The F-9A was used as the basis for the F-31 production trimaran, which was initially built in Australia in 1991 - see Launching Report reprint. The F-31 was then implemented at Corsair Marine in 1994.

Both the F-9 and F-31 are virtually identical, with the same hulls, beams, folding system, and rig. Many F-31 parts can still be used for the F-9A, but several areas of the F-9 series have been improved over the F-31 as currently built by Corsair Marine. These include larger and more efficient Mk II floats (430lbs more buoyancy), carbon fiber chainplates, and a daggerboard rudder option (as used on the F-32/F-33).

There are three versions as follows:

F-9A - a larger, more long term performance cruiser, yet still easily trailerable for great versatility.

F-9AX - has a 15% wider center hull for even more interior room

F-9R - a higher performance version of the F-9A with a taller rotating mast.

All models can be built with different cabin versions as follows:

Aft Cabin Version

The aft cabin version has ample room for 4 or 5 adults, with standing headroom in the galley area. Galley is large and can be customized to individual taste. A chart table can be located on the starboard side (with a fold down flap).

Cabin settees are 6' 3" (1.9m) long and these are also used for berths, with storage areas underneath. A cabin table will easily seat four, and can fold down or away when not in use.

The aft cabin has a double berth with full sitting headroom. Access is through a hatch in the aft cabin front, or through under the cockpit.

The forward cabin has a separate toilet area on the port side which can be curtained off, a vanity unit is to starboard, and a cozy (snug) double berth, or large single is in the bow.

Aft Cockpit Version

The aft cockpit version has a longer main cabin, for more interior space, while the larger cockpit extends to the transom. Major advantage is a separate 'walk in' head and shower area besides the daggerboard case, and a very large double berth in the bow.

Both cabin versions have a 2 1/2" (64mm) higher cabin roof option, for more standing headroom if required.

General

A daggerboard is used for simplicity, its case helping to support the mast. A kick-up spade rudder is housed in its own retractable rudder box in the transom.

A new transom hung rudder is recommended for either the aft cabin or aft cockpit versions, due to its lighter weight, simplicity and adjustability. If desired, the original F-9A underslung rudder still remains an option.

The fractional rig is very efficient and easy to handle in all conditions. Farrier designs do not need an oversize rig to perform well, and this coupled with the F-9A's enormous 47,000 foot-lbs righting moment results in a very safe cruising boat. Boom is roller furling.

An outboard of 8 to 15 HP is recommended on the stern with remote controls being located in the cockpit if needed.

F-9A™ Specifications

L.O.A.	30' 10" (9.4m)
L.W.L.	30' (9.15m)
B.O.A.	22' 5" (6.84m)
Folded Beam	8' 2 1/2" (2.5m)
Draft	1' 4" (0.41m)
D/board down	5' 6" (1.67m)
Empty weight	3000-4000lbs
(depends on materials/methods)	(1350-1800kg)
Mast Height Std.	40' (12.2m)
Sail Area (Main & jib)	599sq.ft. (55.4sq.m.)
Height on Trailer	11' 6" (3.5m)

F-9AX™

Same as the F-9A but with a 15% wider center hull for considerably more interior room, a 16% higher load capacity, and 8" (200mm) wider overall beam (23' 1" or 7.04m).

The trailering width is increased to 9' 6" (2.9m) but this can be easily trailered in most states, and many countries without major difficulty. Usually just a written permit. Has the same options as the F-9A.