Bob attached some photos of Wavelength No 3 (under construction) to give some idea of how the ply construction works.
I am now well into my sixties and have been sailing on and off since I was a teenager, initially in dinghies, and later, with a young family, I had a small 14’ “Off the beach” plastic cat which gave me a taste for multihulls. There followed many years of sailing with a reasonably substantial local Trailertri fleet, many of them modified in various experimental ways, with & without designer approval. My interest in trimaran design really started with work on developing a local ‘Trailertri Rating Rule’ in the 1980s, based loosely on the then published Micro Multihull Rule and John Shuttleworth’s ideas on the performance factors affecting multihulls. The rating was later extended to include all trailable multihull designs in the relatively small fleet contesting national trailable multihull regattas in Australia.
My interest and experience with the trailerable multihull scene led to me being offered some part time boat building work (which soon became full time) with a local company, OSTAC (Ocean Sailing Trimarans & Catamarans). My period working with OSTAC gave me detailed experience in the various aspects of modern multihull construction, including vacuum bagging techniques, then in their infancy locally.
Having terminated my job with OSTAC, it was at this point that my ideas for a new trailerable cruising tri began to coalesce. Size (this was critical) … I knew that the trend to maxi trailerable designs for extra room and comfort had its limitations, a major one being the stress of shifting around a heavy mast section and having to raise the mast on a regular basis, if full advantage was to be taken of its trailerability. As a person with a background as a potter in an earlier part of my life, I viewed the shape of the boat like a three dimensional sculpture in which form echoes function.
Despite my earlier involvement with commercial foam sandwich production and ‘one off’ cedar strip plank construction for building the often complex curves of trimaran hulls, I was still attracted to ply as a simple and economical building material without the need for higher tech processes (vacuum bagging) or materials (foam, carbon fibre).
Having worked alongside a talented pattern maker in earlier boat building days, where flexible ply was used extensively to build complex mould shapes, I was well aware of the potential of light thin strips of flexible ply. In traditional cold moulding, this strength is restored when thin strips of ply, usually cut on the longitudinal axis, are laid up in double diagonal (or multiple) layer form and covered in a light glass cloth. While successful multihulls have been built this way in the past, it is a time consuming process and results in a heavier hull than need be. Empirical testing showed that the method, in its basic form, was significantly lighter than an equivalent cedar strip plank lay up and not too different from foam sandwich. Rig … the rig is quite powerful, but still conservative as befits a cruising design and when compared with the power to weight ratio of other tris in this size range.
Wait until you read about how this new small trimaran handles :-) Some new photos of the hull are included below also. You’ll be able to hear Frank talk with Jim Brown a little about this hull re-design next week in an audio clip.
This kind of project represents exactly the kind of home-grown fun I love reading about — a sailing guy making something with wood and then going out on the water to test it all out!
Even though Tom provided lots of great information about this project on his webpage, I asked him if he’d share some feedback on a few questions I sent him. It was during the build of the skipjack that I started one of the first home boat building websites in 1996 and it’s been through a few changes over the years. I first ran across Jim Michalak designs in a Clark Craft catalog (order from that first issue of WoodenBoat).

In addition to selling plans Chuck at Duckworks sells marine items that are hard to find or over priced elsewhere. Let me first say that I did not set out to build a trimaran, but rather I had some specific criteria that I wanted and needed to meet. At the time, I selected this design because: 1) it could be car topped, 2) I could use it to paddle two (my daughter then six, now 10 and myself), and 3) to fill the sailing void without needing a trailer or slip. Before I comment on sailing performance I should note that the only major change from the design I made was the sail.
Two of my concerns while building the boat was the shape of the amas (floats) and the side mounted leeboard. For the most part, it has worked well, with the exception of in shallower water with trees — it tends to get bumped up and needs to be manually rotated back down.
Auxiliary power can be canoe or kayak paddle, even an electric trolling motor can be mounted to the rear float brace with some minor modification. Another topic to be considered for (the sailor) who’d like this kind of sailboat would be the method by which this boat gets to and from the water.
I recently converted my 4.5 meter fiberglass canoe to a trimaran I made my amas from plywood Gorilla glued and covered with dacron shrink skin Laquer and sealed multiple coats, works like a charm and lots less expensive than epoxy.
Hi Tom – In the first on-water photo above, the boat is way out of trim and squatting at the rear.
Lionel Lemonchois has chosen the Multiplast Composite Yachts to build a 24 meter (80ft) trimaran yacht Prince de Bretagne 80, hoping to bring off the third consecutive victory in his record of achievements, in the legendary race Route du Rhum. For Multiplast, building this new large multihull yacht will also be an opportunity to try to maintain their a€?builder titlea€?, following the victory of Franck Cammas on Groupama 3 trimaran yacht in the last race. 32: the size, in metres, of the largest boats of the fleet, the trimaran Sodebo skippered by Thomas Coville and Oman Air Majan skippered by Sidney Gavignet. For his part Francois Gabart, his co-skipper in the Barcelona World Race, is continuing his Figaro programme, after a fantastic 2nd place in La Solitaire du Figaro this summer. Location: Melbourne, Australia 2 metre rc trimaran project I'm building a 2 metre rc trimaran to a design by Andy McCulloch called 'Midnight Oil'. 150 Team Scarabaeus sacer sells multihull gravy holder plans by light beam Kendrick for the professional operating theater The Avalon 9 folding trimaran bequeath comprise 100 for the rest of parade normally. Headroom 6’3 Design expression and substantial entropy close to modest trimarans pattern Criteria angstrom xxii page report giving a comparison table screening 20 of these boats. Then again I expect to have too much fun sailing my new boats to think about a summer build project. At the same time, other designs were appearing locally besides the Farriers, notably Tony Grainger’s more race oriented, sleeker lightweight designs, as well as occasional imported tris like the Quorning Dragonflys. A lightweight unidirectional glass is then laid up over this structure in one operation, effectively butt strapping the exposed joins between the ply strips, to create the inside skin of the hull. It was also quick and would turn on a dime, but wouldn’t track at all unless the leeboard was down, and tended to pound just a bit in waves. This new hull got a moderate transom, slightly angled sides, and an average dihedral of 20-25 degrees.

Being able to start sailing less than 5 minutes after I get to the beach is a total delight, especially when I think about the countless hours I’ve spent assembling earlier tris after taking the hulls, amas, akas, etc. Lionel Lemonchois, skipper of the Prince de Bretagne 80 trimaran yacht: a€?a€¦ after 2 records in the Trophee Jules Verne on Multiplast yachts, the decision to work with this team was a logical one.
From now on I will document my building progress here for my fellow multihullers, if the finished tri is a success I will do proper drawings for fellow builders to build their own RT65. Location: Melbourne, Australia It's not a foiling boat like the one shown in that video although it might be later if we add lifting foils the carbon build I have in mind should be light enough to make a decent foiler. Trimaran and catamaran sailboat designs aside Ian Farrier admit boat plans kit out boats and production trailable sailboats. Maybe when I've finished my second carbon fiber Nightmare tri, I might try building a smaller "mini 36" and I can use the rig off my USOM. Indeed FONCIA was built in the space of 6 months, which equates to two fewer months than the previous monohull aboard which Michel won the Vendee Globe. Any necessary bulkheads or other frames are then fitted before the half hull is removed from the mould and turned over. The production of the 24m trimaran yacht Prince de Bretagne 80 will begin on 2 November and the launch is planned for September 2012. And here is the link the Peter Gernerts (WIESELs) RG65 Racingtrimaran - including buildingreport! Location: Germany Hey Corley, you should not build toy boats, continue with the 40 footer!!!!!!!
Second, the rear end tended to squat at higher speeds, due to lack of flotation aft to help keep the bow down. Originally Posted by luckystrike Hey Corley, you should not build toy boats, continue with the 40 footer!!!!!!!
Michel Thanks Michel, I'm aware there are faster ways of building the boat and considered using them but I've had interest from a few people about the boat and rc multihull sailing so I though I might as well produce female molds and build a limited number of boats and do some club racing rather than just a one off. Turns out that just 10 square inches of skeg area was enough to cause either lee helm or weather helm. Location: Melbourne, Australia I've nearly finished the plug for the second float hull side of the 2m Midnight Oil trimaran I've been gradually building my intention is make a female mold to cast some polyester plugs verify their accuracy and then make a final female mold when they are as close to perfect as I can get them. Her name is Acapella, Charlie Capellea€™s trimaran and a sistership to the winning boat in 1978. Because I think I’ve made just about every design mistake possible, and probably a few more. Previously useable Trimaran Designs For nursing home Builders fluorine 32SR Farrier designs are useable as either full yield boats or as plans for domicile builders.

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