Roberts 493
Description
The Bruce Roberts 493 is a robust, owner-buildable bluewater cruising ketch designed by Australian naval architect Bruce Roberts in the 1980s, renowned for its seaworthy multi-chine fiberglass hull and versatility in long-distance voyages, with over a dozen examples constructed worldwide as custom one-offs emphasizing durability and comfort for couples or small families. Measuring 49 feet LOA with a 40-foot LWL, 14-foot-1-inch beam, 6-foot-10-inch draft on a long fin keel, and a displacement of 39,000 pounds including 16,000 pounds of external ballast, this cutter-rigged ketch offers a sail area of 1,055 square feet across mainsail, mizzen, genoa, and staysail for balanced performance in 20-40 knot winds, achieving 7-9 knot hull speeds with minimal weather helm, powered by a reliable 40- to 110-horsepower diesel auxiliary like the Yanmar 4JH series. Its classic lines feature a canoe stern, moderate sheer, and teak accents on a hand-laid GRP hull with foam core options, providing 6-foot-6-inch headroom in a spacious interior layout including an L-shaped galley, U-shaped dinette, double aft cabin, forward V-berth, large head with shower, and ample storage alongside 200 gallons of fuel and 400 gallons of water tanks for extended autonomy. Proven in circumnavigations and Caribbean charters, as seen in well-equipped 1990s builds like those auctioned in Europe, the Roberts 493 blends timeless aesthetics with practical seaworthiness, making it a enduring favorite for serious offshore adventurers seeking self-sufficiency without sacrificing livability.
Construction Details
| Designer | Bruce Roberts-Goodson |
|---|---|
| Length | 49.000 ft |
| LOA | 34.416 ft |
| LWL | 28.750 ft |
| Beam | 11.583 ft |
| Max Draft | 5.750 ft |
| Min Draft | 4.250 ft |
The standard boat dimensions
| i | 55 ft |
|---|---|
| j | 18.17 ft |
| p | 49 ft |
| e | 15.75 ft |
| p2 | 33.25 ft |
| e2 | 10.50 ft |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 55 ft | 18.17 ft | 49 ft | 15.75 ft | 33.25 ft | 10.50 ft | - | - |
Documents
Sails
Roberts 493 - MAINSAIL
| Luff | * 49 ft - (14935 mm) |
|---|---|
| Foot | * 15.75 ft - (4801 mm) |
| Leech | * 50.79 ft - (15481 mm) |
| Tack Angle | * 87.99 ° |
| Diagonal | * 50.94 ft - (15527 mm) |
| Head (inches) | * 6 in - (152 mm) |
| Area | 385.48 ft² |
| Edit in Calculator | |
Roberts 493 - JIBSAIL
| Luff | * 46.34 ft - (14124 mm) |
|---|---|
| Foot | * 24.2 ft - (7376 mm) |
| Leech | * 40.03 ft - (12201 mm) |
| Percentage LP | * 115 % |
| Length Perpendicular | * 20.9 ft - (6370 mm) |
| Deck Angle | * 12 ° |
| Area | 484.26 ft² |
| Edit in Calculator | |
Roberts 493 - GENOA
| Luff | * 55.03 ft - (16773 mm) |
|---|---|
| Foot | * 29.45 ft - (8976 mm) |
| Leech | * 51.64 ft - (15740 mm) |
| Percentage LP | * 150 % |
| Length Perpendicular | * 27.26 ft - (8309 mm) |
| Deck Angle | * 4 ° |
| Area | 749.82 ft² |
| Edit in Calculator | |
Roberts 493 - SPINNAKER
| Stays | * 55.03 ft - (16773 mm) |
|---|---|
| MidGirth | * 32.71 ft - (9970 mm) |
| Foot | * 32.71 ft - (9970 mm) |
| Perc LP | * 180 % |
| Area | 1530.03 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.