farrier f25c trimaran

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• Sailboat Guide

F-25C is a 26 ′ 11 ″ / 8.2 m trimaran sailboat designed by Ian Farrier starting in 1995.

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)

Folds to a beam of 8.17’. Discontinued in favor of F-82R.

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• About Sailboat Guide

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Farrier International

a Division of Daedalus

About Farrier

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If thinking of buying or building any multihull then the designer’s background and experience is very important. Has he built or sailed any of his own designs? Do they actually have a race or sailing record to match the claims? Is the designer readily accessible and responsive?

If considering building yourself, are the plans fully detailed with photos, instructions, and easy to follow three dimensional views with step by step instructions? Do they include extensive Full Size Patterns, and a comprehensive materials list?

If considering a production multihull, is the manufacturer experienced, and do they respond to customer questions or concerns? Do they have skilled, knowledgeable staff, with good technical expertise and quality controls? Do they back their product, and, very importantly, who designed or engineered that product, and is that someone prepared to put their name on it ?

There is no university or school that teaches multihull design or construction, nor are there scantling rules, as exist for monohulls. The only teacher has been years of practical building and sailing experience. Only experience will tell the loadings and correct safety factors for the many critical areas of a multihull. A competent engineer may have the skills to design beams that will not break for a given load, but if he doesn’t know what that load is, or in what directions it can act, then even the best engineering skills are of little help.

There are a number of excellent multihull designers and builders, but choose carefully, as this is very important to the safety and security of your family, the ease and cost of construction, and the final resale value.

Multihulls are now one of the fastest growing segments of the sailboat market. They have circumnavigated the globe at record speeds, and are rapidly becoming the family cruising boat of choice as more is learned about their many other advantages. These include level sailing, unmatched stability, deck space, unsinkability, shallow draft, comfort, and just the sheer fun of sailing a fast and responsive cruising boat.

Farrier trimaran and catamaran designs combine all of these advantages, to be the perfect sport cruisers. They are a unique and practical combination of easily handled fun cruisers for families, and exciting performance for racers.

The unique Farrier Folding System™ also provides ‘take-it-anywhere’ trailerability, and the ability to use any marina dock. It has forever eliminated the old problem of what to do with a super wide trimaram

Farrier multihulls are now well proven, having evolved from over 30 years of constant development, hands on building, and sailing. With well over 3000 production and home built versions currently sailing world wide, performance and reliability has been demonstrated beyond doubt.

The basic design philosophy has always been to provide safe, roomy, well engineered multihull cruisers with performance provided by design efficiency and good engineering, not at the expense of accommodation, structure, or safety.

All designs are thus light to medium displacement multihulls, with conservative rigs, while scantlings and safety factors are on the rugged side, for strong, durable, and safe boats. They are also unsinkable, due to construction materials, and NO LEAD or other heavy metals being present.

The roomy interiors have been designed with the cruising sailor in mind, and with heel rarely exceeding 12 degrees, all facilities can be easily used while underway – stoves not even needing gimbals.

On deck, there’s a huge amount of deck space, and this combined with low heel angles make Farrier multihulls one of the safest boats afloat for children. The comfortable wing or bow nets make an ideal spot to relax and sunbathe while the water zips by below.

EASY TRAILERING

With no heavy keel needed, Farrier trimarans sit low on the trailer and are light and easy to tow. This will allow you to discover and explore many previously out of reach cruising grounds, or race in exotic venues far from home. Trailering offers significant savings in slip fees and maintenance that can even cover most of the ownership costs.

Rigging and launching can all be done single-handed in around 30 minutes or just 15 minutes with two – no difficult assembly or heavy lifting is required.

Launching is always done folded, using no more space than a conventional boat. Stability afloat is excellent and the floats are normally extended while motoring away.

Marina docking while folded is as easy as any other craft, and the minor problem with long term docking of growth on the folded float sides has now been eliminated by new ‘HydroHoist’ or dock liner systems. However, the high expense and maintenance involved with keeping a boat in the water can be avoided by the ease of trailering.

EASY AND FUN TO SAIL

Took my first sail last weekend in my new (used) 1990 F-27 “Serafin”. My crew consisted of my wife and 9 month old son. Needless to say I did not have a lot of help. Awesome boat!!! It sets up and launches easier than my Tornado cat, is nearly as quick and handles like a fast dingy and the family was dry and comfortable the whole time. Truly a magnificent craft, Ian has really covered all the bases. After 35 years of sailing I feel like a kid again!!! Steve, Kim, Zachary and Sandy Schulz, F-27 Serafin, S. California, USA

All Farrier multihulls are designed as easily handled, roomy and safe family cruisers, that are fun to sail. They also just happen to be fast, which comes as a no cost extra. It’s even possible to tow a waterskier under sail on some models!

Actually these boats sail back wards really well. We were on a charity race with a couple of mono cruisers, we would get ahead and turn back to meet them when my step son asked if the boat would sail backwards – so I pushed out the main, backwinded the genoa and had him steer and we passed the mono cruisers going backwards. Not much wind but it was fun Rod Tharp, F-9A and now building F-32AX, Olympia, WA, USA

The ‘ease of performance’ is most notable, this being the option to go fast effortlessly, while still maintaining comfort and a feeling of security for the crew. Cruising range is greatly increased making many previously out of reach anchorages a reality.

High averages can be effortlessly maintained, and this was well demonstrated by two F-27s averaging an incredible 17.9 and 18.2 knots for the 44 mile course in the 1993 Miami – Key Largo race, while blitzing the fleet. Not everyone wants to go this fast, but it is easier to slow a fast boat down, for ultra-safe effortless cruising, than trying to make a slow boat go fast.

Helm is always light and responsive at any speed, while tacking is dinghy-like. Even continuous 360 degree turns are possible with trimarans, helm hard over, without touching the sails.

The lack of sailing vices makes any Farrier multihull very suitable for shorthanded sailing with just one or two. There is never a need for a large crew just to keep things upright and under control. They are thus a great practical cruising boat for the family, perfect for the idyllic sail, with a visit to that distant secluded beach for lunch, and trailerables can be safely back on the trailer before nightfall, all with minimal effort.

FARRIER FOLDING SYSTEM™

One key to the success of Farrier trimarans is the easy trailerability made possible by the unique Farrier Folding System ™.

The Farrier system is the most structurally sound trimaran folding system available, with no hinges in the beams or the critical beam to float join, while corrosion prone wires are never used in structurally critical areas. Overall beam can be varied in seconds, by just one person, anywhere.

After 33 years of use world wide the Farrier System is well proven, the most successful folding system, and used by more trimarans than anything else. So to be safe, be sure to insist on the genuine twin strut ‘Farrier Folding System’™. It is significantly different from all the rest, and the many advantages can be summarized as follows:

• Folds for road legal trailering in minutes without any heavy assembly being required.
• The twin strut folding system gives absolute control over movement
• No need for water to support floats while folding – the twin struts make it easy to fold anywhere
• The correct folding strut geometry means folding can be done by one person, anywhere.
• Twin struts mean the float will not fall on the ground if folding out of the water on a trailer
• Absolutely no weak hinge points in the actual beams, with the highly stressed beam to float join being solid
• Absolutely no sliding parts that can bind or jam
• Corrosion prone wires are not used in structurally critical areas where sudden failure could threaten the boat
• The structurally critical lower struts are solid Aluminum 6061 T6 bar, with absolutely no butt welds.
• Custom made reinforced acetal (plastic) bushes insulate aluminum struts from stainless steel pivot pins
• There is no reliance on the rig for structural support should float reverse loading occur
• Beams are structurally sound no matter how loaded, including even after a capsize
• Proven track record, with 33 years development, six Atlantic crossings and race records/wins world wide.
• Now used by over 3000 boats world wide

Ian Farrier

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’ trimaran was advertised, and 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. It was also good enough to sail single-handed from his home town Christchurch to Auckland, surviving two mid-winter ‘roaring-forties’ storms on the way. However, some design limitations were apparent, and confidence was lacking for a long ocean voyage, so he jumped ship to a 38’ 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. Over this period the folding trailerable trimaran slowly began to establish itself as a practical and exciting option, to eventually become one of the fastest growing segments of sailing.

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. With 100 boats being produced every year, and an excellent reputation established, it was time to concentrate on new designs, so he resigned from Corsair in 1991, and moved to Bellevue (Seattle). Corsair was subsequently licensed to build the F-24, F-28 and F-31 designs, in a productive ongoing relationship, though rocky at times, with varying ownership/management at Corsair.

Ian ended all relationship with Corsair in December 2000, finding himself once again working on his own as Farrier Marine, Inc., and concentrating on new projects via other avenues. In 2017, he sold Farrier to Daedalus International.

Sadly, Ian Farrier passed away suddenly in early December 2017. He is survived by wife Alicia and sons Michael and Steven. The multihull world is reeling from Ian’s loss and we are grateful for the hundreds of kind messages of support we have received. The Farrier brand continues as Ian would have wanted in our Christchurch factory. A small team of F-Boat enthusiasts will work to ensure the F-Boat sails well into the future.

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• F-25C Cruising Trimaran

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• Farrier F-25C Cruising Trimaran

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Farrier F36/F39 Ravenswing – Trimaran Sailing

Building & sailing a farrier f36 trimaran, upgraded to farrier f39 specifications.

Preparing the F25C tri for paint

During the fall season, we kept at the detail work to prep the boat for a new paint job. Good quality boat paints are really expensive, upwards of $300/gallon. And the whole process is so laborious, it’s really worth doing it right the first time; you sure don’t want to have to repeat any of this because of unsatisfactory results. So this video will show how an extra couple of weeks beyond what i expected was necessary to get the good paint results we’ll look at next time. Sit through this one, and you’ll be rewarded with a better looking video next time. :)

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2 thoughts on “ preparing the f25c tri for paint ”.

Wow! Your attention to detail puts a lot of us to shame. Question: do you cover the boat at night to keep the dew off?

Hi Joe. No, it’s not feasible to tarp this thing so I had to work carefully with paint-steps timing. The unusually rainy October really messed with me! In general if I paint early in the day, and use accelerator in the mixed paint, it flashes solid enough to have the protective outer shell formed. One day I painted until 3pm and that was a mistake. Paint didn’t set up before the evening dew, and that coat went dull/matte overnight where the water settled on. The other issue is all hardware holes have been predrilled, so I went around and stuck little blobs of butyl tape in all the holes for temporary waterproofing while the boat awaits hardware / sailing gear installation.

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   FARRIER F- 25C  "Flow" # 76220   Bwjr./Launched:  1995 / 2019                              

EVECOM MULTIHULLS vind ik leuk

 >>  Foto’s interieur / interior photos                            >> detail foto’s / detail- pictures

>> Beschrijving / Description                   >> Farrier F- 25C introduction 1995                   >> Multihull index

  (22- 1- 2022)

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EVECOM MULTIHULLS  -   Post: Fabrykswei 11 -   NL- 9216 WR  Oudega (Sm.) -  Tel. (+31) (0)512 371999  -     KvK Noord.: 73078376

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