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• Sailboat Guide

1998 Bosgraaf 15m offshore Trimaran

• Description

Seller's Description

Thunderbird: 15m Offshore Trimaran $400,000 Euros Year: 1998

Bosgraaf 15m Trimaran Builder: Winter & Woestenburg Architect: Peter Bosgraaf Yacht Design Flag: USA Location: Uruguay LOA: 14.95m Beam: 6 - 11.5m Draft: 0.8 - 2.3m Displacement: 7,000 - 10,000 kg Construction: Strongplank Epoxy Foam Carbon Alloy

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)

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• 1979 Walter Green 50ft Cruiser-racer Trimaran
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1979 Walter Green 50ft Cruiser-racer Trimaran 15m

Trinté sur mer, france, description, measurements, more details, description spanish, description german, description italian, description portuguese, description french, description catalan, description dutch, description swedish, description russian, description arabic.

• Engine Power: 28.0
• Number of engines: 1
• Tank capacity: 50
• ESP: 235000

Specifications

• Water displacement: 5.5

Total Power

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Video & Pictures: The new performance cruising trimaran, Tracer 1500TRi

• Katy Stickland

The new 1500TRi is the first vessel in the Tracer Series of performance cruising trimarans from Schionning Designs in Australia. See photos and video here!

Schionning Designs has unveiled its new performance cruising trimaran design – the Tracer 1500TRi.

At 15 metres and with a 10.2 metre beam, the trimaran aims to be competitive against the new era of large performance catamarans.

The 1500TRi has the distinctive Schionning aesthetic styling, as well as a practical and liveable interior.

Large spacious cockpit areas are located on either side of the cabin, with the helm stations positioned wide on the aft beam.

This gives excellent forward visibility, as well as clear sight of sails and telltales.

Lines run aft to the helms with winches and sail controls mounted close by for ease of operation.

See pictures of the new 1500TRi below

A 19 metre mast can be rotating carbon or a standard alloy option.

The trimaran has fixed rudders on the floats, although the designers at Schionning stress the 1500TRi will still be able to beach easily.

Kick-up rudders are an option if desired and depending on the intended use for the boat.

A single 30-40HP diesel is the recommended motor option.

Below deck. the interior offers luxurious and private cabins.

The master queen cabin is located aft, and can have an en suite.

The second master cabin is forward through the galley.

An unusual feature of the 1500TRi is the float area, which is usually minimal storage or sail lockers.

However, this design has created additional accommodation in the form of two single cabins.

At anchor, these are ideal for guests or crew.

The cockpit sole is half netting and half hard deck.

This gives a comfortable combination of keeping spray down but giving good drainage.

The trimaran will be available in a pre-cut composite kit with detailed CAD drawn plans, suitable for both amateur and professional construction.

Tracer 1500TRi

This is the first trimaran for the Australian based Schionning Designs

The trimaran will be available in a pre-cut composite kit, suitable for both amateur and professional construction

Bird’s eye view

The trimaran has a LOA of 15m, a BOA of 10.2m and a draft of 0.675,

The 1500TRi offers a relatively spacious living area

Extra accommodation

The float area has two extra cabins

Schionning aesthetic styling

The trimaran aims to be competitive against the new era of large performance catamarans

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The Complete List of Trimarans

There is no single trimaran that is best for everyone. Where some prefer luxury cruisers for long trips with family and friends, others might opt for a high performance racing tri for thrilling rides at breakneck speeds. With the recent spike in trimaran popularity, these days there is a perfect tri for every sailor. So to help prospective trimaran owners decide which boat is just right for them, we here at WindRider have put together a comprehensive list of the best trimarans on the market today! Read through for simple at-a-glance trimaran comparisons of boats both big and small, exhilarating and relaxing, and for all price points.

Jump to a specific sailing trimaran: Neel Weta Corsair WindRider Dragonfly Catri Astus Hobie Sea Pearl Farrier Sea Cart Multi 23 Triak SeaRail Warren Lightcraft Diam Radikal Challenger

Known for their award-winning luxury trimarans,   NEEL   is based in La Rochelle, the capital city of sailing in France. NEEL trimarans are built for fast cruising with an average cruising speed of about 10 knots, and are even configured to facilitate that sustained speed under motor propulsion. The NEEL 45 was notably named Cruising World’s Most Innovative Vessel in 2013, and by all accounts is an easy-to-sail, high performance boat that is just plain fun.

At a glance:

Models: NEEL 45, 65

Length: 45’ – 65’

Cost:   $$$$$

Use: Luxury cruiser

A fan favorite,   Weta trimarans   are fast, stable, and remarkably easy to rig. This single-sailor tri has a capacity of up to three, and the ease with which it can be transported and stored makes this a great, versatile boat for beginners. The Weta was named Sailing World’s 2010 Boat of the Year, and one ride is enough to know why: simply put, the Weta is an absolute ton of fun to sail regardless of skill level.

Models: Weta

Length: 14’5”

Cost:   $$ $$$

The high-end   Corsair trimaran   definitely holds its own in the categories of versatility, performance, and convenience. Boasting a rigging time of 30 minutes from trailer to sailor ,   the Corsair 42 – whose convenient folding amas makes trailering possible – is a simple option even for single sailors, though cabin space is suitable for two adults. These boats are wicked fast, capable of reaching speeds of 20+ knots, and were made for skilled sailors seeking solid construction and high performance vessels, not for beginners.

Models: Pulse 600, Sprint 750 MKII, Dash 750 MKII, Corsair 28, Cruze 970, Corsair 37, Corsair 42

Length: 19’8” – 37’

Cost:   $$$$ $

Use: Sports cruisers

Built for the sailor who wants to maximize the joys of sailing while minimizing any hassle, WindRider trimarans are notoriously fast, very safe, and a blast to sail from start to finish. With several models that can hold between 1 and 6 riders, including adaptive designs to allow participation from sailors of all levels of mobility, there’s something to suit every sailor’s needs. The WindRider 17, an exhilarating ride perfect for families or camper sailors, has been known to reach speeds of up to 20mph. This easy day sailor goes from trailer to sailing in under 30 minutes and is sure to fit in perfectly with whatever adventures you have planned.

Models: WR 16, 17, Tango, Rave V

Length: 10’11” – 18’3”

Cost:   $ $$$$

Use: Day sailor

The Danish-built   Dragonfly   trimarans come in a variety of models ranging from 25’ – 35’, all known for their spry performance, comfortable ride, and ease of use. Every model comes equipped with the unique “SwingWing” feature, a motorized system that can unfold the amas even while the boat is already underway – making it accessible to marinas and slips, and even makes trailering possible. Perfect for those who don’t want to sacrifice their comfort for high performance, the Dragonfly can breeze along at 13 knots while remaining one of the quietest compact cruisers out there.

Models: Dragonfly 25, 28, 32, 35, 1200

Length: 25’ – 39’

Designed for both safe cruising as well as for high speed racing,   Catri trimarans   will make your day. Especially noteworthy is the Catri 25, a stable yet wildly fast foiling trimaran with accommodations for up to 6 people. With profiles optimized for speeds of 25+ knots when foiling, this is no beginner’s sailboat. The special attention paid to stability in the foil design allows the Catri to be a single sailor vessel, even at foiling speed, with no special physical abilities. Whether you’re taking a small crew for longer rides at shuddering speeds or bringing the whole family along for a shorter, but still thrilling sail, the Catri is truly one of a kind.

Models: Catri 25

Length: 25’

Use: Cruiser/racer

A popular brand of trimaran in Europe,   Astus   has recently made its way to the US market to the delight of sailors on this side of the pond. Designed to offer maximum pleasure with minimum hassle, all models of Astus trimarans are fast to set up, quick on the water, inherently stable, and always a joy to sail. Their outriggers are mounted on telescopic tubes for easy stowage and towing, and can even be extended and retracted on the water for access to narrow passageways and monohull slips in marinas. With models in all sizes and price points, Astus trimarans are a great option for any sailor.

Models: Astus 16.5, 18.2, 20.2, 22, 24

Cabin: Some models

Length: 16’ – 24’

Use: Sport cruisers

HOBIE ADVENTURE ISLAND

Great for beginners and adventurers alike, the   Hobie Mirage Adventure Island   series is nothing if not just plain fun. With the option to use as a kayak or as a very basic trimaran, the Hobie is transportable, versatile, unintimidating, lightweight, and wonderfully affordable. The pedal system known as “Mirage Drive” allows a person to pedal the kayak using their legs for an extra kick of movement in slow winds. Amas tuck close to the main hull for docking or car-topping, adding serious ease and convenience to the exhilarating experience of the Hobie.

Models: Hobie Mirage Adventure Island, Mirage Tandem Island

Length: 16’7” – 18’6”

Use: Convertible kayak/trimarans

Best known for its use in camp cruising excursions, the   Sea Pearl   offers a roomy main hull and particular ability to sail in very shallow waters, making beaching and launching a breeze. The lightweight Sea Pearl trimaran is easy to tow, and the larger-than-expected cabin opens this vessel up for overnight adventures with plenty of storage space. The simple design makes the Sea Pearl notoriously low maintenance, and the ease it takes to rig and sail it add to the overall delight of owning this boat.

Models: Sea Pearl

Length: 21’

Use: Camper cruiser

Quick, lightweight, roomy, and trailerable,   Farrier trimarans   are made for versatility to fit every sailor’s needs. Different Farrier models are available in plan or kit boat form for those who appreciate building their boat themselves, but of course, also as the full production sail-away boat for the rest of us. Single-handed rigging and launching takes under 10 minutes from start to finish, minimizing hassle and getting you on the water fast. All non-racing Farrier designs use a minimum wind capsize speed of 30 knots or more to ensure safety for all those aboard. Add the roomy cabin and high speed capabilities to the equation and you’ve got a boat that is great fun for everyone.

Models:   F-22, 24, 25, 82, 27, 28, 31, 9A, 9AX, 9R, 32, 33, 33R, 33ST, 36, 39, 41, 44R

Length: 23’ – 39’4”

Cost:   $$$ $$

Use: Sport cruisers/racers

One of the biggest names in the game,   SeaCart   is internationally noted for its high performance trimarans that far exceed expectations for a production boat of its size. The SeaCart trimaran performs as brilliantly off the water as it does on with its super-light and efficient harbor folding system, making light work of trailering. Notoriously easy to manage and maintain, the SeaCart 26 One Design is the ultimate day racing trimaran, designed for both course and inshore/coastal distance racing. Absolutely worth the international buzz it has garnered, the SeaCart is a thrill from beginning to end.

Models:   SeaCart 26

Length: 26’

A high performance racer class, the   Multi 23   is a lightweight, powerful trimaran known for its wicked speed of up to 25 knots. Multi trimarans of both available configurations were designed to give beach cat thrills and speed without any of the stability or seaworthy concerns. Open ocean sailing is no issue for the Multi’s big bows, which do their job to keep her stable. Built for sailors with a need for speed, the Multi makes a perfect weekend boat for racers, especially those with a taste for boat camping.

Models:   Multi 23

Length: 23’

Another dual outrigger sailing kayak/canoe design,   the Triak trimaran   was designed to be effortless and fun, especially for beginners. Paddle the kayak with sails furled, use the foot pedals for an extra kick of momentum, or sail with just the mainsail – the only boat in its class to feature an asymmetrical spinnaker – for exhilarating speeds and a blast on the water. Car-top the Triak anywhere for a quick sail or plan for a week long expedition, but always count on having a great time on this easy little boat.

Models:   Triak

Length: 18’

Use: Convertible kayak/trimaran

SeaRail trimarans   are known for being affordable, light weight, trailerable trimarans that offer the perfect combination of exciting and relaxing experiences to a wide range of sailors. Whether it’s day sailing with your family, resort or camper sailing, SeaRail trimarans are ideal leisure vessels. Leave the hassle to the other boats – the SeaRail takes you from trailer to sailor in 15 minutes. But don’t let its reputation as a leisure tri fool you: if speed is what you want, rest assured that the SeaRail can deliver that as well.

Models:   SeaRail 19

WARREN LIGHTCRAFT

Warren Lightcraft trimarans , another example of a convertible kayak-to-sailboat option, are known for their aesthetically pleasing designs that are also, as the name implies, very light for simple transportation and ease of use. Convert the kayak into a fast, high performance sailboat in just minutes, fly around on the waves all day long, then simply car-top the 68lb Warren for a maximum enjoyment, low-hassle day on the water. Perfect for sailors and paddlers of all skill levels, the Warren Lightcraft is the best of both worlds and an absolute joy to sail.

Models:   Warren Lightcraft

Length: 15’6”

Built strictly with racing in mind,   the Diam 24   is a light, powerful one-design class trimaran and a notoriously exceptional performer. Boasting blistering speeds of up to 30 knots, Diam trimarans are not intended for beginners. For racers who crave the very best in terms of intense speeds, smooth handling and impeccable performance, the Diam is the red-hot one-design racing tri for you.

Models:   Diam 24

Length: 24’

For the sailor who prefers the finer things in life, the   Radikal 26   delivers. Perfect for bringing the whole family out for a day on the water, this high performance, trailerable sailing trimaran strikes the most luxurious balance between quicksilver speeds and a smooth, comfortable ride. The Radikal 26 trimaran is as convenient to transport and set up as it is pleasant to sail, with a folding system that minimizes rigging hassle and also makes this a trailerable tri. Built for a fast and comfortable sail rather than a hold-onto-your-seats thrill, one-the-water safety and overall pleasure makes the Radikal 26 what it is.

Models:   Radikal 26

Use: Sport cruiser

A solidly-built, single-handed trimaran, the Challenger also doubles as an adaptive design – meaning it is made to accommodate sailors of all levels of physical mobility. Best suited to lakes, the Challenger is a very safe, seaworthy boat for sailors of all ages and experience levels. Add to this the ease of owning, transporting and maintaining the Challenger trimaran and what you get is a simple, fun sailboat perfect both for beginners and those seeking a cheap thrill alike.

Models:   Challenger

At a glance comparison:

Did we miss one? Let us know. Tell us what you sail and what you like about each boat in the comments below.

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6 Best Trailerable Trimarans For Bluewater and Coastal Sailing

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Having a boat costs a lot of money, even when you are not using it, marina fees, etc. And once it is in the water most sailors never go very far from their “home marina” and sailing will be somewhat restricted. However, what if you could fold your trimaran and put it on a trailer, store it at your house, and go to a new sailing spot the next time?

Here are 6 of the best trailerable trimaran:

• The Dragonfly series
• Corsair Series
• Windrider 17

Choosing the best trailerable trimaran (a multi-hull with three “hulls”) will depend on crucial factors like speed, durability, design, and ease of transportation. This article is here to help you get started with your research and hopefully help you on the way towards your dream boat!

Table of Contents

Cruising Trimarans That Can Be Transported

Cruising boats are made for multiday sailing either on the coast of your favorite sailing area or full-out blue-water ocean crossings. Extended living should be a priority in these designs.

1. The Dragonfly 25 and 28 (Dragon Fly Series)

Dragonfly is in the business of making the “best foldable trimarans on the planet” many would agree with this statement. Dragonfly is known for its commitment to easy trailering and ease of use, shown in designs for the Dragonfly 25 and Dragonfly 28.

The “Swing Wing” system on the linchpins is one of the key features of the dragonfly series. The system’s application makes it possible for the trimaran to narrow its beam as much as 50%.

Attesting to its Scandinavian manufacturing, most parts of the trimaran are made in-house. This guarantees quality and ensures that all used parts are above standard.

You don’t need to look further than the Dragonfly 25. Its centerboard slightly offset to port. Extra space is created in the main hull’s interior with a trunk buried under a settee. Performance-wise, the low drag and narrow hull shape allow the boat to reach blistering speeds.

Dragonfly 28 In Numbers

• Length: 8.75m
• Beam folded: 2.54m
• Max crew: 5-7 people
• Max Speed: 22+knots

Dragonfly 25 In Numbers

• Length: 7.65m
• Beam folded: 2.30m
• Max crew: 4-6 people
• Max Speed: 21+knots

2. Farrier F-22

New Zealand enters the trimaran manufacturing race with this premium sea goer. The vessel comes in two different versions: a performance variation with more horsepower and a full cabin cruising version. 

Compared to the dragon series the F-22 has the biggest allowance for space.

The F-22 is known for being one of the easiest trimarans to fold and load.

The sports version of the F-22 has some really good performance to offer. It has an aggressive spirit: you can mount a sail while leaving plenty of space for the boat’s fine entry and flared forward sections. The build quality is also topnotch—a lasting memorial to a principle that Ian Farrier always worked by: excellence.

Farrier F-22 In Numbers

• Length: 7.0m
• Beam folded: 2.5m
• Max crew: 3-5 people
• Max Speed: 20+knots

3. Corsair Series

This boat series has an exciting history. Farrier created it to promote his trailerable tri concept. However, the series is now independent with a top-class vehicle to its name.

The Corsair 760 is listed as providing some of the best performance and safety benefits to sailors.

Building off the spirit of excellence of the founder, the Corsair 760 has created a boat with comfort and racing potential. The boat can be tricky to handle at first, but it will be a breeze once you get the hang of it.

It is also worth noting that the corsair 37 is the largest trailerable trimaran on the market today.

Daysail Trimarans That Can Be Transported

Boats that are made for dayssailing are usually smaller, cheaper and more easily handled. They are perfect for those looking to enjoy a full day on the water in calm weather, but are usually less suitable for multiday events or rough sea sailing.

4. The Astus Models (20ft, 22.5ft, and 24ft)

If you’re looking for something small but still capable of doing day sailing, this 22.5-foot trimaran is for you. Built for speed and maneuverability, the Astus 22.5 has optional foils to optimize speed.

The modern design, coupled with the spacious interior, can fit up to four beds. Accordingly, this trimaran is suited for family outings. 

The Astus brand specializes in transportable trimarans, worth noting is that some models need a specific trailer whilst the smaller boats use a standard trailer.

5. Weta 14.5

The 2019 Weta trimaran is a 14.5-foot (4.4-meter) trimaran featuring a carbon frame, centerboard, rudder foil, and rudder shock. The hull is made from fiberglass and foam. The Weta is built for strength and speed based on these lightweight materials. 

The 2019 Weta trimaran is easy to sail and is worth considering whether you want to take a quiet sail, race with your friends, or take kids to a sailing lesson. It has a simple design and is easy to set up independently.

The small size makes it more suitable for daysailing in good weather rather than multiday cruising, although more experienced sailors will of course push the limits of this boat.

6. WindRider 17

The 17.4-foot (5.3-meter) WindRider 17 is one of the more versatile trimarans in the market. It packs high performance for a low cost. This trimaran has a light rotating mast to boost performance, and a full-battened mainsail optimizes visibility. 

This sailboat is made from rotomolded polyethylene, which is more durable than fiberglass and demands less maintenance.

The WindRider 17 has a comfortable interior and can fit six adults. This is an ideal choice for social sailing for a couple or a family and friends. It’s easy to ride, and a shallow draft allows easy maneuverability. 

What’s the Largest Trailerable Trimaran?

The largest trailerable trimaran is the Corsair 37 , this multihull is built for single-handed cruising while still maintaining the ability to comfortably seat 6 people.

The Corsair 37 provides comfort, speed, and safety. It also contains just enough space to accommodate amenities like a propane stove, a sink, and other equipment.

The vessel is designed to be a performance cruiser. It features an aluminum rotating wing mast, carbon fiber bowsprit, and premium deck hardware. The corsair can still cut through the water with ease despite its size, putting the wind in your sails.

What Is a Catamaran?

A catamaran is a boat with two hulls (a trimaran has three) connected by a bridge deck. Catamarans usually offer more space than both monohulls and trimarans of the same length. The catamaran is usually somewhat slower than a trimaran but faster than a monohull. They are usually made of fiberglass or carbon fiber.

Catamarans come in all shapes and sizes. You can find straightforward sailing catamarans, perfect for those who are only starting their sailing journey. Larger sailing catamarans have become extremely popular for long-distance sailing.

There are also power catamarans, they have huge diesel-powered engines (sometimes electric) and no sails. Also called “power cats”, these boats can reach 30+kts.

Can a Trimaran Be Trailerable?

As discussed above, some trimarans are possible to put on a trailer and move to another sailing area or to be stored at home. This is usually not possible with catamarans but is sometimes possible with the trimarans that are fitted with foldable amas (the two outer “floats” or “hulls”).

Some trimarans can be trailerable, this is mainly due to the ability to drastically decrease the vessels beam, sometimes as much as 50%. This allows the trailer plus trimaran to be below the legal requirements of the road.

Final Thoughts

It has proven difficult to beat the trimaran in terms of speed. Through the ages, this type of vessel has proven to be immensely enjoyable in all kinds of sailing activities. These can range from sea adventures to waterborne relaxation in your free time.

Trimarans come in various types, foldable, for cruising or racing, etc. However, there is a common factor: many of the small ones are trailerable. This makes them easier to move than most other types of boats.

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

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• PERFORMANCE TOPICS
• How much do multihulls weigh

Weight and displacement

C ause for confusion

Building hours for multihulls

Building hours can vary considerably from one yard to another, but also from one boat to another in the same yard, even when the designs are very similar. 

Building hours are difficult to nail down but we provide some pointers in this article.

How much do multihulls weigh? We provide some real world data and show how to put it to good use.

MULTIHULL WEIGHT AND LENGTH COMPARED

We'd all like our next set of wheels to be a cool sports car with room to pick up the kids from school, do a bit of shopping, and maybe make the occasional trip to the hardware store. But we understand we're going to have to compromise somewhere. Same with boats. First across the line will probably not be the most comfortable cruising boat unless it's big and/or expensive. 

But how do you decide how fast you can go without sacrificing too much room, or without having to go bigger and more expensive? The purpose of the information in these plots of boat weight against length is to give an indication of what's achievable in the real world for fairly conventional construction methods and materials, and a relatively modest budget.

A lot of the boats on the plot are well known world wide including the Seacart 30, Corsair 36, the Multi 50 Arkema, G32 Foiling cat, the Gunboat G4, an ORMA 60 and a typical Gunboat 60 (weight estimated) which is off the page in the top right hand corner of the first plot.

Comparison Data

In the interest of finding a standard measure by which to compare a wide range of multihulls we’re going to use the measured weight (WM) component of the OMR Rule because it provides us with a wealth of readily accessible and reliable data.

We have also included some weights of boats that have been measured for other rating rules using similar standard, or where we believe the weight figure provided is reliable.

WM is defined in clause 6 of the OMR Preamble as follows:

Weight of the vessel shall be measured with all fixed equipment and accessories which will be carried during racing as documented in the inventory but without crew, crew personal kit, or consumables, including water and fuel. The vessel must be dry and all bilges and lockers open for inspection.

The full text of the OMR Preamble can be found here.

The chart plots in this article are built on our data base which currently comprises 109 catamarans and trimarans, 97 of which we have official OMR weights to work with.

The big picture 22' - 60'

This is the big picture graph that plots the weight against length trend line for catamarans and trimarans up to 60' LOA and also includes a MOD70 which is off the scale to the right. The blue line is the trend line for catamarans which are represented by blue squares. The grey line is the trimarans. Some images to follow will zoom in on various parts of the graph so you can read boat names.

It's interesting that the plot lines cross over at about the 40' mark with cats becoming relatively heavier as size increases. We shouldn't try to read too much into this in terms of the weight of the bare structure. It's a natural consequence of cats being preferred for long term cruising in the larger size range while trimarans are the weapon of choice for ocean racing. They employ exotic materials, refined engineering and meticulous manufacture to achieve low weight. 

ZOOM BOX 1 - 35' TO 54' LOA

The plot above focuses in on the 35' to 45' size range. The three trimarans Arkema, Carbon3 and 3 Itch are all sitting well below the trend line. Three Itch is the only one of these three for which which we have an OMR weight. Jessica Rabbit is sitting above the line but we used a weight figure provided by Martin Fischer which is an estimate of sailing weight including crew and equipment. Jessica Rabbit would sit closer to the black line under an OMR measurement.

Arkema's number is the quoted "displacement". If that is the actual weight it's a very light boat for its size but if we were to draw a trend line for Gunboat G4, Arkema, the ORMA 60 and MOD 70 all of these four boats would be close to that line. They are also all quite high tech construction.

ZOOM BOX 2 - 35' TO 45' LOA

The six Stealth catamarans (shown by the red squares) which are built by Asia Catamarans in Thailand provide an excellent benchmark for a high performance lightweight cruising catamaran that doesn't use exotic materials or construction methods. Most of the these boats have carbon rigs and synthetic rigging and they employ carbon in high load areas but are otherwise relatively conventional in construction using foam core with epoxy/glass skins. The three Corsair 36 trimarans are firmly above the line even though two of them were built in carbon.

ZOOM BOX 3 - 22' TO 33'' LOA

This plot in the 22' to 34' size range is mostly made up of trailerables. Trimarans on the black trend line and grey triangles, cats in blue squares. We didn't have enough cats under 30' in the data base to reliably carry the catamaran trend line into this plot.

GETTING BELOW THE LINE

Leaving aside the fitout and inventory that goes on the boat (we discuss that in another article) there are three critical elements to a light boat; engineering, materials and build methodology.

Engineering is critical for understanding the loads on the structure, having a good knowledge of the materials properties and applying the materials accordingly. Connecting loads with material properties means that a close working relationship between the builder, the designer the materials people and the composites engineers is absolutely fundamental. Where this relationship doesn't exist the materials specification has to be more conservative. That's one good reason why light boats take more time, more expertise and more effort, and consequently are more expensive.

Material selection is critical for making sure things are as strong and as stiff as they need to be. Carbon won't make for lighter hulls but it will reduce the weight and provide added stiffness in load critical structures like beams, rigs and foils. PVC foam is the ideal core unless you go to honeycomb cores - but that puts you in a whole new price bracket and ups the build skills requirements.

Build Methodology involves good laminating practice; getting the right fibre ratios and resin cure times and achieving good secondary bonding. If the engineer or designer is not sure of the level of skill on the shop floor then once again the specification needs to be conservative.

All of the boats that we see below the line on these plots have been built with due attention to these elements and the further they are below the line the more they will have focused on these elements in the respective design and build stages. 

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• Last update: 2nd April 2020

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Open source 12-15m high performance/semi-cruising catamaran design

Discussion in ' Multihulls ' started by groper , May 10, 2017 .

groper Senior Member

Hi all, So ive basically decided to see where this goes... ive come up with a rough design idea for a performance cruising catamaran design which is definately biased a little more to the performance end of the spectrum rather than the heavier cruising style of boat. The idea of making the design open source is to allow many contributers to the idea and see where it can end up. Many minds contributers should result in a far superior design thats well thought out before anyone attempts a build of the design. Im not sure how the file sharing system will work as we all need to use a compatible software model so that we can make changes and share them and over time and continue to build a comprehensive design. Once the design has been hashed out, anyone may download the full design and start building it via CNC plans, 3D printing or by whatever other means you so desire. First of all, im looking for expressions of interest from those amateur or professional designs who wish to contribute and your ideas on how we can make this work. Please post here if you have an interest in performance cruising sailing cats and have the ability to contribute to the design in any way, large or small. Im sure we we all have our forte`s, let us know who and what so we can get started. Ill post a few images of what i have so far - and we can go from there. Just need to finish some work and ill be back to get things moving...  

So basically this is where ive taken things so far and gives a feel for where i want to take this. One thing that is new - well at least i cant find evidnce of people doing it before, is the combined use of vertical dagger boards and curved daggerboards which are offset from one another in a fore/aft manner. The general idea is that the forward curved foils provide lift in fast reaching and running conditions to reduce WSA and located in the forward biased position will lift the bows more than the sterns to keep the trim flatter rather than bow down and burying when powered up and running downwind. The curved foils are not designed contribute to leeway resistance as they are almost horizontal. This is an arrangement used on the fast trimarans of this era and the curved foils should also be housed in a box which allows for fore/aft rake control to control the Angle of attack. These boards can reduce the lift via retraction and also angle of attack control. The second pair of dagger boards located aft of the curved foils are strictly for leeway. They are canted inwards so they are more vertical once the boat is heeled. These boards are basically like the centerboard of the same above mentioned trimarans - something the modern tris cant do. There is also the other added benefit of both boards on this cat can be assymetric for increased lift/area compared to symetrical - again the tris only have a single symetrical center board. Of course there are drawbacks- 4 boards instead of 2 or 3 for a tri. Thats added weight and cost. Thus i doubt this arrangement would benefit smaller catamarans but be better suited to larger cats where the added weight is not a problem to carry in the grand scheme. Also this is not intended to be a fully flying foiler like an around the buoys racer but rather as an ocean going boat. The benfit of the pitch damping of the forward foils is a proven concept and the improvements to safety and comfort are notable in all modern passenger ferrys and other ships using foil stabilization for seakeeping benefits. In this arrangement, all boards inc rudders are retractable so there is benefits to marine fouling and shoal water navigation ability. There is also the ability to retract the lifting foils and eliminate the drag in light conditions where there is insufficient speed to create a lift advantage by using them. Ive played with various accomodation layouts already - ive simply left the cabin design off in these renders to create more of a blank page idea in peoples minds A few drawings to show the concept so far;  

Gwion Junior Member

Looks like a fun project. May I preface this with I know nothing. The forward lifting foil looks interesting. Does it have be be in the hull? The further forward you move it the greater the lever arm so the smaller (lighter) the foil required. What about reducing two down to one. Mounting it under the forestay / fore beam with the ability to rotate it aft up under the tramp when not required. With no case to worry about you could use a T foil like the moths with a wand controlled trailing edge flap all in the one structure and self contained. With the ability to cant the structure to the leeward side it would then provide more vertical lift when heeled. So two curved foils and cases and adjusters all down to one pretty much self contained easier to build unit that won't compromise the hull if hit. The structure could be designed so that any flex, as it loads up, results in more lift . The opposite happening could be interesting. Please don't hesitate to tell me to go away if this is silly.  

The thing is - and others have suggested it also -with using 1 foil per hull is you cant optimize the longitudinal position of the vertical component and the horizontal component. I think we dont want the foil too far forward or it you dont get as much of the hull to lift before it pitches up too far. This positioning is extremely important. With it done right - you get a reduction in WSA as the hull is partially supported by the foil with a slight bias toward lifting the bow as it does so. The calculations involved with getting this part right are over my head at this point - hence starting the thread It must be balanced with the driving force of the sails. If attempting to use a single foil for vertical and lateral lift the position of the foil is restricted to the center of effort of the sailplan so that the boat is balanced and doesnt laterally load up the rudders. The big racing trimarans already have this figured out - if you look at them you will see that the ama foils are further forward and the central hull dagger board is raked quite heavily aft to get the correct position for the lateral component. All im doing here is putting both components in a single hull as opposed the trimaran using the central hull and the ama for each purpose. But theres alot more to the design than just the foils - so please lets not get all hung up on just the foil part of the design. Its just an idea and rather than keep it to myself i thought id share it...  

UpOnStands Senior Member

groper said: ↑ you get a reduction in WSA as the hull is partially supported by the foil ... Click to expand...

jorgepease Senior Member

I also know nothing but since it's performance oriented why not use water ballast to keep trim, that's been done. When I look at it, it seems like the short foil will have problems in waves, seems like you are going to stick, rise, stick rise and end up going slower.  

Why would that be the case when the racing trimarans have already proven the concept? Think of like this. Take a mod 70 tri or new multi 50 tri or similar. Remove the center hull and put the dagger board into the port hull. Copy the dagger board and put another 1 into the stb hull. Remember that the lee hull is heavily pressed into the water in reaching/broad reaching conditions. videos of the tris rarely show it ventilates... Water ballast...its not as efficient, why carry around extra weight? If ballast was advantageous, theyd be doing already on the racing multihulls. Its more efficient ro lift the front end rather than weight down the stern...  

Ad Hoc Naval Architect

groper said: ↑ The idea of making the design open source is to allow many contributers to the idea and see where it can end up. Many minds contributers should result in a far superior design thats well thought out before anyone attempts a build of the design. ... Click to expand...

The new Hydroptere website: Home :: L'HYDROPTÈRE - Alain Thébault http://www.hydroptere.com/ --------- Points of note: --Hydroptere IS the fastest sailboat on the planet-currently holding the record of 51.17 knots over a nautical mile. --Hydroptere is the largest sailboat ever to go over 50 knots. --Hydroptere carried at least 10 crew setting her records-more than any other speed record setting craft. --Hydroptere is the only sailboat to have gone over 50 knots with an onboard head. --Hydroptere is the only speed record setting sailboat to go over 50 knots without a wing rig. --Hydroptere is the only speed record setting sailboat to use a movable water ballast system. --Hydroptere is the only speed record setting sailboat to have an auxiliary engine(like many other ocean racers).  

Ad Hoc said: ↑ too many chefs in the kitchen.. Click to expand...

True. specs first. I can't contribute in knowledge but I can help if needed in drawing the concept, nice thing about these softwares is it's so easy to collaborate.  

Is "26 knots in comfort" even possible? I've done 30+ knots in a speed boat but it was not "comfortable". 14m at 20 knots? Maybe active hull control is needed.  

Every speed boat I was in was planing and would require a kidney transplant at high speeds but the big go fast boats don't seem to care, they pass us doing 45-50 while sprawled out on bean bags but it still turns their insides to jelly and they have a hard time walking next day. I know a few of these guys, cracks me up. I suppose a catamaran is supposed to cut through waves so up to a certain point can see it being ok and then after that point it's rodeo time! lol  

Ive watched alot of ocean racing videos over the years and i follow all the major sailing teams and their acheivements. 1 thing that really stands out to me is the impact of the patial foil support systems on the boats ability to maintain speed safely in a seaway. The modern tris are achieving incredible ocean crossing speeds now- like the last trans indian ocean record of circa 5500nm in 4 days by idec sport. These boats are not full foilers. Noone has yet proven that full foiling is feasable or advantageous in ocean racing - it may happen one day but not yet. But the point ia partial foil supported boats using the curved foils located in a forward position - idec sport curved foil is almost as far forward as the jib tack on the deck! Its very apparent to me this type of foil provides many advantages and i dont just mean speed. The pitch and heave damping these foils provide is very significant. I even thought about fitting them on my power cat for this reason alone. The improved seakeeping is well documented not just in sailing but also commercial power boat designs and high speed ferries etc They also balance the pitch forward when driven hard and that avoids the bows burying like you saw in the video above of the schionning cat. This means a drier and also safer sailing experience. So back to the requirements... The requirements are; simple to build ie all developable surfaces, Lightweight foam sandwich construction so that smart infusion construction can be used and deliberately designed to reduce the complexity and cost of the build ie keep costs to a minimum, Enough interior volume to provide a reasonable level of comfort and amenity for 1 couple on extended cruises in tropical climate waters and perhaps room for the odd hitchhiker etc, An emphasis on sailing performance to provide exhilarating and competitive experiences in regattas but also so the boat always sails rather than motors even in lightwinds and when the wind is hard on the nose, The ability to cover +300miles per day in favourable conditions, Shoal draft with retractable appendages for beaching and exploring shallow inlets etc.  

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