farrier 18 trimaran

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Trailertri 18

Trailertri 18 is a 18 ′ 6 ″ / 5.6 m trimaran sailboat designed by Ian Farrier and built by Plans sold by designer starting in 1974.

Rig and Sails

Auxilary power, accomodations, calculations.

The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.

Classic hull speed formula:

Hull Speed = 1.34 x √LWL

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL

Sail Area / Displacement Ratio

A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.

SA/D = SA ÷ (D ÷ 64) 2/3

• SA : Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
• D : Displacement in pounds.

Ballast / Displacement Ratio

A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.

Ballast / Displacement * 100

Displacement / Length Ratio

A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

• D: Displacement of the boat in pounds.
• LWL: Waterline length in feet

Comfort Ratio

This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam 1.33 )

• D: Displacement of the boat in pounds
• LOA: Length overall in feet
• Beam: Width of boat at the widest point in feet

Capsize Screening Formula

This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.

CSV = Beam ÷ ³√(D / 64)

Beam folded: 7.83’/ 2.39m

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Farrier International

a Division of Daedalus

The F-32 is a plan version of the F-33, the availability of which has unfortunately been restricted due to unfavorable currency exchange rates, and a limited production capability, making it just too expensive for most markets. However, the F-32 helps overcome this by providing a close alternative that can be built anywhere by anyone.

The F-32 is available in several forms, the F-32A, F-32AX, or F-32R and F-32RX, with both aft cabin and aft cockpit versions, and all can be built by home or professional builders.

The F-32 is a modern ‘state of the art’ design, with most of the F-33 features such as larger floats, new beam to main hull connection system, improved higher set beams and folding system, retractable bow pole, carbon chainplates, synthetic rigging, daggerboard rudder, carbon fiber traveler, higher cockpit (more room underneath), improved sliding hatch, and shorter beams for lower trailering height.

Beams and folding system come with a completely new and simplified hull mounting system that is virtually identical to the F-33, with no annoying hull notches, and virtually no interior intrusion. It does not have the F-33 carbon fiber folding system anchors in the hull, as these are a little tricky for amateur builders. However, they are incorporated in the ready made F-32 beams.

The F-32 has one major advantage over the F-33 – there is a narrow 2.5m (8′ 2 1/2″) version (F-32A), which is the largest legally trailerable trimaran (without permit) in the world. The F-32AX version is the wider (permit required) version, and very similar to the F-33, with its additional interior room, plus there is an R version of both.

Like the F-33, the F-32 has been designed with an ocean going capability in mind, for those intrepid sailors who cannot resist going offshore in what may intended to be a trailerable yacht for bay and coastal sailing, such as the F-9. If one can’t stop such sailors from ocean crossing, then one may as well make the boat as safe as possible, with all the necessary structural and safety features for extended offshore sailing designed in.

F-32AX Aft Cockpit Interior – the one with Xtra room

F-32A Aft Cockpit Interior – the one trailerable without a permit

Interior can be varied considerably to suit owner/builder’s preferences. The layouts shown are intended as general guides only, and can be mixed and matched as required, provided designated structural bulkheads remain as designed. Full size patterns for all internal bulkheads and most interior panels are included in plans along with optional DXF files for having all these items machine cut.

F-32AX Aft Cabin Interior with aft double bunk

F-32A Aft Cabin Interior – with traditional layout

Centerboard Option

F-32ax aft cabin version shown.

A ‘kick back’ centerboard option has now been added to the F-32 design series. This will give a ‘roomier feel’ to the main cabin, and a much larger cabin table (can easily seat 6) is now possible. The settee seatbacks can also be dropped in between settees to form a very spacious main cabin double.

The other major advantage is the ability for the board to ‘kick back’ should one run aground, and this can be a very useful safety feature in shallower waters. Board is a higher aspect foil, and little deeper than the standard daggerboard, so it will be slightly more effective. This will make up for the extra slot drag associated with a centerboard case, and overall performance should be about the same.

Centerboard is now an option for both F-32A and F-32AX (F-32AX shown), with full construction drawings currently in process, and these will be ready by the end of July.

Note that ‘kick up’ centerboards are more complicated than a daggerboard, so will take longer to build, and the extra complexity may also mean more maintenance being required. However, having used such offset centerboards for all the original Trailertri designs, and the F-82, F-36 and F-39, the configuration used has been very well developed and tested. Follow the plans and it should be virtually trouble free.

F-32AX interior and room are very similar to F-33, as shown in following photos:

The F-32 cost to build is similar or just slightly more than the F-9 series. Though a little larger, the F-32 structure is more efficient in many areas.

The F-32 beams , new and unique “Beam Mounts “ (for mounting the beams and folding system into main hull), and the folding system are all available ready made to maximize ease and speed of construction. Plans for self made beams (though not as advanced as the ready made version) are included in the plans which will cut cost of ready made items required to less than $4000.

Particular care has also been taken to eliminate or reduce spray at high speeds, as with the F-33. Beams and folding struts are higher and further away from wave tops, and have been designed to trap and deflect any spray downwards.

Trailering beam varies depending on the float and beam configuration. The narrowest trailering beam (2.5m – 8′ 2 1/2″) for the F-32A will require self made beams.

Many F-33 parts are interchangeable, such as rudder, daggerboard, daggerboard case etc., but not the beams or folding system. The F-32 has the ability to fold down to a legally trailerable (without permit) beam, and the F-33 beams are not configured for this.

F-32R – Short Cabin Version

Cabin can be lower and shorter again if wished

F-32AX Deck Layout

F-32 Aft Cockpit Version

Models Defined:

F-32A – the standard version, legally trailerable without permit, the ‘A’ signifying Amateur builder

F-32AX – a wider, roomier version, that will require a permit for trailering, the ‘X’ standing for extra room. The best choice for ocean work with a greater load carrying capacity, and a wider overall beam.

F-32R & F-32RX – racing versions for experienced sailors, with a taller rig, the ‘R’ standing for Race.

Each set of plans cover all options, including details on aft cabin and aft cockpit versions, and all ‘R’ features, the only choice required initially being between ‘A’ and ‘AX’ models, which have different Full Size Patterns.

List of F-32 Plan Contents

Thanks again for the great plans – they are one of the best plans I have seen and that is including the AC (America’s Cup) plans or Volvo 60 plans, all boats I have worked on at different times. Chris Boucher, F-32AX, Auckland, New Zealand

F-32 Specifications L.O.A………………………………. 32′ 3″ (9.83m) B.O.A………………………………. 23′ (7.0m) …. F-32AX – 23′ 8″ (7.2m) L.W.L………………………………. 31′ (9.45m) F-32 Folded beam………………. 8′ 2 1/2″ – 8′ 6″ (2.5 – 2.6m) – depends on beams used F-32AX Folded beam…………. 9′ 6″ – 9′ 8″ (2.9 – 2.95m) Approx. bare weight …………… 2800 – 3700lbs (1270 – 1680kg) depending on model Load Carrying Capacity ……… 2600lbs to 3000lbs (1180 – 1360kg) depending on model & weight F-32 rotating mast ……………….43.3′ (13.2m) aluminum or carbon mast F-32 sail area (main & jib)…… 638sq.ft (59.2sq.m.) F-32R rotating mast …………….46′ (14m) – carbon mast F-32R sail area……………………682sq.ft (63.3sq.m.) Stability …………………………….56,000ft.lbs …. F-32AX – 57,500ft.lbs Draft (board up)…………………. 1′ 5″ (0.42m) Draft (d/board down)………….. 5′ 10″ (1.78m) Draft (centerboard down)…….. 6′ 2″ (1.88m) Aft Cabin Cockpit length………4′ 10″ (1.46m) Aft Cockpit length……………….7′ 7″ (2.3m) Interior Headroom ……………….6′ 2 to 6′ 4″ (1.88 – 1.93m) depending on interior layout Auxiliary…………………………… Outboard or Inboard optional All bunks can be a minimum of 6′ 6″ (2m) long or longer if required.

More Photos:

Published on December 11th, 2017 | by Editor

Eight Bells: Ian Farrier

Published on December 11th, 2017 by Editor -->

Ian Farrier

Ian Farrier, a visionary multihull designer best known for his folding trailerable trimarans, died at age 70 on December 10, 2017.

Ian Farrier first started sailing multihulls virtually by accident, being a twenty year old New Zealand engineering student and monohull sailor, looking for a keelboat to do some offshore cruising.

Nothing suitable was available, but then an unfinished 30-foot trimaran was advertised, and this was purchased after some research. After two years of hard work and rebuilding, his first multihull was launched in 1969.

It was not a perfect multihull, but it was reasonably fast and forgiving. However, some design limitations were apparent, and confidence was lacking for a long ocean voyage, so he jumped ship to a 38-foot keelboat bound for Tonga. The contrast in comfort, handling and safety aspects observed during this trip convinced him that a well-designed multihull was the way to go.

In 1972 he arrived in Brisbane, Australia, where the growing popularity of the monohull trailer sailer was noted while crewing on a local trimaran. A trailerable trimaran appeared to have many advantages over trailerable monohulls, so he decided to look at what could be done.

The Farrier Folding System™ was then invented, patented, and the prototype Trailertri 18 was built and launched in 1974. It worked beautifully and he then built five more Trailertris of various sizes, while trying out many different configurations.

In 1984 Ian and his family moved to Chula Vista (San Diego), where financial backing had been found to set up Corsair Marine. He then designed the F-27, built the prototype, and developed and established Corsair’s full production system and quality controls.

Almost immediately, this new design was a huge success. The sailing public loved the versatility of this new trimaran with its patented folding mechanism which allowed it to easily folded to a width that enabled it to be trailered behind a family car or fit a regular marina berth. Once extended to its full width for sailing, this new design proved itself as an awesome performance sailboat.

Farrier resigned from Corsair in 1991 and moved to Bellevue, WA to concentrate on new designs which Corsair was licensed to build. Farrier ended all relationship with Corsair in December 2000, working on his own as Farrier Marine to concentrate on his own projects.

Tags: Eight Bells , Ian Farrier

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Farrier F-18

Discussion in ' Multihulls ' started by Rick Emmet , Dec 16, 2008 .

Rick Emmet Rick Emmet

Hello everyone, I've been reading comments from all of you for some time; I really enjoy all of your insights and getting your perspective on boats and boat design. I have a simple question; I bought an F-18 the main hull of which was strip planked instead of being made out of plywood. The guy that built the boat lofted the lines himself based on the F-24. I think he built the main hull a little larger than it would have been if it were built out of plywood. Does anyone happen to have plans for an F-18? I've included a jpg of the main hull if that helps. Thanks much, Rick  

Attached Files:

jamez Senior Member

Hi Rick, That hull looks really nice. Ian Farrier has released plans for the 680/720, through one of the australian multihull clubs - the intention being to help people restoring old versions. They aren't licensed for new builds. However much of the info may be applicable to the 18. I'd want a bit more float volume myself. Other option, talk to ray Kendrick (Team Scarab) who has designed a folding 18 with bigger floats than the early Farriers. He may be able to help with float / crossbeam specs etc.  

Hey Jamez, That is awesome to know! Thanks so much for the info (I could have used plans when I was restoring the boat). FYI the floats on my F-18 were enlarged (don't know how much) and I have had the boat out in winds of approximately 25 mph with all the working sails up. This boat is very stable with larger floats. You may want to consider building new crossbeams and floats out of foam core to lighten up the boat. That would take about 150 lbs off my boat. Thanks again, Rick  

Rays designs are for ply or foam flat-panel construstion. I reckon the 18's floats would be a great addition to a TT18. Heres a couple of links http://www.foldingtrimaran.blogspot.com/ http://teamscarab.blogspot.com/ I did look at a TT18 a few years ago, but was already halfway through rebuilding my 7 metre Wharram cat - so let it go. My current ride http://uk.youtube.com/watch?v=E2YYOzfAfNA  

Thank you Jamez, I going online to look at the sites now. Cheers, Rick  

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Hey Jamez, Like your cat! If I put video up on Youtube of my F-18 sailing in San Diego, you'd laugh, we get almost no wind here. Looks like you're having a great time sailing. Hasta la vista, Rick  

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