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Sailboat Specifications

Offshore 31 Cheoy Lee

Masthead Sloop · Long Keel

Designed by Herreshoff/Cheoy Lee Shipyard · Built by Cheoy Lee Shipyard Ltd.(Hk) · First built 1968

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LOA 31.00 ft  ·  Beam 8.75 ft  ·  Displacement 10,700.00 lb  ·  Sail Area 403.00 ft²  ·  Masthead Sloop  ·  Long Keel
About the Offshore 31 Cheoy Lee Sailboat

Designed as a collaboration between the legendary Herreshoff design legacy and Hong Kong's respected Cheoy Lee Shipyard, this 31-footer emerged in 1968 as a capable offshore cruiser built to traditional seaworthy principles. The long keel configuration and substantial 10,700-pound displacement create a stable, predictable sailing platform that inspires confidence in challenging conditions. With a generous 35.88 comfort ratio, the Offshore 31 prioritizes seaworthiness over speed, making it an excellent choice for extended coastal cruising and offshore passages. The masthead sloop rig provides straightforward sail handling, while the conservative 13.32 sail area to displacement ratio delivers steady, manageable performance rather than racing speeds. The hull's 6.47-knot theoretical maximum speed reflects its cruising-oriented design philosophy. The fiberglass construction proved durable over the decades, and with only 150 hulls built during its production run, these boats have developed a loyal following among sailors who appreciate traditional sailing characteristics. The low 1.59 capsize screening value indicates excellent stability for ocean work, while the modest 3.67-foot draft allows exploration of shallow anchorages. This design appeals to sailors seeking a well-built, seaworthy vessel for serious coastal and offshore cruising adventures.

Dimensions & Specifications
LOA (Length Overall) 31.00 ft / 9.45 m
LWL (Waterline Length) 23.33 ft / 7.11 m
Beam 8.75 ft / 2.67 m
Max Draft 3.67 ft / 1.12 m
Displacement 10,700.00 lb / 4,853 kg
Ballast 3,800.00 lb / 1,724 kg
Ballast Type Iron
Sail Area (Reported) 403.00 ft² / 37.44 m²
Design & Construction
Hull Type Long Keel
Rigging Type Masthead Sloop
Construction FG
Designer Herreshoff/Cheoy Lee Shipyard
Builder Cheoy Lee Shipyard Ltd.(HK)
First Built 1968
Number Built 150
Associations Cheoy Lee Association Web Site
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Frequently Asked Questions

What is the Offshore 31 Cheoy Lee's sail area to displacement ratio?

The Offshore 31 Cheoy Lee has a Sail Area to Displacement ratio (SA/D) of 13.32. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Offshore 31 Cheoy Lee's comfort ratio?

The Offshore 31 Cheoy Lee has a Ted Brewer Comfort Ratio of 35.88. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Offshore 31 Cheoy Lee safe for offshore sailing?

The Offshore 31 Cheoy Lee has a Capsize Screening Formula value of 1.59. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Offshore 31 Cheoy Lee?

The theoretical hull speed of the Offshore 31 Cheoy Lee is 6.47 kn knots, calculated from its waterline length.

How much does a Offshore 31 Cheoy Lee weigh?

The Offshore 31 Cheoy Lee has a displacement of 10,700.00 lb and a length overall (LOA) of 31.00 ft.

Who designed the Offshore 31 Cheoy Lee?

The Offshore 31 Cheoy Lee was designed by Herreshoff/Cheoy Lee Shipyard, first built in 1968.