Cheoy Lee Offshore 50 Ketch (Alden 50)

Cheoy Lee Offshore 50 Ketch (Alden 50)

Description

The Cheoy Lee Offshore 50 Ketch (also known as the Offshore 50 or Alden 50) is a classic large bluewater cruising sailboat built by Cheoy Lee Shipyard Ltd. in Hong Kong starting in 1966 (with production in the late 1960s to early 1970s; examples commonly dated around 1966–1970s). It was designed by Alden & Associates (John G. Alden, the renowned American naval architect known for elegant, seaworthy offshore designs); production numbers were very limited at 12 hulls (per sailboatdata.com; some owner/Alden sources suggest up to 17 including variants like aft/center cockpit layouts). Special features include its long/full keel for superb directional stability, tracking, and protected rudder in heavy seas; heavy-duty fiberglass construction (solid GRP hull and deck, with teak trim, laid teak decks, and original Sitka spruce spars—aluminum optional); masthead ketch rig for balanced, short-handed manageability (easy to reef and sail under reduced canvas); spacious accommodations (often midship or aft cockpit with generous interior volume, tankage, and storage for liveaboard/offshore use); and a reputation as a sturdy, comfortable heavy cruiser with excellent motion in waves, proven offshore capability (transatlantic passages noted), and timeless classic lines—ideal for long-distance bluewater cruising, though as 50+ year-old vessels, teak maintenance, rigging updates, and potential early GRP concerns are key.

Construction Details

Designer John G. Alden
Builder Cheoy Lee
Length 50.330 ft
LOA 50.330 ft
LWL 34.670 ft
Beam 13.170 ft
Displacement 34000 lb
Ballast 13000 lb
Max Draft 6.500 ft
Year Built 1966
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The standard boat dimensions

i 52.66 ft
j 17.50 ft
p 47.30 ft
e 19.03 ft
p2 26.10 ft
e2 12.10 ft
i2 -
j2 -

Sails

Cheoy Lee Offshore 50 Ketch (Alden 50) - MAINSAIL

Luff * 47.3 ft - (14417 mm)
Foot * 19.03 ft - (5800 mm)
Leech * 50.18 ft - (15295 mm)
Tack Angle * 88.02 °
Diagonal * 50.37 ft - (15353 mm)
Head (inches) * 6 in - (152 mm)
Area 449.6 ft²
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Cheoy Lee Offshore 50 Ketch (Alden 50) - JIBSAIL

Luff * 44.39 ft - (13530 mm)
Foot * 23.33 ft - (7111 mm)
Leech * 38.3 ft - (11674 mm)
Percentage LP * 115 %
Length Perpendicular * 20.13 ft - (6136 mm)
Deck Angle * 12 °
Area 446.65 ft²
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Cheoy Lee Offshore 50 Ketch (Alden 50) - GENOA

Luff * 52.72 ft - (16069 mm)
Foot * 28.39 ft - (8653 mm)
Leech * 49.45 ft - (15072 mm)
Percentage LP * 150 %
Length Perpendicular * 26.25 ft - (8001 mm)
Deck Angle * 4 °
Area 691.96 ft²
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Cheoy Lee Offshore 50 Ketch (Alden 50) - MIZZEN

Luff * 26.1 ft - (7955 mm)
Foot * 12.1 ft - (3688 mm)
Leech-AftHdBd * 28.2 ft - (8595 mm)
Tack Ang * 87.99 °
Diag (clew/head) * 28.38 ft - (8650 mm)
Head (inches) * 5.25 in - (133 mm)
Area (no Roach) 157.7 ft²
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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.

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