Roberts 370
Description
The Bruce Roberts 370, part of the renowned Spray series designed in the 1970s by Australian naval architect Bruce Roberts for ambitious owner-builders, is a robust bluewater cruising sloop or cutter renowned for its multi-chine steel, aluminum, or fiberglass hulls and expedition-ready versatility, with dozens constructed worldwide for global voyages emphasizing durability and self-sufficiency. Measuring 37 feet 4 inches LOA (up to 39 feet for the S370A variant) with a 31-foot-8-inch LWL, 12-foot-4-inch beam, draft options of 4 feet 9 inches (shoal) or 6 feet 6 inches (deep fin keel), and a displacement of approximately 18,760 pounds including 7,000-8,000 pounds of ballast, this masthead-rigged vessel features a sail area of around 650-700 square feet across mainsail (P=40 ft, E=14 ft), genoa, and staysail for efficient performance in 15-35 knot winds, achieving 7-8.5 knot hull speeds with a stable, sea-kindly motion and options for pilothouse or center-cockpit layouts. Powered by a 30- to 50-horsepower diesel auxiliary like the Yanmar 4JH, its classic lines include a clipper bow, canoe stern, and moderate sheer on a heavy-duty welded or hand-laid hull with foam core decks, providing 6-foot-6-inch headroom in a voluminous interior for 6-8 berths across V-berth forward, U-shaped saloon, double aft cabin, L-galley, dual heads with showers, and generous tankage of 100-150 gallons fuel and 150-200 gallons water for extended autonomy. Proven in Pacific crossings and Antarctic expeditions—as in aluminum 370E builds like Soteria and steel S370B circumnavigators—the Roberts 370 delivers timeless seaworthiness and liveaboard comfort, making it a perennial choice for couples or small crews seeking adventure without compromise.
Construction Details
| Designer | Bruce Roberts-Goodson |
|---|---|
| Length | 37.330 ft |
| LOA | 37.330 ft |
| LWL | 31.660 ft |
| Beam | 12.330 ft |
| Displacement | 18760 lb |
| Ballast | 8000 lb |
| Max Draft | 6.500 ft |
| Min Draft | 4.750 ft |
The standard boat dimensions
| i | 45.75 ft |
|---|---|
| j | 16.37 ft |
| p | 40.22 ft |
| e | 13.83 ft |
| p2 | - |
| e2 | - |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 45.75 ft | 16.37 ft | 40.22 ft | 13.83 ft | - | - | - | - |
Documents
Sails
Roberts 370 - MAINSAIL
| Luff | * 40.22 ft - (12259 mm) |
|---|---|
| Foot | * 13.83 ft - (4215 mm) |
| Leech | * 41.8 ft - (12741 mm) |
| Tack Angle | * 88 ° |
| Diagonal | * 42.07 ft - (12823 mm) |
| Head (inches) | * 6 in - (152 mm) |
| Area | * 286.77 ft² |
| Edit in Calculator | |
Roberts 370 - JIBSAIL
| Luff | * 38.87 ft - (11848 mm) |
|---|---|
| Foot | * 22.12 ft - (6742 mm) |
| Leech | * 33.12 ft - (10095 mm) |
| Percentage LP | * 115 % |
| Length Perpendicular | * 18.83 ft - (5739 mm) |
| Deck Angle | * 12 ° |
| Area | 365.82 ft² |
| Edit in Calculator | |
Roberts 370 - GENOA
| Luff | * 46.16 ft - (14070 mm) |
|---|---|
| Foot | * 26.81 ft - (8172 mm) |
| Leech | * 43.07 ft - (13128 mm) |
| Percentage LP | * 149.97 % |
| Length Perpendicular | * 24.55 ft - (7483 mm) |
| Deck Angle | * 4 ° |
| Area | * 566.63 ft² |
| Edit in Calculator | |
Roberts 370 - ASYMMETRICAL
| Luff | 47 ft - (14326 mm) |
|---|---|
| Foot | 28 ft - (8534 mm) |
| Leech | 44 ft - (13411 mm) |
| Perc LP | * 165 % |
| Area | * 987 ft² |
| Edit in Calculator | |
Roberts 370 - STAYSAIL
| Luff | 32 ft - (9754 mm) |
|---|---|
| Foot | 12 ft - (3658 mm) |
| Leech | 29 ft - (8839 mm) |
| Length Perpendicular | * 10.86 ft - (3310 mm) |
| Area | * 173.73 ft² |
| Edit in Calculator | |
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.