Offshore 31 Ketch (Cheoy Lee 31)
Description
The Cheoy Lee Offshore 31 Ketch is a classic heavy-displacement cruising ketch designed by Sparkman & Stephens in the late 1960s and built by Cheoy Lee Shipyard in Hong Kong from 1969 to the early 1970s, with approximately 40-50 hulls produced. Based on the Bermuda 30 (itself an evolution of the Herreshoff 28), it features an extended counter stern and inboard rudder for enhanced seaworthiness, making it a popular choice for coastal and light offshore cruising by couples or small families. The ketch rig splits sail area for easy shorthanded handling, while the full long keel provides excellent directional stability in following seas. Constructed with solid hand-laid fiberglass hulls and teak accents, it offers a spacious interior for its size (sleeping 4-5) and a reputation for robust Hong Kong craftsmanship, though build quality varies by hull. Ideal for traditionalists seeking a "go-anywhere" pocket cruiser, it's praised for its motion comfort but critiqued for modest upwind performance and high maintenance on teak.
Construction Details
| Designer | Sparkman and Stephens |
|---|---|
| Builder | Cheoy Lee |
| Length | 31.000 ft |
The standard boat dimensions
| i | 31.50 ft |
|---|---|
| j | 11.50 ft |
| p | 27.50 ft |
| e | 13.08 ft |
| p2 | 18 ft |
| e2 | 8.75 ft |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 31.50 ft | 11.50 ft | 27.50 ft | 13.08 ft | 18 ft | 8.75 ft | - | - |
Blueprints
Sails
| Sail Type | MAINSAIL |
|---|---|
| Luff | * 27.5 ft - (8382 mm) |
| Foot | * 13.08 ft - (3987 mm) |
| Leech | * 29.75 ft - (9068 mm) |
| Tack Angle | * 88 ° |
| Diagonal | * 30.04 ft - (9156 mm) |
| Head (inches) | * 6 in - (152 mm) |
| Area | * 185.83 ft² |
| Sail Type | JIBSAIL |
|---|---|
| Luff | * 26.83 ft - (8178 mm) |
| Foot | * 15.6 ft - (4755 mm) |
| Leech | * 22.78 ft - (6943 mm) |
| Percentage LP | * 114.96 % |
| Length Perpendicular | * 13.22 ft - (4029 mm) |
| Deck Angle | * 12 ° |
| Area | * 177.37 ft² |
| Sail Type | GENOA |
|---|---|
| Luff | * 31.86 ft - (9711 mm) |
| Foot | * 18.89 ft - (5758 mm) |
| Leech | * 29.69 ft - (9050 mm) |
| Percentage LP | * 150 % |
| Length Perpendicular | * 17.25 ft - (5258 mm) |
| Deck Angle | * 3.99 ° |
| Area | * 274.81 ft² |
| Sail Type | MIZZEN |
|---|---|
| Luff | * 18 ft - (5486 mm) |
| Foot | * 8.75 ft - (2667 mm) |
| Leech-AftHdBd | * 19.64 ft - (5986 mm) |
| Tack Ang | * 87.95 ° |
| Diag (clew/head) | * 19.73 ft - (6014 mm) |
| Head (inches) | * 4 in - (102 mm) |
| Area (no Roach) | * 81.86 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.