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Trailertri 680
Designer: Ian Farrier  ·  Builder: Plans Or Sold As Kits  ·  First built: 1978
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About the Trailertri 680

Designed with portability and accessibility in mind, the Trailertri 680 is a trailerable trimaran that appeals to sailors who want the performance advantages of a multihull without the limitations of a marina-dependent lifestyle. As the name suggests, this boat is built to be launched, sailed, and retrieved with relative ease, making it an attractive option for those who prefer to explore different sailing grounds rather than keeping a vessel in a single berth. Trailerable trimarans like the 680 are generally well-suited to coastal and inland sailing, offering the stability and speed characteristic of multihull designs while remaining compact enough for road transport. The wide beam typical of trimaran configurations provides a confident, upright sailing platform that many sailors find reassuring, particularly in variable conditions. Day sailing and weekend cruising are natural fits for a boat of this type, though spirited performance is usually part of the package. With limited specifications publicly available, prospective buyers are encouraged to connect with current owners or class associations to gather firsthand insights into the boat's handling, rigging, and trailering setup before making a purchasing decision.

Core Dimensions
LOA (Length Overall) 22.31 ft / 6.80 m
LWL (Waterline Length) 20.44 ft / 6.23 m
Beam 16.34 ft / 4.98 m
Max Draft 4.27 ft / 1.30 m
Displacement 2,513.00 lb / 1,140 kg
Design & Construction
Hull Type Trimaran Cbrd.
Rigging Type Fractional Sloop
Construction Plywood
Designer Ian Farrier
Builder Plans or sold as kits
First Built 1978
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Known Issues & What to Watch For

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Performance Ratios
Displacement/Length Displacement to Length ratio measures how heavy a boat is relative to its waterline length. Lower values mean a lighter, faster boat.
Under 100 — Ultralight racer100–200 — Light cruiser/racer200–300 — Moderate cruiser300–400 — Heavy cruiserOver 400 — Very heavy
131.37
Comfort Ratio Ted Brewer's Comfort Ratio predicts how comfortable a boat will feel in offshore conditions. Higher values mean a steadier, more comfortable motion in a seaway.
Under 20 — Uncomfortably rough20–30 — Acceptable coastal30–40 — Good offshore comfortOver 40 — Very comfortable offshore
4.44
Capsize Screening Formula The USHS Capsize Screening Formula estimates offshore capsize risk. Lower is safer — values under 2.0 are considered acceptable for offshore sailing.
Under 2.0 — Safe for offshore2.0–2.2 — Borderline offshoreOver 2.2 — Coastal use recommended
4.81
Hull Speed Hull Speed is the theoretical maximum speed of a displacement hull, calculated from waterline length. Most cruising sailboats reach this speed in moderate conditions. 6.06 kn
Pounds/Inch Immersion Pounds per Inch Immersion (PPI) tells you how much weight is needed to sink the boat one inch. Useful for calculating how additional gear and stores affect waterline. 7.16 pounds/inch
Rig Dimensions
I (Foretriangle Height) 1.41 ft / 0.43 m
P (Mainsail Luff) 236.00 ft² / 21.93 m²
E (Mainsail Foot) 131.37
How It Compares

vs. J22, Spider 22, Thom Cat 23

This boat Similar boats
Dimensions
LOA
Trailertri 680 ★
22.3 ft
J22
22.5 ft
Spider 22
22.3 ft
Thom Cat 23
22.5 ft
LWL
Trailertri 680 ★
20.4 ft
J22
19.0 ft
Spider 22
20.5 ft
Thom Cat 23
21.3 ft
Beam
Trailertri 680 ★
16.3 ft
J22
8.0 ft
Spider 22
8.1 ft
Thom Cat 23
10.0 ft
Displacement
Trailertri 680 ★
2 lbs
J22
1 lbs
Spider 22
1 lbs
Thom Cat 23
6 lbs
Ballast
Trailertri 680 ★
J22
700 lbs
Spider 22
518 lbs
Thom Cat 23
Sail Area
Trailertri 680 ★
J22
223 sq ft
Spider 22
Thom Cat 23
435 sq ft
Performance
SA / Displacement (higher = more powerful)
Trailertri 680 ★
J22
24.3
Spider 22
Thom Cat 23
20.0
Ballast / Disp (higher = stiffer)
Trailertri 680 ★
J22
39.1 %
Spider 22
35.1 %
Thom Cat 23
Comfort Ratio (higher = more comfortable offshore)
Trailertri 680 ★
4.4
J22
8.6
Spider 22
Thom Cat 23
21.6
Capsize Screening (lower = safer)
Trailertri 680 ★
4.81
J22
2.64
Spider 22
Thom Cat 23
2.15
Displacement / Length (lower = lighter)
Trailertri 680 ★
131
J22
116
Spider 22
76
Thom Cat 23
Hull Speed
Trailertri 680 ★
6.1 kts
J22
5.8 kts
Spider 22
Thom Cat 23
6.2 kts
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