farrier trimaran f9

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• Sailboat Guide

F-9A is a 30 ′ 10 ″ / 9.4 m trimaran sailboat designed by Ian Farrier and built by various starting in 1991.

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)

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• About Sailboat Guide

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Farrier International

a Division of Daedalus

The New F-33

The 2015 F-33 is a new design by Ian Farrier, having evolved from the F-32 , and replaces the original 2004 F-33 . It is available in several formats, the F-33 , F-33X (with wider center hull), or the more race orientated F-33R and F-33RX, plus all carbon versions, the F-33RC and F-33RXC . Both aft cabin and aft cockpit versions are also currently available.

The new F-33 is a truly modern ‘state of the art’ design, and incorporates the latest third generation Farrier Folding System ™. The third generation beams have no intrusion into the main cabin, and eliminate the awkward beam pockets in the cabin sides. Floats are as large as they can be for such a folding trimaran, with extra buoyancy having been designed in forward and low down for the maximum sail carrying power.

The standard F-33 offers more room than any other equivalent legally trailerable folding trimaran, due to efficient design, plus heavy and space robbing interior liners are not used , which also makes the F-33 the lightest available production boat of its type. The extra wide maxi F-33X is even larger again, and is easily the roomiest and most seaworthy folding trimaran in its class.

The new F-33 series has one major advantage over the original F-33, this being the availability of the narrower 2.6m (8′ 6″) F-33 version which is the largest legally trailerable trimaran available, with no permit required for US roads. The wider F-33X will require a permit to be trailered, but it has much more room and a higher load carrying capacity.

The new F-33 series has been designed with a limited ocean going capability in mind, and best of all they are true Farrier designs, so reliability is ensured.

A ‘kick back’ centerboard option is available for the new F-33 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 than the standard daggerboard, so it will be slightly more effective. This will help make up for the extra slot drag associated with a centerboard case, and overall performance should be similar.

Note that ‘kick up’ centerboards are more complicated than a daggerboard, so more maintenance may be required. However, the configuration used has been very well developed and tested, and should be virtually trouble free.

The current F-33X interior quality and room can be seen in the following photos:

THIRD GENERATION FARRIER BEAMS AND FOLDING SYSTEM:

The latest F-33 beams have been designed to trap and deflect any spray downwards to eliminate or reduce spray at high speeds, while the beam folding strut anchors are internal which eliminates multiple metal brackets and bolts. This reduces windage, weight and complexity, while folding struts are now set higher, keeping them further away from wave tops. The above drawing also clearly shows the difference between the F-33 and F-33X .

Beams are more streamlined while also being slimmer and higher at outer ends for less drag. The inner beam end to main hull connections are now fully external, for easier setup and maintenance, and this also gives a lower trailering height with less windage on the road for more economical towing.

Models Defined:

F-33 – the standard version, legally trailerable in the USA without permit

F-33X – a wider, roomier maxi 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-33R & F-33RX – more sporty racing versions for experienced sailors, with a taller rig, the ‘R’ standing for Race. Add ‘C’ at end for the all carbon version

F-33SR & F-33SRX – new highly powered super racing versions for experienced sailors only, with the very tall SR rig, the ‘SR’ standing for Super Race. Has a 50′ (15.24m) carbon mast, and all carbon construction is optional. Profile drawing below.

F-33 Specifications L.O.A………………………………. 33′ (10.06m) B.O.A………………………………. 23′ 2″ (7.05m) …. F-33X – 23′ 10″ (7.25m) L.W.L………………………………. 32′ 4″ (9.85m) F-33 Folded beam………………. 8′ 6″ (2.58m) F-33X Folded beam……………. 9′ 6″ (2.9m) Approx. bare weight …………… 2800 – 3700lbs (1270 – 1680kg) depending on model Load Carrying Capacity ……… 2600lbs to 3000lbs (1180 – 1360kg) depending on model & weight F-33 rotating mast ……………….44′ 7″ (13.6m) aluminum or carbon mast F-33 sail area (main & jib)…… 654sq.ft (60.5sq.m.) F-33R rotating mast …………….47′ 3″ (14.4m) – carbon mast F-33R sail area……………………702sq.ft (64.9sq.m.) Stability …………………………….56,900ft.lbs …. F-33X – 58,400ft.lbs Draft (board up)…………………. 1′ 5″ (0.42m) Draft (d/board down)………….. 6′ 4″ (1.93m) 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 Bunks can be a minimum of 6′ 6″ (2m) long or longer if required. All specifications may be subject to change

As with the original F-33, the new F-33 is expected to have a very high resale value, due to the high quality construction, and the design reputation. The last original F-33 sold did so within 10 days of going on the market, and the price paid for what was a 7 year old boat was near what it cost new. Such value means the F-33 will be a very low cost boat to own as was the case with the original F-27, which has been the resale value leader for many years.

The New F-33SR

A new addition to the F-33 range is the F-33SR or F-33SRX. These are ultra high performance versions of the F-33 and will replace the F-32SR, but with more interior room.

There will be both glass and carbon options, the all carbon version being called the F-33SRC or F-33SRXC, and lifting foils will be optional.

More Interior Options:

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