Cheoy Lee Offshore 50 (Alden 50) Tall Rig
Description
The Cheoy Lee Offshore 50 (also known as the Alden 50 or Offshore 50 Ketch) 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 1966–1970s). It was designed by John G. Alden (renowned American naval architect known for elegant, seaworthy offshore designs); production was very limited at approximately 12 hulls (per sailboatdata.com; some owner/Alden sources suggest up to 17–20+ including variants like aft/center cockpit or deckhouse layouts, with one noted steel hull built in Holland). Special features include its long/full keel for exceptional 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 (balanced for short-handed manageability, with tall rig variant offering increased sail area and performance); spacious accommodations (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 50–60+ 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 |
The standard boat dimensions
| i | 56.70 ft |
|---|---|
| j | 17.50 ft |
| p | 51.42 ft |
| e | 19.03 ft |
| p2 | 28.20 ft |
| e2 | 12.10 ft |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 56.70 ft | 17.50 ft | 51.42 ft | 19.03 ft | 28.20 ft | 12.10 ft | - | - |
Sails
Cheoy Lee Offshore 50 (Alden 50) Tall Rig - MAINSAIL
| Luff | * 51.42 ft - (15673 mm) |
|---|---|
| Foot | * 19.03 ft - (5800 mm) |
| Leech | * 54.03 ft - (16468 mm) |
| Tack Angle | * 87.99 ° |
| Diagonal | * 54.2 ft - (16520 mm) |
| Head (inches) | * 6 in - (152 mm) |
| Area | 488.78 ft² |
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Cheoy Lee Offshore 50 (Alden 50) Tall Rig - JIBSAIL
| Luff | * 47.47 ft - (14469 mm) |
|---|---|
| Foot | * 23.04 ft - (7023 mm) |
| Leech | * 41.46 ft - (12637 mm) |
| Percentage LP | * 115 % |
| Length Perpendicular | * 20.13 ft - (6136 mm) |
| Deck Angle | * 12 ° |
| Area | 477.62 ft² |
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Cheoy Lee Offshore 50 (Alden 50) Tall Rig - GENOA
| Luff | * 56.37 ft - (17182 mm) |
|---|---|
| Foot | * 28.15 ft - (8580 mm) |
| Leech | * 53.15 ft - (16200 mm) |
| Percentage LP | * 150 % |
| Length Perpendicular | * 26.25 ft - (8001 mm) |
| Deck Angle | * 4 ° |
| Area | 739.96 ft² |
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Cheoy Lee Offshore 50 (Alden 50) Tall Rig - MIZZEN
| Luff | * 28.2 ft - (8595 mm) |
|---|---|
| Foot | * 12.1 ft - (3688 mm) |
| Leech-AftHdBd | * 30.12 ft - (9181 mm) |
| Tack Ang | * 87.97 ° |
| Diag (clew/head) | * 30.29 ft - (9232 mm) |
| Head (inches) | * 5.25 in - (133 mm) |
| Area (no Roach) | 170.39 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.