Multihull Structure Thoughts

[oldmulti]

The following 41-foot liveaboard trimaran is based on a Philippe Rivière design. The tri is equipped for a circumnavigation and is claimed to be fast. The tri has Farrier type folding arms for marina storage.

Then trimaran “Polynesia” is 41 x 31.15 foot with a weight of 11,200 lbs. The 53 foot aluminium mast carries a 990 square foot mainsail, a furling staysail, a furling genoa of 376 square foot and a Code 0 of unknown area and a storm jib. The engine is an inboard 39 HP Nanni, Model: 4150 shaft drive with a 3 blade prop.

The accommodation is a forward double berth cabin, head shower, main saloon with galley and seating, cockpit and an aft double berth cabin. The layout would be good for a couple to have extended cruise with the occasional guest.

The construction is built in strip-planking, carbon and epoxy, combining lightness, strength and performance. There is some foam glass. The folding system is a Farrier type, but in this size of tri it is not an everyday event as there are runners that come from the mast to the float to help support the mast on each tack.

The performance is unknown but 10 knot averages would be possible with peaks around 20 knots. This is a serious cruiser that could take you far. The jpegs give the idea.

 

[montero]

Picture 8 nice rake.

 

[tane]

The following 41-foot liveaboard trimaran is based on a Philippe Rivière design. The tri is equipped for a circumnavigation and is claimed to be fast. The tri has Farrier type folding arms for marina storage.

Then trimaran “Polynesia” is 41 x 31.15 foot with a weight of 11,200 lbs. The 53 foot aluminium mast carries a 990 square foot mainsail, a furling staysail, a furling genoa of 376 square foot and a Code 0 of unknown area and a storm jib. The engine is an inboard 39 HP Nanni, Model: 4150 shaft drive with a 3 blade prop.

The accommodation is a forward double berth cabin, head shower, main saloon with galley and seating, cockpit and an aft double berth cabin. The layout would be good for a couple to have extended cruise with the occasional guest.

The construction is built in strip-planking, carbon and epoxy, combining lightness, strength and performance. There is some foam glass. The folding system is a Farrier type, but in this size of tri it is not an everyday event as there are runners that come from the mast to the float to help support the mast on each tack.

The performance is unknown but 10 knot averages would be possible with peaks around 20 knots. This is a serious cruiser that could take you far. The jpegs give the idea.

ABSOLUTE beaut!!!

 

[oldmulti]

John Marples and Jim Brown created the Seaclipper 28 as a simple plywood vessel with coastal to ocean crossing capability. It started as a minimalist craft with 5 foot of headroom, minimal accommodation and a strong structure that could be disassembled for transport. We have shown the design previously but this version (fully authorised by John Marples) has full headroom and swing wing arms to make it a “trailer sailor”.

Seaclipper 28 is 28.5 x 18.5 weighing 1900 lbs displacing 2650 lbs with a 32 foot mast carrying 166 square foot main and a 205 square foot genoa. The length to beam on the main hull is 8.5:1. The draft over the swing centreboard is 5 foot. The deep V floats have 140% buoyancy. The outboard is 10 HP which gives 5 knots cruise and 6 knots peak.

The main hull beam at the gunnel is 5.25 foot and in standard build format has 5.25 foot of headroom. This version has 6 foot headroom. The double bunk is really only a wide single, the floor space is too narrow to stand comfortably, 2 thin people is the absolute limit for any longer than a day sail etc. Some people have modified their boats to slightly improve things and Marples has included some mods in later plan releases.

The boats build is mainly 9 mm ply with a few stringers and bulkheads. All above water ply is covered with 120 gsm cloth and epoxy, bottoms are covered with 330 gsm cloth and epoxy. The standard version has a fixed crossbeam, this version has “swing wing” cross arms which uses solid timber components available through any good timber supplier. The swing arms use bolts (eg 25 mm) for attachment to floats and cross arm stubs on the main hull. A very simple build.

Performance is good for a simple boat. Peaks of 17 knots have been achieved and 9 knot averages are possible.

The Seaclipper 28 is a fast and simple folding trailer-able trimaran with 18' open and 8.5' folded for road trailering. The jpegs give the idea. Standard Seaclipper first jpeg then swing wing version.

 

[oldmulti]

This Kurt Hughes design is a little unusual. It looks very similar to the D32 sailing trimaran extended to 34 foot. The cross arms are different but Kurt said there can be 2 beams on the front cross beam. The main hull appears to have good accommodation. The result is a claimed to be fast cruiser. The boat was built in California and launched in 2018. Warning, I suspect this tri was a home build due to the lack of refinement and quality finish.

The trimaran is 34 x 29 foot with an estimated weight of 3,000 lbs and a displacement of 4,600 lbs. The mast is about 40 foot tall with a mainsail of 390 square foot, a blade of140 square foot, a genoa 220 square foot and a spinnaker of 680 square foot. The length to beam on the main hull is 10 to 1. The float length to beam is 15 to 1. The draft over the float based daggerboard is an estimated 7 foot. The kick up rudders are on the floats. The engine is a 20 HP outboard.

The accommodation is a forward double berth, head shower, main saloon with a galley and seating, cockpit and very wide aft double cabin.

The construction is mainly plywood with timber stringers and ply/timber frames bulkheads. The hull above the chine is flat panel. Below the chine line the bell shaped main hull appears to be cold moulded or strip planked. The aft cross beam is a mast section with a water stay, the forward cross beam is a lower mast section with a box section on top with some vertical supports between. There is a water stay underneath. The cross beams appear to be bolted to the main hull.

According to advertising,” the 34 foot is capable of comfortable 15 Knot cruising under sail and has topped out in the 20's on occasion. Modified slightly from her original design whereas the centerboard trunk is not in center mid cabin.” The term modified slightly is an understatement. Lengthening a design by 8%, shifting a daggerboard to the floats from the main hull, putting rudders on the floats and modifying the cross beams seams to be a lot more that “slightly modified”.

The jpegs give an idea of a modified design.

 

[oldmulti]

Pinta Exception 53 designed by Philippe Briand and built in the Marc Pinta yard in La Rochelle, France in 1986. The tri was conceived as a luxury fast cruiser. From the jpegs this appears to be a very comfortable boat.

The Exception is 53.1 x 32.4 foot tri weighs 23,500 lbs. The 60.5 foot mast carries a cutter rig with about 1,650 square foot in the mainsail and genoa. The stay sail adds about 350 square foot. The draft is unknown but the main hull dagger board appears to be deep and large, guess maybe 7 foot when down. The claim is 3.3 foot when the board is up. The engine is an inboard Yanmar 5JHE (39 HP) with shaft drive. The cruise speed under power is 6 knots the peak speed is 9.5 knots.

The accommodation is luxurious. It has several double berths spread over 3 cabins, each sleeping ”cabin” has some toilet/washing facilities. The main saloon has a luxury galley seating for 6 with a disappearing hydraulic powered table, a very good navigators position and reasonable views. The helming cockpit is very comfortable. The fabrics, bench tops and door finishes etc are top quality materials. Any fittings etc including the solar are high quality. The 2013 refit only cost $1.4 million which gives an indication of the owners dedication to this tri.

Performance is good, to quote the owner “Drop the daggerboard and raise the main, and she can point as high as 30 degrees with speeds in the high teens!” And also “it was not uncommon to cruise at 10-12 knots on a reach with only the genoa set.” If the weight numbers are realistic and the sail area is correct, the numbers are realistic.

The build is a combination of foam glass with plywood bulkheads and frames. The job is a classic 1986 build. Looks very good on the surface but open lockers etc that are not normally seen, some rough finishes appear.

An interesting fast cruiser. The jpegs give the idea.

 

[oldmulti]

An update on the Pinta Exception 53 (previous item) just found. The build yard was Chantier Pinta yard in La Rochelle. The actual sail areas are: Mainsail 840 square foot, a “staysail” of 350 square foot, a roller furling 860 square foot genoa, a Code 0 and a 1,940 square foot spinnaker. This gives 1900 square foot of sail upwind and 2,780 square foot of sail downwind.

The maximum draft is 8.1 foot over the central daggerboard. Yes, this was as the French would say “a very sportive trimaran”.

I will return to posting items in a few days, my partner has some medical issues.

 

[oldmulti]

Porsche does cars, Audi does cars but both also do have sidelines of lending their names and some design talents to boats. The Audi Trimaran is a graduation project by designer Stefanie Behringer (Pforzheim Technical College, Germany) for the Audi concept design studio in Munich, based on the idea of integrating two jet skis in a motorboat. There are no plans to put the Trimaran into series production, but it is an eye-catching project.

The following is a 15 meter (49 foot) trimaran that has 4 motors. Well not quite but it can run on 2 jet skis (one in each float aft) at about 8 knots for good manoeuvrability and low wake when running in bays or rivers. But living up to the Audi name the power tri can run up to 30 knots when using its 2 inboard diesel engines in the main hull. The power tri also has accommodation for cruising aboard as you require for EG coastal trips.

The Audi power tri is 49.2 x 18.2 foot. The main hull length to beam is about 6 to 1. The draft is 2 foot. The displacement and main hull engine power is unknown beyond the engines are Audi TDI diesels from Audi cars. The Personal water craft are powered by electric engines and batteries.

The accommodation is 2 double berth cabins with a galley and seating table between with a toilet shower area. The main saloon seating area can be converted to a narrow double berth. The real joy is the covered helming seating area above the aft double berth which is part of the cockpit. Protection whilst under way as well as a great spot to sit at anchor.

No production but a reasonable design study. Jpegs give the idea.

 

[oldmulti]

This is an interesting item from the Farrier boys. It explains a lot about how hard manufacturing of Multihulls is. EG keeping the designer happy, the need for new models when the second hand market for an original production design get started etc. Also when the designer updates to a racer model there is still a demand for an older style of boat but with the better shaped hull lines etc. The author is Ira Heller from The Multihull Source:

When John Walton sold Corsair Marine to Paul Koch in 1994, Corsair had three products: F-27, F-24, and the F-31. One of the first things that Koch did was to bring Ian Farrier back into the Corsair fold. [Walton and Farrier had a falling out in 1991 over the design of the 24.] The 24 was restored to Farrier's original design and relaunched as the 24 Mk-II. The original 31s construction had been subcontracted out to OSTAC in Brisbane, Queensland, AU (which was Koch's company) was moved to the factory in Chula Vista, CA. At the same time that Farrier was restoring the 24 to his original concept he was also updating the 31. Both boats were relaunched as 1995 models. Meanwhile, what was going on with the F-27? It has been in production since 1987, was now up to nearly 450 units sold and the design had not had any changes since 1991. A predictable thing happened, used F-27s began to appear in the marketplace and new F-27 sales nose dived. At one point, Corsair was completing two 27s a week. 1995 and 1996 saw combined sales of maybe ten boats. Farrier agreed to update the F-27. A rotating mast (carbon for racers, aluminum for cruisers) replaced the fixed aluminum mast, the cockpit was enlarged by doing away with the aft cabin, the controversial "swim step" was incorporated as part of the main hull, and the forward area around the daggerboard trunk and v-berth were re-designed. The deck, floats and main hull design (except for the transom) remained the same as the F-27 and it could have simply been called the F-27 MK-II but instead it was relaunched as the F-28R (carbon mast) and F-28AC (aluminum mast). After the initial showing by The Multihull Source, Windcraft and The Finish Line at the 1997 Corsair Nationals in Pensacola Beach, FL, sales immediately took off. But the F-28 was no longer seen as a cruisers boat since it didn't have two separate double berths or a privacy for the toilet. Sensing a demand for a cruisier version, Corsair launched the 28CC in 2000. It re-introduced the aft cabin (center cockpit), moved the outboard from a well (that intruded into the aft cabin) to the transom, raised the cabin by 3-1/2" and created an enclosed head compartment (affectionately referred to as "the coffin"). The vast majority of 28CCs were sold with an aluminum mast though there are a few examples out there with a carbon mast. When Corsair moved operations to Ho Chi Minh City, Vietnam, the 28 was rebranded into three versions: 28R (aft cockpit but with an aluminum mast which actually is quite nice and is the same aluminum section that was used on the 750s and now the 760s); 28CC (center cockpit with the enclosed head) and 28EC (E for economy, center cockpit but no enclosed head, toilet location under a cushion next to the daggerboard trunk).

 

[oldmulti]

The new Fountaine Pajot 41 cruising cat designed by Berret Racoupeau Yacht design is due for release now. It is a significant update on the previous Fountaine Pajot Lipari 41 with more space, better hull shapes and an improved rig but it also is 6,600 lbs heavier than the previous model. This is a big internal volume cruising catamaran that can sail, not a high performance cruiser racer.

The 41 is 39.7 x 22.7 foot with an unloaded weight of 28,450 lbs. Mast head is 68.5 foot above water with a 700 square foot mainsail, a 376 square foot genoa and EG optional 1,000 square foot spinnakers. The length to beam on the hulls is about 8 to 1. The draft is 4.4 foot over the fixed keels. The standard power is 2 x 20 cv diesels with 2 x 40 cv diesels as optional power.

The accommodation is what this design is about. The new 41 is available in a “maestro” owner’s version: the port hull becomes a genuine suite. The “Quatuor” version offers 4 cabins and 2 to 4 bathrooms. In all the cabins, you can enjoy sea views through the large windows and very wide beds thanks to the chines in the hull. The main saloon has a large galley, seating and a table but the glass door connected partially covered cockpit has a large external table and seating for dinner parties etc. The double helm and manoeuvring station that’s already proved itself across all Fountaine Pajot catamarans is now an integral part of the deck layout. Positioned at mid-height, it offers a perfect view of the water and the sails. It allows you to maintain contact with the crew in the cockpit, as well as those on the sundeck. A forward lounging area with an optional awning for quiet time.

There is a larger solar array on the cabin top and in the bows where trampolines are normal. The solar panels feed a large battery bank that will run all onboard functions, including air conditions for more than 12 hours. Optional hybrid diesel electric propulsion. Optional all-electric or all hydrogen propulsion.

Performance is unknown but this is an 8 knot average sort of cat with peaks of maybe 15 knots under good conditions.

The structure would be cored sandwich e-glass in vinylester with some carbon fire in strength areas.

The jpegs give the idea of a good cruiser design.

 

[tane]

12,8 f..ing metric tons for 12m catamaran...! & hideous to boot...
(what has the world come to?)

 

[oldmulti]

Scimitar J was designed by Shawn Arbor an Australian boat builder and designer. Shawn has produced many and varied designed which all are well designed, generally light and strong and perform very well. He favours plywood or foam glass or strip plank cedar with plywood bulkheads. This 33 foot design is a fast cruiser with the current owner has enjoyed the last 12+ years sailing and exploring Moreton Bay and competing in the WAGS (Wednesday afternoon social racing). This is a little sister to the 38 foot "The Boss" "Shazam" and "Wind Cheater". All very fast cruiser racers.

Scimitar J is 33 x 21 foot with a 10,080 lbs displacement. The 42 foot fixed mast is about 580 square foot of sail. Shawn likes about 12 to 1 length to beam on most of his cats with bell bottom hull shapes. The draft is 1.4 foot over the hull, 2.5 foot over the kickup rudders and 6.6 foot over the hull based dagger boards. The engine is a 29 hp Yanmar 3YM30AE centrally mounted with drop down Sonic mk2 leg with a fixed 3 blade props 16"d x 15"P. The fuel consumption is 1.8 lph at 2100 rpm at 6knots with a maximum speed of 7.5 knots. Electrics has a 400 Amp Hour house batteries with 240W of solar panels.

The accommodation has a small aft cabin to starboard, 2 large double berth cabins forward of the main beam and a head aft in the port hull. There is a galley in the hull. The main saloon has a seating and a table. The headroom in the main saloon is 4.5 foot but 6 foot in the hulls. The cockpit is large and secure. The entrance doors from the cockpit are positioned to allow easy access to hulls.

The build is foam glass sandwich with plywood bulkheads was done by a “home builder” but to a quality that Shawn would approve. Shawn originally used polyester resins then moved to vinylester. He used some “tricks” which provided excellent taping of polyester resin to plywood bulkheads. Also the plywood bulkheads are well thought out, EG the rear beam on a 34 foot Arbor cat had 4.8 mm ply webs with timber top and bottom flanges and support infrastructure. Light effective and fast to build.

The jpegs give the idea of a good fast cruiser.

 

[tane]

see, good accomodation AND sleek look - no contradiction!!!
Berret-Racoupeau & Fountaine Pajot: go, take lessons with Shawn Arber!

 

[peterbike]

see, good accomodation AND sleek look - no contradiction!!!
Berret-Racoupeau & Fountaine Pajot: go, take lessons with Shawn Arber!

Ah. but Tane, there are NO stone bench tops in an Arber.....

 

[tane]

Ah. but Tane, there are NO stone bench tops in an Arber.....

I wonder if the FP has them...
(& 1 stone bench top would probably weigh <10kg - still a far <cry to the FP "fatty")