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Offshore 50 Cheoy Lee
Designer: Alden & Associates  ·  Builder: Cheoy Lee Shipyard Ltd.  ·  First built: 1966
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About the Offshore 50 Cheoy Lee

Built by the respected Hong Kong shipyard Cheoy Lee, the Offshore 50 carries the hallmarks of a builder long associated with quality construction and serious bluewater capability. Cheoy Lee earned a strong reputation throughout the latter half of the twentieth century for producing well-finished, robustly built sailing vessels, and the Offshore series represented some of their most accomplished work aimed at the dedicated offshore cruiser. Designed with passage-making in mind, the Offshore 50 is well suited to sailors seeking a capable and comfortable platform for extended offshore voyages and ocean crossings. The larger size of the hull suggests generous interior volume, making it an appealing choice for liveaboard cruising or long-distance adventures where comfort over time matters as much as raw performance. While detailed specifications are limited, Cheoy Lee's general construction philosophy leaned toward solid, conservative builds that prioritize seaworthiness and durability over racing pedigree. Prospective buyers interested in this model would benefit from seeking out individual vessel surveys, as build quality and outfitting can vary across production years. Overall, the Offshore 50 represents a compelling option for serious cruisers with an eye for craftsmanship.

Core Dimensions
LOA (Length Overall) 50.33 ft / 15.34 m
LWL (Waterline Length) 34.67 ft / 10.57 m
Beam 13.16 ft / 4.01 m
Max Draft 6.50 ft / 1.98 m
Displacement 34,000.00 lb / 15,422 kg
Ballast 14,000.00 lb / 6,350 kg
Sail Area (Reported) 1,154.00 ft² / 107.21 m²
Design & Construction
Hull Type Long Keel
Rigging Type Masthead Ketch
Construction FG
Designer Alden & Associates
Builder Cheoy Lee Shipyard Ltd.
First Built 1966
Related Sailboats ["Columbia 50" · "Swan 50 Ss" · "Taswell 50" · "Stevens 50" · "Little Harbor 51"]
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Known Issues & What to Watch For

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Performance Ratios
SA/Displacement Sail Area to Displacement ratio measures how much sail power a boat has relative to its weight. Higher values mean more performance and speed.
Under 14 — Heavy cruiser, slow14–18 — Cruising sailboat18–22 — Cruiser/racerOver 22 — Performance racer
 17.67
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
 43.13
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
 1.63
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. 7.89
S# (Speed Number) The Speed Number (S#) is a quick performance index. Higher values indicate a faster, more powerful design relative to its size.
Under 3.0 — Slow cruiser3.0–5.0 — Average cruiser5.0–7.0 — Performance cruiserOver 7.0 — Racer
 1.13
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. 1.0
Rig Dimensions
I (Foretriangle Height) 52.66
J (Foretriangle Base) 17.5
P (Mainsail Luff) 47.3
E (Mainsail Foot) 19.03
SA Fore 460.78
SA Main 450.06
How It Compares

vs. Stevens 50, Swan 50 Ss, Taswell 50

This boat Similar boats
Dimensions
LOA
Offshore 50 Cheoy Lee ★
50.3 ft
Stevens 50
50.0 ft
Swan 50 Ss
50.2 ft
Taswell 50
50.1 ft
LWL
Offshore 50 Cheoy Lee ★
34.7 ft
Stevens 50
37.8 ft
Swan 50 Ss
37.3 ft
Taswell 50
41.9 ft
Beam
Offshore 50 Cheoy Lee ★
13.2 ft
Stevens 50
14.3 ft
Swan 50 Ss
13.6 ft
Taswell 50
15.0 ft
Displacement
Offshore 50 Cheoy Lee ★
34 lbs
Stevens 50
31 lbs
Swan 50 Ss
36 lbs
Taswell 50
40 lbs
Ballast
Offshore 50 Cheoy Lee ★
14 lbs
Stevens 50
12 lbs
Swan 50 Ss
14 lbs
Taswell 50
11 lbs
Sail Area
Offshore 50 Cheoy Lee ★
1 sq ft
Stevens 50
1 sq ft
Swan 50 Ss
1 sq ft
Taswell 50
1 sq ft
Performance
SA / Displacement (higher = more powerful)
Offshore 50 Cheoy Lee ★
17.7
Stevens 50
18.7
Swan 50 Ss
15.2
Taswell 50
15.1
Ballast / Disp (higher = stiffer)
Offshore 50 Cheoy Lee ★
—
Stevens 50
38.5 %
Swan 50 Ss
39.2 %
Taswell 50
28.8 %
Comfort Ratio (higher = more comfortable offshore)
Offshore 50 Cheoy Lee ★
43.1
Stevens 50
33.6
Swan 50 Ss
41.8
Taswell 50
37.8
Capsize Screening (lower = safer)
Offshore 50 Cheoy Lee ★
1.63
Stevens 50
1.82
Swan 50 Ss
1.65
Taswell 50
1.76
Displacement / Length (lower = lighter)
Offshore 50 Cheoy Lee ★
—
Stevens 50
258
Swan 50 Ss
310
Taswell 50
242
Hull Speed
Offshore 50 Cheoy Lee ★
7.9 kts
Stevens 50
8.2 kts
Swan 50 Ss
8.2 kts
Taswell 50
8.7 kts
Speed Number (higher = faster)
Offshore 50 Cheoy Lee ★
1.1
Stevens 50
—
Swan 50 Ss
1.5
Taswell 50
—
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