principles and how they are reflected as seaworthy, stable vessels sailing the oceans.

James and Hanneke receiving an award

James Wharram: Lifetime Achievement Award

A special award was presented to James Wharram for a 'Lifetime Achievement' as Pioneer catamaran builder - sailor and multihull designer.

James Wharram - British pioneer of the modern catamaran

About James Wharram

In the mid 50's, based on his research into ancient Polynesian boat design, James Wharram built the first off-shore Catamaran in Britain and sailed it out into the Atlantic. While the world's yachting community still did not accept such a design as a worthy sea-going vessel, James was landing his 23'6" 'Double Canoe' called TANGAROA in Trinidad in the West Indies.

There he built a second 40' Polynesian style Catamaran, RONGO, and in 1959 sailed it up to New York and back to the UK accompanied by two German women - being the first to sail a catamaran West-to-East across the North Atlantic. These amazing Trans-Atlantic crossings and the follow up book ' Two Girls, Two Catamarans ' have etched the name 'James Wharram' into the annals of yachting history.

Since then, James Wharram has been designing, building and sailing offshore catamarans longer than any other multihull designer. James was a 'hands-on' designer having, over his lifetime, built personally many of the prototype designs. These prototypes were built in the open, in barns, workshops and all the range of building sites available to self-builders, in a variety of climate types from northern European to the Tropics. James was often referred to as a 'Living Legend' or as written in 'Yachting Monthly' in January 2006: "James Wharram is considered by many to be the father of modern multihull cruising."

James’ last achievement was his autobiography published in 2020 as ' People of the Sea ', which he wrote in conjunction with his design/life partner Hanneke Boon. James died in December 2021 at the age of 93. The design business is carried on by his co-designer Hanneke Boon .

Tiki Odyssey

Two men in a boat cockpit

From Kos to Kefalonia. Father and son, in a self-build Wharram Tiki, survive a winter passage across Greece. The call came on Thursday. "Hey, Dad. There's a weather window, all next week. It could take us all the way to Monemvasia, maybe even round the Peleponese." Our plan was to sail our self-built Wharram Tiki 26 from its birthplace in Kos to its new home in Kefalonia, a winter passage of over 400nm east to west across Greece. A compelling read.

  • Read more about Tiki Odyssey

Hui Wharram Cornwall Gathering 2024

Wharram Hui 2024

We are having another Annual Hui! 3rd - 5th August 2024. This Hui will mark 70 years since James designed his first Catamaran 'Tangaroa' and we are excited that we will be mooring at Devoran Quay just a 5 minute walk from the Wharram Headquarters based in Cornwall. It would be lovely to celebrate his achievement with all of you.

  • Read more about Hui Wharram Cornwall Gathering 2024

Pacific Islander History Month

People wearing sarongs walking around a beached double canoe

This month of May in America is 'Pacific Islander History Month' and we at James Wharram Designs would like to join in and celebrate alongside them! As you may know, double canoes/catamarans are of ancient Polynesian origin. The modern day catamaran is a direct descendent of these original ocean-going vessels.

  • Read more about Pacific Islander History Month

James Wharram's Last Ride

Catamarans gathered at a quay

On 23 July, a motley fleet of self-built catamarans gathered off Cornwall to give James and Ruth Wharram their final escort. It was a fitting farewell to a legend. The ashes of James and Ruth Wharram were consigned to the sea to be carried by the ebb current out to the open ocean.

  • Read more about James Wharram's Last Ride

Hanneke's Atlantic Adventures (Part 3)

Double sailing canoe at sunset

My new home for the next two weeks was Ontong Java. She had crossed the Atlantic a week after us and was moored off the beach in Port Louis, on the North West coast of Grand Terre.

  • Read more about Hanneke's Atlantic Adventures (Part 3)

James' Eulogy

Matt Knight on Hecate

Hi everyone. I'm Matt. And apart from being truly honoured to be here to help send James on his way to his next adventure, I am here above all as a representative, really, for the many many people worldwide who's lives have been changed, for the better, as a result of James' life work.

  • Read more about James' Eulogy

A Living Legend Lives No More

James Wharram

We are very sad to announce that on the 14th December James Wharram left this earthly world, joining Ruth, Jutta and his many close friends that departed before him. At 93 years old his spirit has set out on the voyage to sail the oceans of heaven.

  • Read more about A Living Legend Lives No More

People Of The Sea - Compact Edition

People Of The Sea - James Wharram with Hanneke Boon

The new second edition of the autobiography of James Wharram and Hanneke Boon is now available! This more compact edition at the lower cost of £16 contains all the text and illustrations of the special first edition. An easier size to fit the bookshelf on your boat. A must for all Wharram enthusiasts and other sailors.

  • Read more about People Of The Sea - Compact Edition

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Catamaran Design Formulas

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

catamaran frame

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 frame

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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COMMENTS

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