foiling trimaran plans

Foiling 101

The F101 takes you through your foiling journey, providing a progression pathway from the beginner foiler to the Olympian. F101 sets new challenges and goals at whatever level you come in, from expert to beginner.

The F101 is an all-new foiling trimaran aimed specifically at those sailors that, for whatever reason, thought foiling was too difficult for them. The concept originates from the experience of teaching many people to foil in the International Moth class and addressing the main barriers they faced. So we set about creating a new boat without the design restrictions of a box rule – in this way, foiling has been made easier.

“The boats are great fun and I was foiling after about 10 minutes on the first day and having extended periods of foiling after day 2. Not having sailed dinghies for the better part of 20 years, I never really expected to foil, so the boats are fulfilling their designed purpose beautifully. ” — Pete Selby

As an F101 owner, you get access to all of this knowledge and experience, plus access to the F101 Tribe.

The F101 Tribe is an exclusive social media channel that only owners can access, share experiences, tips, and events and generally have a fun time with foiling at the heart of the journey. It is like having a 24/7 help desk..someone, somewhere in the World, is normally awake to help!

The ethos of Foiling World and the F101 TRIBE is to:

· Sail a Fun boat

· Sail with great friends

· Sail in great locations

The F101…more than just a boat! We guarantee to get you foiling, wherever you are in the world, as remote as you like. If you buy an F101, you will FOIL! GUARANTEED!

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Want to build a small foiling trimaran

Discussion in ' Multihulls ' started by neptunkryssare , Aug 3, 2014 .

neptunkryssare Peter

Just not to be missunderstood. I am asking for two things, First, I would like to find plans for real boats that is close either of the boats which are in the videos. Preferable around 560 or so. It does not need to be class-legal . Material - plywood and/or foam. Second - if that is not possible, I would like to find plans for similar rc-boats that I can build and gaign some experience from. Only modification I would like to do for NF3 If I could, Just slightly larger amas as failback. And no, I am for some reason not very found of windrider. Maybe thats because I want to build the boat myself. Because there are no plans for that trimaran, I am trying to find a way to accomplish my wishes in some other way. To my sadness I have not fond anything near that is possible for me to buid more than as a rc-boat, so I figure I should start there and build a rc-boat first to gain some experience. I have found 2 videos of quite similar rc-boats that best suit my wishes. If I find plans for such a rc-bot I would like to play around with some modifications. Preferable modifications I would like to do is 1.AXE-Bow 2."Flexing" amas. 3. and I guess most important - selfadjusting foils. But I can not find planes for building them. Do anyone know to find plans for similar rc-boats to start from.? OR maybe even better- full scale plans for boats of that kind.? If I can get full-scale plans, then I think that I maybe I first build a modell of the fulls-scale plans before I make the real thing.  

Doug Lord Flight Ready

Small Foiling Trimaran Peter, you might try posting on the German Mini 40* forum, link below. I received a nice note from the guy in your second(RC Hydrofoil Sailing...) video, Christophe Hubscher. (his note is under comments here: https://www.youtube.com/watch?v=LmXCdAlo4mk ) I'm sure he would help you and his boat is excellent! I have his e-mail--e-mail me and I'll give it to you. My e-mail is in my profile-click on my name. http://www.rc-network.de/forum/forumdisplay.php/166-Mini-40 Also you can send a PM( if you've reached the 5 post threshold) to "PerthMini40man" who posted in the MPX thread here: post 1238 http://www.boatdesign.net/forums/mu...lf-righting-trimaran-test-model-36058-83.html His "real" name is Ian Holt and he has designed some excellent surface piercing foilers. It appears that he stays within the Mini 40 Rules which prohibit an oversquare platform. Any surface piercing foiler will benefit greatly from an oversquare platform. Check posts 934 and 1175 as well. Also you could join and post here: http://www.rcgroups.com/sailboats-59/ There are a few multihull guys that post once in a while-one-Dick Lemke-may be able to help with plans. *Mini 40- length 48" Beam 48"-and sail area is limited-forgot the number. ==================== A surface piercing foiler will be simpler to build, but there is another type of foiler that could interest you and that uses fully submerged foils with wand altitude control. I designed and built a number of F3 foilers around 14 years ago. The great advantage of this type foiler is that it develops 100% of its righting moment using the foils. You might consider this for your second foiler. I can help with the technical stuff.  

Attached Files:

F3 foiler 4.jpg, f3 foiler reef points.jpg, f3 foiler 4 - copy.jpg, f3 foiler 2.jpg.

foilers Here are some full size cats using fully submerged and surface piercing foils-just for reference to foil systems: ================== Heres a video of a brand new 18' cat using a version of the same basic system Dr. Sam Bradfield used on his tris: dual independent wands controlling T-foils on each side. https://www.youtube.com/watch?v=T6bXg0LI5EQ#t=16 And here are some stills and a link to the Whites Dragon-an 18' foiler using surface piercing foils( http://www.boatdesign.net/forums/multihulls/whites-dragons-mini-hydroptere-esq-35062.html ). And don't forget to check out the 18' Flying Phantom and Nacra F20FCS foiler threads here-both use UptiP foils(pioneered in AC 34 by TNZ) as well as the much larger GC32 thread here-just to learn about foil types:  

Whites Dragons on foils.jpg

White dragon 2.jpg, whites dragon 2 6-25-11.jpg.

Skyak Senior Member

neptunkryssare said: ↑ Just not to be missunderstood. I am asking for two things, First, I would like to find plans for real boats that is close either of the boats which are in the videos. Preferable around 560 or so. It does not need to be class-legal . Material - plywood and/or foam. Second - if that is not possible, I would like to find plans for similar rc-boats that I can build and gaign some experience from. Only modification I would like to do for NF3 If I could, Just slightly larger amas as failback. And no, I am for some reason not very found of windrider. Maybe thats because I want to build the boat myself. Because there are no plans for that trimaran, I am trying to find a way to accomplish my wishes in some other way. To my sadness I have not fond anything near that is possible for me to buid more than as a rc-boat, so I figure I should start there and build a rc-boat first to gain some experience. I have found 2 videos of quite similar rc-boats that best suit my wishes. If I find plans for such a rc-bot I would like to play around with some modifications. Preferable modifications I would like to do is 1.AXE-Bow 2."Flexing" amas. 3. and I guess most important - selfadjusting foils. But I can not find planes for building them. Do anyone know to find plans for similar rc-boats to start from.? OR maybe even better- full scale plans for boats of that kind.? If I can get full-scale plans, then I think that I maybe I first build a modell of the fulls-scale plans before I make the real thing. Click to expand...

Foilers Peter,talking with Christophe would be your best bet on getting plans for an RC foiler. Ian Holt might also be able to help for a Mini 40 version. Your idea of building a model to learn about this stuff is a good idea and has been done by some of the best in the business.  

Doug Lord said: ↑ Peter, you might try posting on the German Mini 40* forum, link below. I received a nice note from the guy in your second(RC Hydrofoil Sailing...) video, Christophe Hubscher. (his note is under comments here: https://www.youtube.com/watch?v=LmXCdAlo4mk ) I'm sure he would help you and his boat is excellent! I have his e-mail--e-mail me and I'll give it to you. My e-mail is in my profile-click on my name. http://www.rc-network.de/forum/forum...hp/166-Mini-40 Click to expand...

foilers Initially, you said you wanted a trimaran-have you changed your mind. A trimaran does better with an oversquare beam which gives you more power at little cost in weight. The only reason Mini 40's are square is because of a crazy rule.....  

Doug Lord said: ↑ Initially, you said you wanted a trimaran-have you changed your mind. A trimaran does better with an oversquare beam which gives you more power at little cost in weight. The only reason Mini 40's are square is because of a crazy rule..... Click to expand...

And yes, thats one of the reasons why I search for other planes than the mini 40s that I downloaded.  

idkfa Senior Member

https://www.youtube.com/watch?v=zXSgZCDVWOM  

idkfa said: ↑ https://www.youtube.com/watch?v=zXSgZCDVWOM Click to expand...

Foilers Peter, as you get more into this you'll be able to distinguish foil types better: the model in your video uses surface piercing foils(automatic altitude control with speed)-you can tell because of the angle. The rudder T-foil is a trailing foil that "follows" the main foils. The rigs are similar in principle to the Hobie Trifoiler, but the Trifoiler uses fully submerged foils controlled by forward facing "feelers" that move the foils to control altitude. Hope it works out with Christophe!  

R.Finn Junior Member

So all this hoopla with Doug's Fire Arrow, and there's already a very lovely, simple and wandless design out there, making it look easy. Thanks for linking those videos. They're refreshing to see.  

R.Finn said: ↑ So all this hoopla with Doug's Fire Arrow, and there's already a very lovely, simple and wandless design out there, making it look easy. Thanks for linking those videos. They're refreshing to see. Click to expand...

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Foilers R.Finn said: ↑ So all this hoopla with Doug's Fire Arrow, and there's already a very lovely, simple and wandless design out there, making it look easy. Thanks for linking those videos. They're refreshing to see. Click to expand...

Unstayed mast build for small canoe based trimaran.

To build a small beach cat

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Parallel 45 Marine

Dinghies and One Design

F101 Foiling Trimaran

F101 takes you through your foiling journey, providing a progression pathway from the beginner foiler to the Olympian. F101 sets new challenges and goals at whatever level you come in; from expert to beginner.

The F101 is an all new foiling trimaran, aimed specifically at those sailors that, for whatever reason, thought foiling was too difficult for them. The concept originates from the experience of teaching many people to foil in the international Moth class, and addressing the main barriers they faced. So we set about creating a new boat without the design restrictions of a box rule – in this way foiling has been made easier.

Why three hulls?

Many Moths use buoyancy in the wings to help sailors get to grips with the boat, but this buoyancy is limited to helping the helm recover the boat from a capsize and does little to prevent the capsize in the first place. The F101 Tri-configuration allows for a slender hull with enough length to prevent pitch poling, while at the same time creating a stable platform to allow novices to get out on the water with no previous foiling experience.

The super slender wave-piercing outer hulls are set at an optimum angle to initiate foiling – simply sit on the windward hull, which will cant the boat to windward, then sheet in and take off! If the F101 does pitch forward, the main hull is designed to recover straight back onto the foils; the hull’s additional length keeps the angle of incidence shallow. Its rocker is matched to the angle of incidence – and the additional buoyancy forwards help lift the bow. The benefit applies to the outer hulls too – if the F101 falls in to windward, the windward hull lifts the boat back out. If the boat falls in to leeward there is enough buoyancy to prevent a capsize and the boat is quickly back on the foils.

Parallel 45 Marine is proud to be the exclusive North American importer and distributor of the F101.

Design Features

• All carbon construction: main hull, foils, floats, beams, 2 piece mast.
• Very simple, well thought out control systems.
• While being designed to be a single handed boat, you are able to take a friend out for a fun sail, hence the 1+1.
• The boat is stable in non-foiling mode so that if the wind drops it is easy to sail home.
• Long, central hull places the rudder and main foil further apart, removing some of the limitations and bad habits that other foiling boats suffer from.  The hull is long enough to prevent nose diving.
• The foils retract so that the boat can be launched from a launching dolly in shallow water.
• The mainsail can be hoisted by halyard and, crucially, the sail easily drops when coming on to a lee shore.
• Option of a furling downwind sail, to give extra power and an added excitement if needed in lighter airs.
• Learning to foil in most monohulls can be very tiring, due to repeated capsizes. The F101 design is very hard to capsize!

The Tech Specs

All up weight: 75 kg. Length 5.4m. Beam 2.55m. Sail area: 9.0m2 main + 5.5m2 gennaker. Target crew weight range: 60-150 kg. Take off wind speed: 7 kts. Boat speed range: 10-25 kts.

Please visit Foiling World at www.foiling101.com for more information.

F101 All-inclusive, Ready to Sail package includes: 

Epoxy Carbon hull platform 

Carbon beams

Trampolines

Carbon fibre 2-piece mast with all standing and running rigging

Aluminium boom and gnav assembly

Hyde Sails Mainsail and Code Zero including Sail bags

2-piece Epoxy Carbon Main foil 

2-piece Epoxy Carbon T foil rudder 

Adjustable Custom cast rudder stock with Carbon tiller and extension

Harken deck gear package including all blocks and running rigging

Alloy launching trolley

Polycotton top cover

Main and rudder foil cover set

New for 2020!   

• Includes all items listed above
• Self-Tacking jib option (ST), with base fittings now fitted to all new boats
• F101 with Code Zero.
• F101 with Self Tacking Blade Jib
• F101 with Code Zero and Self Tacking Blade Jib
• Carbon detailing on all transoms and on the main hull to accent carbon construction.
• New custom wound carbon mast and square section alloy boom from Selden – A stiffer, more powerful rig which delivers improved upwind performance and greater adaptability for varying crew weights and wind strengths. With a straighter, stiffer rig we now use a one to one halyard and a toggle halyard attachment which no longer needs a fiddly shackle! The square section boom allows a neater, standard, Selden gnav slider.
• The 2020 mainsail now comes in Grey detail and is cut with less luff curve to suit the stiffer mast. New clew slider fits neatly into the boom track and discards the need of a clew loop.
• New jib sheeting system to allow code zero or Blade jibs to be sheeted on the cleats on the main hull. 2:1 for the Blade and one to one cross sheeting for the Code Zero.
• New simpler attachment to beams for jib sheeting and shrouds via soft shackles.
• The front beam to mast compression struts have been removed leaving a clean look and less rigging!
• Finishing on the centreline, is now invisible on the decks of the main hull and floats

2021 F101 All-inclusive, Ready to Sail packages:

*Prices are in the currency of each country. Due to COVID all boat prices are EX/Works Brightlingsea, UK. Shipping surcharges will be calculated at the time of shipping. Please contact us us to order your boat!

Parallel 45 Marine is focused on distributing and retailing boats, clothing, sailing gear and accessories for the dinghy and one design sailor.

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Professional BoatBuilder Magazine

Folding multihulls.

By John Marples , Jan 28, 2023

Folding multihulls and their beam-reduction strategies.

A Farrier 33R trimaran with amas folded and secured on a road-legal trailer exem- plifies the advantages of adjustable- beam multihulls, which are easy to trans- port and store out of the water.

“I’ll be surprised if you can find space in the harbor for that thing,” I heard him say as my new 37 ‘ (11.3m) trimaran was about to be launched. I hadn’t given it much thought, but now this legitimate question was raised, and where to moor was the next issue at hand. Space, particularly width of a slip, becomes the limiting requirement. But then, space also is one of the attractive features of multihulls—deck space to move around on, free from the confines of the cockpit.

Step aboard any multihull and it is obvious how much real estate they offer. Even small models seem expansive. The beam of the typical catamaran is half its length, and trimarans are even wider, sometimes as wide as they are long. Aside from increasing space, beam also boosts stability without adding ballast. The early Pacific Islanders created these form-stable craft for fishing and interisland commerce and voyaging where natural island harbors were few, so the boats had to be light enough for crew to carry them up the beach. Today’s modern multihulls are still lighter than contemporary monohulls, but the larger ones preclude the option of dry sailing them from the beach. They require more marina space than monohulls, and the limited number of slips to accommodate them can be a problem. As someone once put to me, “Multihulls have a poor ‘stacking factor.’”

With catamarans and trimarans becoming more popular, they demand mooring solutions. Some marinas offer shallow-water slips to multihulls, typically at the inboard ends of docks, next to the seawall, because multihulls either have shallow keels or retractable boards. Some marinas also designate the end ties as multihull slips in areas not used for transients. Even though these boats protrude farther into the channel than monohulls, the extra space their beam occupies is relatively small. With multihulls crowding waiting lists for marina slips, builders were prompted to consider folding systems to “improve their stacking factor.”

Without ballast, smaller multihulls up to about 30 ‘ (9.1m) can be dry-stored on a trailer, and most launch ramps easily accommodate over-width boats. If the boat’s beam can be reduced to the legal highway width of 8.5 ‘ (2.6m), the owner can store the boat at home. Today, folding trimarans and catamarans are common sights on trailers in storage yards and backyards. Various folding systems have evolved to support this need, especially for the backyard builder. Some beam-reduction systems allow the boats to be folded and stored in the water in conventional-size marina slips, while other systems facilitate efficient storage or provide street-legal trailering.

Folding Systems

Basic folding systems are separated into several categories:

• take-apart akas, the simplest beam-reduction method
• telescoping akas (sliding beams)
• simple horizontal hinge
• complex horizontal hinge systems
• vertical hinges (swing wing)
• complex swing wing

The following overview of folding systems illustrates how these mechanisms work. It is not intended to be an exhaustive listing of available folding designs. I’ll address two-hull boats (catamarans and proas) first, followed by trimarans. Each type has its challenges and advantages. All are separated into two more categories: transportable boats and trailerable boats. The characteristic distinguishing between them is the time and effort required to launch, starting from an on-the-trailer folded condition. Trailerable implies the possibility of daily launching, requiring less than an hour from trailering to sailing. Transportable denotes a road-legal trailer package but with a longer assembly time to sail away. It might even take more than one trailer load, and considerable assembly time. Legal width in this category could extend to 10 ‘ (3m) wide if OVERSIZE LOAD signs are used (consult local laws). Transportable boats usually require seasonal transport with storage in the water during sailing season and dry storage in the winter. Both categories benefit from the ability to “go to weather at 65 mph” to reach any suitable launching site, even hundreds of miles from home. This opens the possible sailing venue to any water body with a launch ramp and road access, and some trailerable and transportable boats can be delivered anywhere in the world in standard shipping containers.

Catamarans and Proas

The WindRider 17′ trima- ran’s telescoping tubular akas are secured with pins

Hobie Cats and other beach cats are familiar sights around lakes, beaches, and harbors. They are usually built to 8 ‘ (2.4m) beam and do not need folding systems. The 19 ‘ (5.8m) Tornado class catamaran at 10 ‘ wide uses a side tilt-up trailer to reduce beam. Larger catamarans needing folding systems have greater challenges than trimarans of the same length, for a few reasons: The hulls are normally bigger (and heavier) than amas for the same length trimaran; the mast is stepped on the center of an aka, midway between the hulls, which means the aka must be extra strong; and there is no easy means of supporting the hulls while the beam is being expanded to the sailing position, requiring that the trailer have an expanding-beam function. As a result, folding systems are less common on cats and are usually of three types:

• folding akas along the centerline or to a center pod
• telescoping akas
• take-apart akas

On this Wharram cat, the akas are securely lashed into “deck alleys.”

Designers have used telescoping akas, but production boats generally avoid the associated complexity and cost. The mechanically straightforward take-apart feature has successfully been used by many boats, like the 27 ‘ (8.2m) Stiletto Cat and others. Generally, the assembly of these boats takes some time and muscle, which relegates them to the transportable category. Stiletto Cat advertising suggests a four-hour setup time, but in reality, it is much longer. All the James Wharram–designed catamarans up to 63 ‘ (19.2m) are held together with rope lashings and can be dismantled for transport. The required time and effort are generally proportional to the length of the boat.

Note that the Gougeon 32 ‘ (9.7m) sailing catamaran is unique, at 8 ‘ wide, without folding capability but with a water ballast system to make up for the lack of form stability.

The large main hull of a typical smaller trimaran offers a larger interior space than a comparably sized catama ran, a deep footwell in the cockpit for comfortable seating, and a folding system for trailering with the amas connected to a well-supported main hull. In addition, the mast is stepped on the main hull, with the headstay attached to the bow, not to the akas.

Trailerable trimarans come in all sizes to about 32 ‘ long, with transportable designs somewhat longer. The latter types tend to have larger interior spaces and less complex connectives. To a certain extent, manufacturers were willing to add cost to the folding system to reduce setup time. Folding capability on or off the water also adds to the design challenges.

Take-Apart Aka Systems

This is the least expensive method and easiest to achieve for the home builder or the manufacturer. The akas may be built-up wood box beams or tubular metal. Each beam is secured to the hulls by through-bolts, bolted straps, plug-in sockets, or lashings. Tubular aluminum beams are the lightest but most expensive. Regardless of attachment method, the hulls must be supported in their respective positions for the akas to be installed. In small vessels, this can be an abbreviated procedure, but larger vessels will require a special trailer to hold the disconnected amas while on the road.

The Chesapeake Light Craft 15′ single outrigger canoe akas lash into saddles on both hulls.

Telescoping Aka Systems

The telescoping option is limited to boats where the total stack-up width and length dimensions of the hulls and fully retracted akas do not exceed the legal road limits. The WindRider 17 is a good example. The boat is supported on “high bars” on the trailer, leaving the amas free to be moved in or out. The simplicity of the akas and trailer-support system reduces cost and launching time.

In larger vessels, this system has been applied to reduce width for storage in marina slips. For these boats, the sliding system is large and complex, usually requiring some sort of power to make the telescope slide. Because the sliding mechanism requires a small clearance between the sliding members, the akas will move slightly during sailing, which is difficult to avoid.

The 1970s-vintage Telstar 26 features a simple hinge-down system with a bolted con- nection on deck and a bolted strut below.

Simple Horizontal Hinge Systems

Early trailerable trimaran designs often incorporated a simple hinged beam-reduction system to fold both sides down. Boats to about 25 ‘ (7.6m) with a 16 ‘ (4.9m) beam could be made to fold to 8 ‘ . At the ama end, lifting the hull, sometimes with attached wing deck, could require substantial muscle or a mechanical lift. Even for smaller boats this task may be beyond one person’s capability. Normally, bolts and plates between the members secure the hull for sailing. On the Searunner 25 and Constant Camber 26 (7.9m), double-hinged tubes are bolted to tangs on the main hull.

The Searunner 25 trimaran has a hinge mechanism on its metal-tube A-frame akas that secures with bolts at both ends.

Commonly, simple hinge systems require that the main hull be positioned rather high on the trailer so the amas clear the trailer wheels beneath. A disadvantage is that the trailer must be submerged more deeply than usual for the boat to float off. Compared to the Telstar system, the Searunner 25 offered some improvement by positioning the hinge point at the top of the cabinside, raising the folded ama slightly.

Complex Aka Hinge Systems

A complex system for folding multihulls, much like a garage door lift linkage, was developed and patented by Ian Farrier for his trailerable trimaran designs. It allows one person to fold or unfold the boat while it’s afloat. Before launching, the mast is stepped and secured with lower stays. Note that folded storage in the water for long periods is not practical because the immersed ama’s topsides will gather marine fouling. In addition, the arrangement of the support linkage arms has a very shallow angle with the aka, causing them to be highly stressed, which adds significant weight and cost.

Unfolding it requires help from friends.

A complex folding system I developed has only four attachment bolts and a wide-angle strut brace. It is very light but requires folding prior to launching. It relies on a simple roller dolly on a beam attached to the trailer to support the ama during folding and unfolding.

Swing-Wing Systems

In-water storage of folding trimarans is generally limited to swing-wing designs, where the hulls all float on their respective waterlines, either folded or unfolded. Many variations have been used in production boats, and among the most successful is the Quorning-designed Dragonfly. It has hinged arms supported by a “waterstay”— a diagonal cable under the arm to counteract cantilever aka loads. The outer end of the arm, on the ama deck, pivots on a single pin. The waterstay becomes slack when the boat is folded, leaving only the hinge to support the ama in the folded configuration. I’ve seen one folded boat that was damaged while moored at the dock in strong harbor waves when the ama climbed onto the dock. Swing-wing designs stored in the water must provide strong vertical support for the ama in the folded condition

A swing-wing aka system on the Borg Quorning–designed Dragonfly 32 is further supported by a waterstay when rigged for sailing. The akas can be adjusted in and out while in the water and for storage at the dock.

The main challenge of the swing-wing system is to get all the pivot axes parallel because they must rotate about 90° without binding. If there is any depth to the structure, this accuracy is critical, as the pins or pivot axles could be quite long, so even a small inaccuracy will make the system difficult to assemble, let alone pivot smoothly.

Folding Multihulls with Flat Swing-Wing Akas

The most basic swing-wing system is the flat aka configuration developed by Jim Brown. He avoided the need for perfect parallel alignment of all hinge axes because the beams are not very thick, and the pivot-pin holes can have additional clearance. For the swing system to operate without binding, spacing of the pivot points must be identical on all the swing arms. The system’s downside is strength, because the aka must support all the heeling loads in a relatively narrow beam. For some boats, a waterstay may need to be added to increase cantilever strength and reduce deflections when sailing.

The Seaclipper 16 flat swing- wing akas are made from common dimensional lumber and pivot using steel bolts.

A logical improvement in strength for swing arms is to add a truss, with triangulated strength that will easily bear all the heeling loads from the ama. Here again, it is essential that pivot axes be in perfect alignment to avoid binding. To my eye, open trusses in sleek yachts are never beautiful, but they offer higher strength for lower weight.

Complex Swing-Wing Systems

If the akas are not flat along their full length, it is more difficult to achieve a smoothly pivoting system. My latest boat, Syzygy (pronounced, sis-a-gee), is a case in point. Flat akas offer little variation in styling—flat is flat. To add underwing clearance and more attractive aesthetics, many designers favor the arched aka. This configuration allows the aka to approach the ama hull from above and connect through the deck for more usable immersion of the ama buoyancy, and to keep the aka above the wavetops.

This system has arched akas with an upward angle (dihedral) as they extend from the main hull and descend with a smooth curve onto the ama deck. The pivot axis must also be inclined, normal to the surface, to allow it to pivot. To make life simple, the vertical centerline of the ama is inclined inboard at the top by the same amount, which aligns all the pivot axes with the ama vertical centerline. If the beam is level fore-and-aft, when the ama is folded inboard, it is positioned rather low, due to the arch. To compensate, the akas must be given a negative angle of attack to make the folded ama arrive in the same position as a simple flat aka system. It’s a good challenge for any boatbuilder to get it right and a good use of a digital level. The angles in Syzygy were 8° dihedral, and a nega tive 5° angle of attack. The aka pivot surfaces must be perfectly parallel on both ends—at the inboard aka pivots and the ama deck pivot tables.

Jan Gougeon designed and built strings, a 40′ swing-wing catamaran with carbon- tubular-truss swing akas built over foam mandrels.

A late iteration of the Telstar 26 became the Telstar 28 with a vertical-axis swing-wing system. This production boat is no longer manufactured but was unique for its faired wing and attempt to hide the folding system from view. It also featured an electric linear drive to fold/unfold the heavy akas.

For transporting folding multihulls on the highway, road trailers must have some specific attributes to properly support the hulls. Most models use transverse cradle supports under the hull at major interior bulkhead positions. It is important to install bow guides on the trailer to get the hull to settle in exactly the right place when retrieved from the water. Rollers beneath the hull are not recommended, as they tend to distort it and potentially cause damage. The amas require enough support so the folding mechanism is not carrying the load when being towed.

For swing-wing boats, there is a significant change in the center of gravity between folded to unfolded configurations. Normally, the amas swing back when folded and swing forward for the sailing position. If the trailer has the proper tongue weight for towing on the hitch with the boat folded, the weight will increase when unfolded. For trailers with telescoping tongues, tongue design must accomodate that weight; otherwise, the extended tongue may bend severely during launching or retrieval.

Homebuilt wooden trailers are popular for these specialized boats, and some designers provide plans for them. Without much metal in them, they will probably float, which sometimes leads to difficulty at launching. Adding some steel channel to the bunks can solve that. However, floating is not an undesirable feature if a trailer floats level but is submerged enough to maneuver the hull into the bunks, and the hull settles into the right place automatically. Floating trailers also never run off the end of the ramp.

Conclusions

There’s truth in the humorous claim that “the new family yacht has to look good behind your SUV.” But while many of the latest small boats are daysailers, folding multihulls have expanded the trailerable and transportable boat size to include those with weekend cruising capability, up to about 32 ‘ . As we’ve seen, those essential folding or retraction mechanisms are not simple and must be carefully designed and engineered, even by the home builder. But for owners of these boats, seasonal storage and slip availability are no longer problems. And the overall reduction in total cost can bring owning a boat within reach for many more people. What’s not to like about that?

About the Author: John Marples has designed, built, and rigged many sail- ing vessels. His portfolio includes doz- ens of wood-epoxy composite sailing and power multihulls to 110′ (33.5m). He operates Marples Marine , a multihull design and engineering firm in Penobscot, Maine

Dieter Loibner | Professional BoatBuilder Magazine

Nomenclature

Multihull designers have developed some useful, specific names for components, mostly derived from the Pacific Islander language.

Aka (ah-kah) refers to the crossbeam structure of any multihull. Designers used to call them “cross-beams,” but writing that on hand-drawn plans took up too much space and time, so this shorter Polynesian name became the standard.

Ama (ah-mah) is the Polynesian name for the outer hull of a trimaran or proa. They were formerly named “floats” or “outer hulls” (never pontoons), but again, ama is shorter.

Vaka (vah-kah) is the Polynesian name for the main (largest) hull of a trimaran or proa. Since it can be confused with the other names and is not very descriptive, most designers have opted for the term main hull.

Waterstay is a diagonal stay, metal or synthetic rope, below the aka, between the main hull near the waterline and aka near its outboard end. This stay counteracts the upward load from ama buoyancy when the ama is immersed.

—John Marples

The Crossbeam (Aka) Structure 

T he essential function of any crossbeam (aka) system on a multihull is to structurally connect the hulls in a way that resists all the forces generated when sailing. Heeling forces from lift on the sails must be transferred to the leeward hull by the aka structure. The forces on the akas are complex, composed of cantilever bending due to heeling loads, twisting of the structural platform, and horizontal bending caused by drag from the ama’s forward motion through the water. The heeling force, resisted by the buoyancy of the ama, pushes up, causing cantilever bending loads in the akas similar to the forces on an airplane wing. Torsion is created when the sails’ lift pushes the leeward ama bow down, while the shrouds supporting the mast pull the weather-side ama stern up. Drag from the leeward ama tries to bend the akas toward the stern, and forces from the windward shroud tend to pull the aka forward as well as up. These forces all act together at the attachment points on the hulls. In most cases, torsion is resisted by the tubular hull and cabin structure itself. Heeling is countered by the cantilever strength of the aka beams and is sometimes strengthened by diagonal waterstay cables beneath. Drag forces can be resolved by the fore-and-aft strength of the akas or by adding diagonal cables between the akas. Each folding system must accommodate these loads through all the pivoting components in the structure.

Of key interest in aka design are the loads imposed on the ama hulls by the seaway when sailing to windward. These hulls are subject to significant loads on the outboard sides. The windward ama is pummeled by wavetops, and the leeward ama is pushed sideways due to leeway. Since the aka system is characteristically attached through the ama deck, these forces are trying to rotate the ama keel inboard, toward the main hull, in either case. The same is true for catamarans, concerning the aka loads where they emerge at the hull inboard sides. These loads can be calculated to estimate the strength required for any configuration and should be part of the design’s stress analysis. If centerboards or daggerboards are located in the amas, those rotating forces are significantly increased.

Of further interest in swing-wing designs is the clearance between pins and brackets in vertical pivot mechanisms. When sailing, the forces at the hinge pins can change from positive to negative repetitively, creating noise and wear. The wear will eventually elongate the holes, reduce pin diameter, and become a maintenance problem. Designs like the flat wing can be tightened to eliminate movement, which will eliminate wear. Amas with waterstays tend to put the akas in compression and stop the vertical deflection that would be normally carried through the hinge pins. In that case, the pins would be loaded in only one direction and not be subject to cyclic ± loads. —J.M.

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Boat of the Year 2020 F101: Best Foiler

• By Dave Reed
• Updated: December 10, 2019

At A Glance

Price As Sailed: $24,750

Design Purpose: Learn to foil, advance skills

Crew List: One or two

Rob Andrews and his ­business partner Alan Hillman have been teaching foiling for a few years now, and one thing they’ve learned is we get better by sailing, not by swimming. Thus was the genesis of the F101, a craft with which they could teach the fundamentals of foiling—without the crash and burn. But it’s not just a learn-to-foil boat, either. It’s a platform with which new and experienced converts alike can take their ­foiling skill set to a higher level.

The key to mastering the F101, Andrews explains, is grasping righting moment. With the trimaran platform, you get plenty of it, as well as a stable boat that’s more forgiving than any other small foiler. “The trimaran configuration gives you righting moment direct from the foil in the middle hull,” he says, “and gives a measure of safety. It’s hard to capsize the boat.”

The judges learn as much when it comes time to sail the F101. In 15 knots and more, and a steep Chesapeake chop, Powlison is first to give it a go. He settles into the boat, gets his bearings, perches skittishly on the weather hull, sheets on the mainsail (no need to use the boat’s gennaker above 12 knots) and off he goes like a bat out of hell, popping up on the foils without even trying.

“The trick is getting used to the sensation of heeling to windward,” he says. “It takes a bit of trust. Once foiling, it’s quiet and fast, and I felt like I had to be really active on the mainsheet to keep it on the foils.”

That’s true of any foiler, but the beauty of the F101, the judges agree, is when you do lose it, it’s no big deal. The boat drops off its foils, the bows auger in and you get a face full of water; but just reset, bear away and try again.

“The hull shape picks up the buoyancy gently,” Stewart says, “which makes it depress smoothly and prevents it from pitchpoling. When I dumped it a few times I thought I was going in, but not a chance. You quickly realize there’s plenty of floatation there to save you. In flat water, with one day of training you’d get up to speed quickly.”

When teaching people to foil, Hillman starts with “skimming,” a ride height barely above the surface. As the sailor becomes more accustomed to how the boat behaves, there’s a simple line adjustment at the foil head: Dial it up one setting and increase your ride height.

As you’re sailing, the foil wand hanging behind the trailing edge effectively feels where the boat is riding relative to the water and actuates the main flap. In light winds, it gives you more lift, and the boat pops up on the foil. Get too high, and the wand drops down even ­further, forcing negative lift on the flap, which brings you back down to your desired height and prevents the foils from breaking the surface.

In terms of construction, the judges praise its carbon-and-epoxy build quality and the all-up weight of 180 pounds, which makes it easy to get to and from the water. With the F101 sitting on its dolly in the boat park, going sailing is as simple as pulling back the covers, hoisting the main and launching from a dock, beach or boat ramp with minimal fuss.

“What I like about it is that it’s one of those boats that you buy and don’t need to add anything to it,” Allen says. “There’s ­nothing to change out or upgrade.”

For simplicity, the boat is set up with adjustments that let you ratchet up the experience as you climb the learning curve. On the rudder foil, for example, there is a clear numbering system so that as you twist the tiller extension, you change the rudder rake. The baseline setting is zero, and it’s the same for the main foil. The only thing left is to balance the forces with the mainsheet.

“When I first got up on the foils, I was thinking to myself, ‘This is too easy; I should be working harder,’ ” Powlison says. “As they said, this boat solves a lot of the problems associated with other foiling dinghies. It’s a great high-performance boat that represents the next step in making foiling accessible to the public.”

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Published on October 27th, 2017 | by Editor

Foiling for Dummies: The Boat

Published on October 27th, 2017 by Editor -->

The development of the all-new TF10 foiling trimaran continues as it seeks to be provide a flying experience to sailors of all skill levels – and not just experts. Here is an update on the project from Thijs van Riemsdijk of DNA Performance Sailing.

Port Ginesta, Spain (October 27, 2017) – Thanks to an ingenious combination of Z-Foil Technology and electronic foil control, the TF10 replicates much of the performance of a modern foiling America’s Cup boat but without the crashes, flips, or power requirements.

The 36-foot long racing sailboat is versatile and exciting in all weather, easily sailing at 2-3 times the wind speed in lighter air and comfortably flying along at 25-30 knots in stiffer breeze.

Designed by Southern California-based Morrelli & Melvin, the same team behind both the first foiling multihull (Team New Zealand’s AC72 Aotearoa) and the foiling Olympic catamaran, Nacra 17, the TF10 was commissioned by a group of Newport, Rhode Island-based sailing enthusiasts looking for something entirely different.

“As a group, we knew we wanted something that pushed the boundaries of what is possible in foiling boat design, and it looks like the designers and builders have created something completely unique and exceptional,” said Dr. Malcolm Gefter, owner of Hull #1 and the driving force behind the new boat and class.

Dr. Gefter explained that he and rest of the TF-10’s first owners are all experienced racers trying to create a class with state-of-the-art performance but without the kind of “arms race” and cost escalation from which most grand prix sailing classes suffer.

Netherlands-based builder DNA Performance Sailing conducted two valuable weeks of sailing and sea trials along Spain’s Costa Brava, assisted by multiple catamaran racing World Champion and DNA advisor Mischa Heemskerk , who said the learning curve was ‘steep but manageable.’

“We’ve had dozens of people steering and crewing the boat here in 14 days, and not a single person got off the boat without a big smile on their face,” said Heemskerk, referring to not only potential customers, but also the journalist judges who came specifically to Spain to test the TF10 and several other yachts nominated for the prestigious European Yacht of the Year competition.

“A number of the journalists seemed uncomfortable at first, going from the other champagne-filled charter yachts to our little speed racer, but after a few minutes behind the tiller, we couldn’t get them to put it down!” he said.

As the testing period entered its final phase on Wednesday (Oct 25) morning, a perfect Northerly breeze rolled in. Led by Heemskerk at the helm, the full crew immediately set off for another session, this time with Spanish yachting photographer Tomàs Moya in tow.

With a crew of experienced sailors aboard the racing yacht and for the first time, no guests, crew continued to test new settings without drama. The boat easily accelerated past 25 knots in the quiet, flat water – a perfect beginning to a day scheduled for the new owner’s first sail since the boat was splashed in Holland early this summer.

But just minutes into the sail, a loud “bang” announced the day wasn’t as perfect as they’d hoped: the high-modulus carbon fiber mast crumpled to the deck immediately, breaking in parts on the way down.

A-Class and F-18 catamaran world champion Heemskerk is no stranger to dismastings, especially with his extensive work on the fastest and most modern of foiling boats, but he was surprised to see the mast let go in such light air.

“It seems we may be quite a bit faster than the simulations predicted, which means we could be developing too much power for the mast design,” said the Dutch racer, who said breakages have been an important part of the development of all foiling boats – especially the big ones.

“Foiling in big yachts has only been possible for a few short years, so sea and sail trials are an extremely important tool to find the weak links in these cutting-edge designs,” he said.

“The silver lining here is that we had a great month of sailing with a respectable showing for the Yacht of the Year competition, we learned a ton about the boat, and aside from the mast and a couple of insignificant bits and pieces, the boat performed flawlessly,” said Heemskerk.

As a longtime research scientist and pharmaceutical inventor, Gefter knows firsthand the tough road that innovation can require, and the former Professor of Biochemistry Emeritus at MIT was introspective when he saw the topless racing machine sitting at the dock.

“The first of what my students used to call ‘Gefter’s Laws’ may apply here: If an experiment comes up with exactly what the result you wanted on the first try, you will never be able to replicate that experiment again,” said the former professor, adding that “We wanted to change this sport, which is why we picked designers and a builder who truly understand how to push the envelope, and if it doesn’t break in the experimental phase, you just are not trying enough.”

Dr. Gefter said he was pleased the team was working so hard to identify any issues, and that he was confident the boat would ready to race in South Florida over the coming winter.

Additional details: https://www.tf10class.com

Photos: Tomàs Moya/DNA Performance Sailing

Tags: TF10 Trimaran

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The coolest catamarans and multihulls of all time

• Toby Heppell
• April 19, 2023

We asked top sailors and marine industry gurus to choose the coolest catamarans and multihulls of all time, here's what they came up with

As with beauty, coolness is in the eye of the beholder. While for some, speed is secondary to function or comfort, inherently any list of coolest catamarans and multihulls is likely to tip towards the high performance designs, whether they are historic trend setters or modern record holders.

We’ve asked a plethora or personalities from the sailing world, from top designers to racer for their thoughts on the coolest catamarans and multihulls. Each selection holds a special place in the heart of one of sailing’s biggest names. Reading about their favourites demonstrates it isn’t always the absolute latest technology that makes some of the boats the coolest catamarans and multihulls out there.

The Coolest Catamarans and Multihulls

Phaedo – mod 70.

“In terms of complexity for speed, there isn’t anything else which has such a good ratio as a MOD 70,” says British pro-sailor Sam Goodchild. “We’ve been over 40 knots [boatspeed] on them, and with Phaedo we used to sail for up to 200 days a year, all around the world, with just two shore crew. We were sailing offshore with just five people, so you’ve got super high performance for relatively easy upkeep.

“We’d be doing the Caribbean regattas against boats like Comanche , they’d have 20-something people on the rail and we had five, doing circles around them! Then we did all the transatlantic races – for me it’s an amazing boat.

Gitana 17 – Ultime

“The Ultimes to me are the most technologically advanced and fastest boats that you can still go offshore with, at incredible speeds and at the same time a robustness and all round performance: 30 knots upwind on the ocean! So I think they are technically the peak of sailing at the moment,” says Co-Owner of The Ocean Race , Johan Salen, who nominates the giant trimaran Maxi Edmond de Rothschild, also known as Gitana 17.

Gitana 17 is a 32m fully foiling trimaran built to a Verdier design to compete in both crewed (by a team of six) and solo races and record attempts. Skippered by Charles Caudrelier, it has won the Rolex Fastnet Race , Transat Jacques Vabre and Brest Atlantiques.

Aerial images of Francois Gabart onboard Ultim MACIF, training before the Round the Word Solo Handed Record, off Belle Ile, on October 16th, 2017 – Photo Jean-Marie LIOT / ALEA / MACIF

MACIF – Ultime

“This is a boat only a handful of people have ever been aboard but it’s a boat all the cool kids would really love to sail,” says Dee Caffari – the first woman to sail non-stop round the world in both directions.

“It’s the coolest yacht in the world because it’s very, very fast and because François Gabart set the 24-hour record of 851 miles all on his own.

“And he is very cool himself!”

PHOTO CHRISTOPHE LAUNAY / DPPI – Alain Theabault and his crew ( Jacques Vincent – Yves Parlier – Jean Le Cam – Robert Douglas )

Hydroptère – Speed record breaker

“I thought Hydroptère was the most incredible boat for a long time,” says Vendée Globe solo sailor Pip Hare of the groundbreaking 60ft (18m) foiler. “It was the first flying boat we’d ever seen. It crossed oceans and also was going for the 50-knot record.”

The experimental hydrofoil was the brainchild of skipper, helmsman and project founder Alain Thébault, together with design studio VPLP. It was built on principles Thébault proved as early as the Nineties and launched in 2008 – over a decade decade before the Ultimes evolved into the foiling offshore multihull class we know today.

Photo: Thierry Martinez

B&Q Castorama – Round the world record breaker

“For me ‘Moby’, as Ellen MacArthur’s trimaran was known, is one of the coolest yachts,” says top yachting photographer, Thierry Martinez of Ellen’s B&Q Castorama.

“In this photograph Ellen is 100 miles off the finish line at Ushant just before she broke her solo round the world record in 2005. I wasn’t working for Ellen at this time, but I had followed her from the boat’s launch in Sydney to the end of successful broken record.

“The trimaran was extra cool because it had two sides: one blue side with a French sponsor, and an orange side for an English sponsor. To shoot both sides was a challenge.”

USA 17 – 2010 America’s Cup winner

“I’d have loved to sail on the America’s Cup AC72 cats in San Francisco in 2013, they were so invigorating,” says Thomas Coville – one of the world’s most successful ocean racing skippers. “Those boats were when Larry Ellison just let free in the America’s Cup and pushed the limits. But perhaps even cooler was the big trimaran challenger, USA 17 [in 2010]. When you saw the size of the wing and the size of Jimmy Spithill steering the boat, and flying on one hull, I think it was totally amazing.

“We should give a medal to the generation who was on the America’s Cup in San Francisco for creating so many new ideas and new dynamics, but for me the first step of sailing by flying was when those guys arrived with a trimaran with wings. Today we are trying to recreate that kind of a step by foiling around the world.”

Foiling F50 – SailGP ‘s foiling catamaran

“Without question the SailGP F50 is the best boat that I have ever sailed,” says America’s Cup skipper, 49er gold medalist and foiling Moth world champion, Nathan Outteridge. “The headline top speeds of over 50 knots are impressive, but there is so much more to these incredible boats.

“The boats are inherently unstable, and so require constant adjustment of the foils to keep them flying at optimum levels. Initially the boats were very hard to sail; the foils are very unstable and not as forgiving as were used in the Bermuda America’s Cup , but with the help of sophisticated computer aided flight controls and user-friendly flight controller hardware the boats are now far easier to sail, which makes for better, closer racing.”

Biscuits Cantreau 2 – Revolutionary trimaran

Biscuits Cantreau 2 was a Formula 40 trimaran designed for Jean Le Cam in 1987. “Formula 40 was a class born in France with a very simple rule for multihulls for offshore racing,” explains Lauriot–Prévost, co-founder of VPLP yacht design. “The boat had to be 40ft long, about 40ft wide, the mast height was 21m, with a sail area of 90m2, and weigh 2.3 tonnes minimum.

“In 1986 the majority of the fleet were catamarans, but we started with a trimaran. For 1987 we sat down with a blank sheet of paper. The challenge was to be at the minimum weight with a trimaran. We wanted to go for a trimaran which sailed like a catamaran, flying a hull. That was really something very new.

“Most trimarans sailed on the main hull, with floats to balance the boat for transverse stability. We had the crew on the windward float, three rudders, and aimed to sail flying a hull. She was faster than all the catamaran fleet, and beat them all.”

Olympus Photo – The original modern multihull

“The late Mike Birch ’s Olympus Photo, designed and built by Walter Greene, sits at the root of all modern multis,” says Guillaume Verdier – one of the most talented and successful naval architects of the modern era. “Mike and his boat began the legend of the Route du Rhum and made offshore racing so popular. With his 12m-long yellow trimaran he beat Michel Malinovsky on his 21m (69ft) monohull Kriter in 1978, by less than two minutes – extraordinary considering they didn’t know each other’s position at the time.

“Greene’s design was a cold moulded wooden-epoxy coated boat with small longitudinal stringers. At the time it was a very original way to build boats, developed by the Gougeon brothers.”

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Flying Mantis: Foiling Trimaran Seeking New Investor

If you ever fancied becoming the proprietor of a boatbuilder then now may be the perfect opportunity.

Flying mantis hits stormy waters.

The ISBF Flying Mantis team who developed the Flying Mantis foiling trimaran is seeking a new investor.

This innovative foiling dinghy was developed by Simon Chrispin, and the boat won Dinghy of the Year in 2018 thanks to its innovative approach which made foiling more accessible to less experienced sailors. 

The team had been working on refocusing this boat away from the luxury product market, where it had been listed as one of the superyacht top ten water toys, towards the mainstream, bringing the boat cost down to £20k for a relaunched version that would include some interesting new design tweaks.  

Unfortunately, the existing investor is no longer able to continue with the project for personal reasons. Anyone interested can contact the owner, Simon Chrispin, at [email protected] , www.flyingmantis.com .

About the boat

Hand built and high specification, with a cutting edge design and custom paintwork, this foiling trimaran is fast and fun.

With the world of foiling growing greater every year, and becoming more accessible to the less expert sailors among us, the Flying Mantis team see it as a sport that’s here to stay. This boat has been designed with this in mind – it can be sailed with a conventional daggerboard that is interchangeable with the central T-foil. This way, sailors can gain confidence with the boat before progressing forward.

Creating a portable boat was also at the forefront of the design. This foiling trimaran is towable, by a car, with the hulls still assembled, and the outriggers can be derigged and fitted without taking the mast down, taking complication and time out of the rigging process.

Aron Smith, Chief Instructor Lake Garda (Andrew Simpson Watersports Centre) says:

“Won’t lie I was a little nervous going out in the 20 knots+ Pelar, however after five minutes the nerves were all gone and it could have been 15 knots and flat water from the way the boat handled.”

For more investment info contact Simon Chrispin:

[email protected]

www.flyingmantis.com

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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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16 Best Trimarans For Sailing Around The World (And a Few For Daysailing)

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Trimarans are growing in popularity worldwide, due to their light construction and high stability these multihulls are even faster than catamarans. Trimarans are still one of the lesser-known boat types so in this article ill be checking out some of the most popular models.

The best trimarans include: 

• The Neel 43 
• The Neel 47 
• Dragonfly 28 
• The Pulse 600 
• Corsair 37 

These tris are built with your safety in mind while also packing powerful speed and a wide array of comfort features to optimize your sailing experience , some are even foldable making them possible to load on a trailer and transport to the sailing destination of your choosing.

In this article, I have created a list of the 16 best trimarans in the market and their unique features. You’ll also learn the best options for different purposes such as circumnavigation, weekend sailing, racing, and more. 

Table of Contents

What Is a Trimaran?

A trimaran is a multi hulled sailboat with three individual hulls; the main hull ( vaka ) and a pair of outrigger hulls ( amas ). These smaller outrigger hulls are attached to the main hull using beams. 

While trimarans have a rich history dating back nearly four millennia, these types of sailboats have only gained popularity in the late 1900s and early 2000s. 

Trimarans are primarily used as personal boats for sailing enthusiasts or racing. These sailboats draw their versatility from their lightweight design, making them faster and easier to handle at sea when compared to single-hulled boats (monohulls). Additionally, the three hulls also contribute to better stability, making it very hard to capsize (although more likely than a cat according to this study)

Trimarans come in various sizes, and some can be as small as 19 feet (5.8 meters) in length, while others go up to 60 feet (18meters). They’re also used for different purposes. Most trimarans are used for racing and recreational purposes, although some units are still used as ferries.

As with all things, to find out which is the best we need to understand what it will be used for. There is a big difference in requirements between a boat used for day sailing compared to offshore around the world sailing.

The list below highlights the best trimarans for different purposes.

Best Trimarans For Cruising, Liveaboard and Sailing Around The World

The Neel 43 is a French trimaran best suited for cruising. Its key features include: 

• Easy maneuverability on the open sea by only a small number of crew members 

This unit is also built for comfort, ideal for more extended travels. This 43-feet (13-meter) trimaran is also made with recyclable and bio-sourced materials, highlighting the manufacturer’s commitment to environmental consciousness. 

This trimaran has a base price of  €329,000 excluding VAT. This translates to approximately $370,138. 

2.Neel 47 Possibly The Best

Named the best full-size multihull for 2020, the Neel 47 is a strong contender for one of the best trimarans in the market. This 47-foot (14.3-meter) long trimaran features optimized exterior and interior ergonomics for a unique design and look. 

Still on design, the Neel 47 is ideal for couples looking to take a weekend off or spend some time as liveaboard. It has a spacious owner’s cabin and two bedrooms. It also features a spacious living room and kitchen and is optimized to ensure comfort for a couple. 

The Neel 47 also has two basic guest cabins so your friends or children can tag along on your sailing adventure. Accordingly, this unit is ideal for those looking to explore the sea for the sheer joy of sailing. 

The Neel 47 comes at a 571,139 euro ( $643,600 ) price tag, excluding VAT. 

3. Rapido 60 The Fast and Comfortable Circumnavigator

The Rapido 60 offers a blend of performance, safety, and luxury, making it one of the best options for bluewater sailing. Measuring 59.3 feet (18 meters) in length, the Rapido 60 is an imposing unit. It’s made from lightweight sandwiches and carbon materials that provide speed and strength, allowing it to stand up to strong ocean currents. 

The Rapido 60 also has spacious living spaces and is built for comfort at all points of the sail. Its design also optimizes safety. While it’s an ideal option for circumnavigating, it’s also an excellent choice for racing due to its speed. 

This is also the same boat that The Youtube channel La Vagabond just purchased.

The Rapido 60 retails at $1,400,000 . 

4. Rapido 40

The Rapido 40 measures 39.4 feet (12 meters) in length and is ideal for cruising around the world. The Rapido 40 features twin “C” foils, which provide added lift, enhancing its speed and performance whether you are sailing downwind or upwind. 

Because it has C foils, this trimaran doesn’t have a central daggerboard, increasing interior space. Accordingly, it’s an excellent option for couples looking to cruise and enjoy great performances .

The Rapido 40 is made from high-tech all-carbon materials for a lightweight yet sturdy design. This material is also used for the countertops and furniture, and the cork flooring adds a touch of style.

This trimaran retails for $595,000 , making it a cheaper option than the Rapido 60. 

5. Dragonfly 40

The Dragonfly 40 measures 40 feet (12 meters) in length. It features high-comfort standards, making it one of the best trimarans in the market for taking your family for a cruise. Because of its larger size, it has a better capacity, being capable of accommodating six to eight people, so you can bring your family and friends along. 

It’s easy to navigate and extremely safe. With a maximum speed of 24 knots (44.5 km/h), this trimaran also provides fast speeds to make your cruise even more exhilarating. 

The Dragonfly 40 retails from €509,000 exclusive of VAT, which rounds up to $572,000 . 

6. Dragonfly 32

The Dragonfly 32 is a high-performance cruiser. Like the Dragonfly 28, this unit features a contemporary design for racing. This trimaran can accommodate five to seven crew members. 

Although slightly longer than the Dragonfly 28 with its 32-foot (9.8-meter) length, the Dragonfly 32 has a max speed of 23+ knots (42.6+ km/h), making it one of the fastest trimarans for racing. This unit also has comfortable accommodation, which makes it an ideal option for a weekend cruise with family and friends. 

The Dragonfly 32 has a base price of $350,000 . 

7. Corsair 37

Thanks to a variable draft with a retractable rudder, the Corsair 37 is an ideal choice for shallow water exploration. This 37-foot (11.3-meter) long trimaran features advanced foam-cored construction designed for safety, making it virtually unsinkable. 

The carbon hulls minimize weight, this makes for a lightweight ocean exploration sailboat with blistering speeds. One of its selling points is that this trimaran has previously been used for Arctic expeditions, possibly marking it as one of the better options for circumnavigation and offshore sailing in the northern waters. 

This trimaran has a base price of $189,000 but can go up to $204,125 .

Best Trimarans For Day/Weekend Sailing

8. dragonfly 28.

The Dragonfly 28 is a 28-feet (8.75-meter) long sailboat that can accommodate up to five people. It comes in two versions: 

• Touring version: This version is ideal for families.  
• Performance version: This is built to provide optimal performance for the sports enthusiast within you. 

It clocks a maximum speed of 22+ knots (22+ km/h) and is beam-folded. It’s an excellent option if you want a high-performance, comfortable yet smaller unit for your day or weekend cruise. 

The Dragonfly 28 starts at  €188,280 inclusive of VAT, which comes to around $211,600. 

9. Dragonfly 25

Like other trimarans under the Dragonfly brand, this 25-foot (7.62-meter) trimaran is great for both racing and short term cruising. However, this high-performance boat delivers easy handling, making it perfect for couples looking to take a ride out over the weekend and seasoned sailors looking for an exhilarating racing adventure. 

The Touring version features a lightweight build and offers comfort and accommodation to keep you, and the few guests you can fit, comfortable during the ride. This trimaran also has a Sport version, which is optimized for racing. 

The Dragonfly 25 retails from EUR 86,800 . 

10. Pulse 600

The Pulse 600 trimaran is a compact sailboat. It’s made from lightweight, carbon-reinforced construction and vacuum-formed materials for optimal speed. This trimaran is an ideal option if you are looking for speed. 

It also features ample deck space, greater stability, and volume than most trimarans of similar size and build. 

This trimaran measures 19.8 feet (6 meters) in length and can be sailed single-handedly by one person with minimal effort. The Pulse 600 has a base price of $38,800 , which places it in the lower price range. 

The F-22 is one of the smaller trimarans in the market. Developed in New Zealand, the F-22 is a folding trimaran built for speed. The hulls are made from narrow fiberglass tied together using fiberglass beams and aluminum, minimizing bulk while optimizing speed. 

The F-22 is roomy and is not as pricey as other models in the market. This trimaran has two main versions: 

12. 2019 Weta Trimaran

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. Thanks to its collapsible design, this trimaran is easily stored away with minimal space demands. 

13. 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. 

14. Astus 22.5

If you’re looking for something small but still comfortable, 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. 

This trimaran also has a foldable design, collapsing to only 16 feet (4.9 meters) for easy storage. 

15. Multi 23 Trimaran 

The Multi 23 trimaran has a contemporary design, featuring a vinyl ester and PVC foam core construction. The section below the waterline is made of solid glass for a sturdy base.

The beams are made of lightweight carbon, and the trimaran features a 33-foot (10-meter) aluminum rotating wing mast for optimal harnessing of the wind. While ideal for weekend excursions with family, once rigged with the asymmetrical spinnaker will get your heart pumping.

This trimaran packs high performance at a lower cost than most other options in the market. It’s a good choice if you are looking for a high-performing unit without spending an arm and a leg. 

16. Challenger Class Trimaran

The Challenger Trimaran 15 is the best choice for persons with disabilities. It’s designed to provide disabled sailors an opportunity to explore their passion for sailing without worrying about aspects like safety or operation. 

A man named Geoff Hold circumnavigated the British Isles in 2007, becoming the first disabled person to achieve this feat. He had quadriplegia. 

Living up to its name, the Challenger can withstand harsh weather conditions while blending performance with speed. 

Final Thoughts 

Admittedly, no trimaran is best for everyone. But whether you are looking to race with your friends, take your loved ones or friends for a cruise over the weekend, or circumnavigate the ocean, you can rest assured that these lightweight trimarans will deliver speed, safety, and comfort to make it worth your while. 

These brands are innovatively designed and feature intricate safety mechanisms that make them virtually unsinkable. Give them a shot and begin your ocean adventure. 

• Basco Boating: A Comprehensive Guide & Introduction to Trimaran Yachts
• TheBoatAPP: New Trumarans: Which are the Best Ones
• Corsair Marine: Corsair 37
• Dragonfly: Dragonfly 28
• Rapido Trimarans: Rapido 60
• Neel Trimarans: Neel 43
• Yachting World: World’s Collect Yachts: Maxi Trimaran MACIF
• Yachting Monthly: Dragonfly 28 Performance
• Rapido Trimarans: Rapido 40
• Dragonfly: Dragon 32
• Dragonfly: Dragonfly 40
• Yachting World: Dragonfly 40 yacht tour: This cruising trimaran can do 24 knots
• Dragonfly: Dragonfly 25
• NauticExpo: Dragonfly 25
• Yachtworld: Corsair 37 boats for sale
• Cruising World: Neel 47 Trimaran: Best Full-Size Multihull0
• Neel Trimaran: Neel 47
• Multihull Solutions: NEEL 47 Boat Review | Cruising World
• Yacht World: 2022 Neel 47 for sale
• Farrier International: F-22
• Weta Marine: The Boat
• WindRider: WindRider 17 Trimaran Sailboat 
• Astus Boats: Astus 22.5
• Boat-specs: Multi 23
• National Maritime Museum Cornwall: Challenger Trimaran #1 – BC26

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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F1x A-class foiling catamaran

World champion, lighter = better, craftsmanship, meet the foiling f1x a-class catamaran.

This is the ultimate singlehanded foiling catamaran of the moment: ultramodern, incredibly fast, very agile, extremely strong and feather-light, in an aerodynamic and ergonomic design. The perfect total package, packed in 1 foiling catamaran. This is the world’s coolest boat for singlehanded races and the winner of several A-cat world championships and many other sailing races.

The 2020-F1x A-cat is exactly the same foiling catamaran that made Mischa Heemskerk Vice-World Champion at the Herveybay Worlds 2018 in Australia and World Champion at Weymouth 2019. All our foiling F1x A-class catamarans come straight, ready to race and ‘Mischa-tuned’ from our factory.

Unique design enables top performances

The F1x A-class foiling catamaran is the ultimate reflection of our current design language. The aerodynamic design accentuates the performance qualities of this super fast foiling racing boat. The sophisticated deck plan provides clear control and minimal air resistance.

Foils The rudders and daggerboard foils used on the F1x A-class foiling catamarans are produced with the highest quality carbon pre-preg fibers. The foils are cured in our own Autoclave . Our winning foil design was created in close cooperation with Glenn Ashby and the designers of AC Team New Zealand .

Construction The F1x A-cat is manufactured entirely according to the carbon pre-preg/ Nomex production method, and cured in our Autoclave. This technology is the same as used in the aerospace industry and within other foiling boats like for example, the America’s Cup.

Design The design of the F1x foiling A-class catamaran was completely conceived by the DNA design team and made at DNA’s own yard. In the DNA design team Pieterjan Dwarshuis, Mischa Heemskerk and the renowned Dutch industrial design engineer Rudo Enserink worked closely together to create the perfect foiling A-class catamaran.

We build your new foiling boat!

Technical details.

The F1x A-class foiling catamaran has a number of unique features that improve performance. For example:

• Semi ridged trampoline. Gives extra torsional stiffness to the boat and increases its aerodynamic characteristics.
• Patented main-sheet-wheel-system. For more direct and faster trim of the main sail.
• Aerodynamically placed traveller car.
• Flexible daggerboard casings. For minimal water absorption in floating mode.
• Aerodynamically shaped ‘beams’.
• Adjustable T-rudders. Foiling with rudder differential is possible.

Specifications

LOA: 5.49 m BOA: 2.30 m Max. draught: 1.20 m Sail area: 13.94 m Total weight: ca. 53 kg Top speed: 31 kn Extra: All measurements according to IACA Class regulations.

Buy a champion's boat!

Are you excited to buy a F1x A-class foiling catamaran from DNA Performance Sailing? Please fill in our contact form:

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