Formosa 51

Description

The Formosa 51, a full-keel, clipper-bowed ketch designed by William Garden and built by Formosa Boat Building Co. in Taiwan between 1973 and 1982, stands as the flagship of the Formosa line and one of the most iconic heavy-displacement blue water cruisers of the 1970s. With an LOA of 50'10", a 14'2" beam, 6'6" draft, and 40,000 lbs. displacement (including 15,000 lbs. of external lead ballast), the hull—laid up with 1¼-inch solid fiberglass below the waterline—offers tank-like strength and a seakindly motion that has carried dozens of owners on circumnavigations. The standard ketch rig (cutter-ketch option common) provides a low SA/D ratio of ~14, prioritizing balance and ease of handling over speed; most boats cruise at 6–7 knots under tradewind conditions with a Comfort Ratio exceeding 50. Below, the teak-soaked interior rivals a small apartment: a private aft owner’s stateroom with double berth and en-suite head, a walk-through galley to port, a raised saloon with 6'6" headroom, a forward guest cabin with V-berth, and a second head—easily sleeping six in comfort, though condensation and teak maintenance are perennial concerns. Roughly 120 hulls were produced, many exported via Bob Lane to U.S. West Coast buyers; today well-found examples trade between $70,000 and $130,000, with premiums for refit boats featuring updated chainplates, modern standing rigging, lithium banks, and watermakers.

Construction Details

Designer William Garden
Builder Formosa Boat Building Co.
Length 51.000 ft
LOA 40.920 ft
LWL 32.000 ft
Beam 12.170 ft
Displacement 28000 lb
Max Draft 6.160 ft
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The standard boat dimensions

i 54.70 ft
j 18.30 ft
p 48.30 ft
e 19 ft
p2 28.50 ft
e2 11.80 ft
i2 -
j2 -

Sails

Sail Type MAINSAIL
Luff * 48.3 ft - (14722 mm)
Foot * 19 ft - (5791 mm)
Leech * 51 ft - (15545 mm)
Tack Angle * 88 °
Diagonal * 51.28 ft - (15630 mm)
Head (inches) * 6 in - (152 mm)
Area * 469.16 ft²
Sail Type JIBSAIL
Luff * 46.14 ft - (14063 mm)
Foot * 24.42 ft - (7443 mm)
Leech * 39.77 ft - (12122 mm)
Percentage LP * 114.97 %
Length Perpendicular * 21.04 ft - (6413 mm)
Deck Angle * 12 °
Area * 485.44 ft²
Sail Type GENOA
Luff * 54.8 ft - (16703 mm)
Foot * 29.71 ft - (9056 mm)
Leech * 51.38 ft - (15661 mm)
Percentage LP * 150 %
Length Perpendicular * 27.45 ft - (8367 mm)
Deck Angle * 4 °
Area * 752.12 ft²
Sail Type ASYMMETRICAL
Luff * 54.8 ft - (16703 mm)
Foot * 30.2 ft - (9205 mm)
Leech * 50.42 ft - (15368 mm)
Perc LP * 165 %
Area * 1241 ft²
Sail Type YANKEE
Luff 51 ft - (15545 mm)
Foot 22 ft - (6706 mm)
Leech 39 ft - (11887 mm)
Percentage LP * 86.23 %
Length Perpendicular * 15.78 ft - (4810 mm)
Deck Angle * 25.69 °
Area * 402.29 ft²
Sail Type STAYSAIL
Luff 33 ft - (10058 mm)
Foot 15 ft - (4572 mm)
Leech 29 ft - (8839 mm)
Length Perpendicular * 13.18 ft - (4017 mm)
Area * 217.42 ft²

Disclaimer. Boats are not all the same -- even when produced in the same factory of the same model. Sailrite does its best to publish accurate dimensions, but we often find it worthwhile to have our customers measure their boats carefully before we produce kits for them. You should take the same precautions, especially when the data is not from Sailrite. The information on this site is not guaranteed to be accurate. Sailrite offers this content as a service to our community, but takes no responsibility for the reliability of the data provided.