Downloadable Drawings (PDF files):

Layout Drawings

Typical Deck Layout

F-82 Interior with daggerboard

F-82 Interior with centerboard

F-82 Aft Cabin Interior with centerboard

F-9A Aft Cabin Interior

F-9AX Aft Cockpit Interior

F-9AX Aft Cabin Interior

F-36 Aft Cabin Interior

F-36 Aft Cockpit Interior

Trevor Wuorti's F-9A center hull port side half, cabin top to the right

Main hull half removed from Form Frames - Jan Kloub's F-9R in Maine. Note how
few glue joins are needed in a vertically stripped hull. Less weight, much less work

Samples From Construction Drawings

Strongback Setup (F-82)

Frame Setup (F-9)

Float Construction (F-82)

Hull Construction (F-36)

Main Hull Construction (F-82)

Ian Keal's F-9AX port hull half complete and ready for joining

Main Hull Construction (F-9)

Main Hull Join (F-36)

Main Hull Construction (F-82 cockpit)

Glenn Harris's F-82 interior under construction - with daggerboard case

Builder/Owner Web Page Links:

Building an F-82R - An Article by Glenn Harris

Building an F-82R - a blog by Martin Friderichsen

Building an F-39 - Henny van Oortmarssen's web site

Hank Brook's F-31 Web Page - many detailed photos of an F-31 (same design as F-9A)

Cruising In Europe Niels Tempel's web site on sailing his F-82R Trojka

A Note Of Caution On Building Methods: There are now quite a few builder's websites available on the internet, and some very advanced methods (infusion, vacuum bagging etc.) and materials are being used. However, it should be noted that such methods or materials are not necessary, nor are they specified. Plain old hand laminated fiberglass still works fine, and that is how I would build my own 'one off' hulls. Infusion and vacuum bagging can greatly improve the final result, but frequently one is only talking about a few kilos saved for what can be considerable extra work. Flat panel bulkheads are the only thing that I would vacuum bag, but, again, this is not necessary. However, once vacuum bagging is tried and experienced, it can be hard not to want to vacuum bag everything, as it does work so well.

The option is there for some very advanced and sophisticated work, if wished, but always be aware that the extra expense and time necessary is probably not worth it for most.

The hulls should be quick and easy to build - don't make it more complicated than its needs to be. Hulls are actually only a small part of construction, with most time going into internal finishing, assembly and fitting out. Spend too much time on the hulls and the boat may never get finished.

An F-9A in Holland

Dear Ian,

We launched our boat, 'Milonga' F-9R 195) last July in Croatie (meditteranean sea) and have been sailing since then. See our website (not yet completely finished)

Thanks for your perfect plans,

Chiel and Marianne

F-82R nearing completion in Canada:

Larry Woods F-82R Aft Cabin with F-33 style all carbon fiber traveler horse

Larry's F-82R Aft Cabin swim step area

and F-33 style wing net attachments


This patented system greatly simplified the installation of the beams and Farrier Folding System™. It allowed the use of more modern building materials and saved considerable time by avoiding having to fit and construct the folding system in place, piece by piece.

Being lighter, roomier, easier to build, and requiring less materials, the F-Series trimaran designs have been an even better investment of time, with their resale value being two to three times that of the older Trailertri series designs.

Procedure: Once hull and deck halves have been joined, the necessary openings are cut in the deck and hull sides for the Central Mounting Modules (later models now use smaller and ready made 'Beam Mounts'). Modules are fitted in their respective fore and aft positions, leveled and centered. They are then just glass taped into position.

At final assembly, beams are moved into position and connected to both Upper and Lower Folding Struts. These and the Central Mounting Modules will automatically align the beams. Floats are now positioned by the beams, and glass taped in place.

More F-9A interior photos:

F-9A looking forward

F-9AX looking forward

An F-9AX built in the Czech Republic

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