Jomar 55 Stsl Ketch
Description
The Jomar 55 STSL Ketch is a custom-built bluewater cruising ketch based on a Bruce Roberts design (specifically the Bruce Roberts 550 or a closely related plans series, known for robust offshore capability). It was professionally constructed by Jomar Company (or Jomarco Boats/Shipyard, a small custom yard in Santa Ana, California, USA) in the 1980s (examples from ~1982–1998 noted in sales records). The design draws from Roberts' popular amateur/professional build plans, featuring heavy fiberglass (GRP) hull construction for strength and impact resistance, a center cockpit layout for protection and comfort, full or long keel for excellent tracking and stability in heavy seas, and a ketch rig (or cutter in some hulls) for easy sail management during extended voyages. It emphasizes load-carrying ability, spacious interiors (often multiple cabins, large saloon/galley, navigation area, and substantial tankage), and seaworthiness suited to serious ocean cruising or liveaboard use—often described as "high-end custom" and "one of the best" from Roberts' lineup in owner/broker comments. Production was very limited (plans-based/custom; only a handful of hulls built by Jomarco, not mass-produced).
Construction Details
| Designer | Bruce Roberts-Goodson |
|---|---|
| Builder | Jomarco Boats (USA) |
| Length | 55.000 ft |
| LOA | 55.000 ft |
| Beam | 15.830 ft |
| Max Draft | 7.500 ft |
| Year Built | 1982 |
The standard boat dimensions
| i | 54.66 ft |
|---|---|
| j | 19.17 ft |
| p | 48.58 ft |
| e | 19.75 ft |
| p2 | - |
| e2 | - |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 54.66 ft | 19.17 ft | 48.58 ft | 19.75 ft | - | - | - | - |
Sails
Jomar 55 Stsl Ketch - MAINSAIL
| Luff | * 48.58 ft - (14807 mm) |
|---|---|
| Foot | * 19.75 ft - (6020 mm) |
| Leech | * 51.61 ft - (15731 mm) |
| Tack Angle | * 88 ° |
| Diagonal | * 51.8 ft - (15789 mm) |
| Head (inches) | * 6 in - (152 mm) |
| Area | 479.24 ft² |
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Jomar 55 Stsl Ketch - JIBSAIL
| Luff | * 46.34 ft - (14124 mm) |
|---|---|
| Foot | * 25.81 ft - (7867 mm) |
| Leech | * 39.62 ft - (12076 mm) |
| Percentage LP | * 115 % |
| Length Perpendicular | * 22.05 ft - (6721 mm) |
| Deck Angle | * 12 ° |
| Area | 510.82 ft² |
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Jomar 55 Stsl Ketch - GENOA
| Luff | * 55.03 ft - (16773 mm) |
|---|---|
| Foot | * 31.31 ft - (9543 mm) |
| Leech | * 51.42 ft - (15673 mm) |
| Percentage LP | * 150 % |
| Length Perpendicular | * 28.76 ft - (8766 mm) |
| Deck Angle | * 4 ° |
| Area | 791.07 ft² |
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Jomar 55 Stsl Ketch - SPINNAKER
| Stays | * 55.03 ft - (16773 mm) |
|---|---|
| MidGirth | * 34.51 ft - (10519 mm) |
| Foot | * 34.51 ft - (10519 mm) |
| Perc LP | * 180 % |
| Area | 1614.22 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.
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