Roberts 34
Description
The Bruce Roberts 34, a robust and versatile bluewater cruiser designed in the 1970s by Australian naval architect Bruce Roberts (with production refinements by Grahame Shannon), stands as a heavy-displacement workhorse for offshore passages and coastal exploration, distinct from the Spray series with its fin-keel hull, skeg-hung rudder, and cutter or sloop rig for balanced, short-handed sailing under 625 square feet of canvas; measuring 34 feet 4 inches overall (10.46 m LOA), 28 feet 8 inches waterline (8.74 m LWL), 11 feet 6 inches beam (3.50 m), 5 feet 6 inches draft (1.68 m, shoal 5 feet), and 15,750-pound displacement (7,144 kg) with 6,400 pounds of ballast (2,903 kg) yielding a low SA/D ratio of 16 for easy handling in 30-knot winds, it's constructed in fiberglass (Airex-cored for strength) or steel/wood by DIY builders, featuring a spacious interior with 6 feet 2 inches headroom, six berths (V-berth forward, saloon settees, aft cabin), U-galley, and ample tanks (110 gallons water, 56 gallons fuel) powered by a 27-hp Yanmar diesel. Renowned for its seaworthiness—proven in ocean crossings with a comfort ratio of 31, capsize screening of 1.84, and hull speed of 7.2 knots—this affordable design (build costs $40,000–$90,000 USD) excels in stability and load-carrying but may feel sluggish in light airs; variants like the pilothouse Coast 34 or Passage 34 add versatility, with plans available from bruceroberts.com
The standard boat dimensions
| i | 38.33 ft |
|---|---|
| j | 13 ft |
| p | 31.67 ft |
| e | 10.42 ft |
| p2 | - |
| e2 | - |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 38.33 ft | 13 ft | 31.67 ft | 10.42 ft | - | - | - | - |
Documents
Blueprints
Sails
Roberts 34 - MAINSAIL
| Luff | * 31.67 ft - (9653 mm) |
|---|---|
| Foot | * 10.42 ft - (3176 mm) |
| Leech | * 32.79 ft - (9994 mm) |
| Tack Angle | * 88 ° |
| Diagonal | * 32.99 ft - (10055 mm) |
| Head (inches) | * 4.5 in - (114 mm) |
| Area | * 170.12 ft² |
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Roberts 34 - JIBSAIL
| Luff | * 32.38 ft - (9869 mm) |
|---|---|
| Foot | * 17.4 ft - (5304 mm) |
| Leech | * 27.83 ft - (8483 mm) |
| Percentage LP | * 115 % |
| Length Perpendicular | * 14.95 ft - (4557 mm) |
| Deck Angle | * 12.05 ° |
| Area | * 242.01 ft² |
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Roberts 34 - JIBSAIL
| Luff | 37 ft - (11278 mm) |
|---|---|
| Foot | 20 ft - (6096 mm) |
| Leech | 37 ft - (11278 mm) |
| Percentage LP | * 148.15 % |
| Length Perpendicular | * 19.26 ft - (5870 mm) |
| Deck Angle | * -3.05 ° |
| Area | * 356.23 ft² |
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Roberts 34 - GENOA
| Luff | * 38.45 ft - (11720 mm) |
|---|---|
| Foot | * 21.14 ft - (6443 mm) |
| Leech | * 36.02 ft - (10979 mm) |
| Percentage LP | * 150 % |
| Length Perpendicular | * 19.5 ft - (5944 mm) |
| Deck Angle | * 3.98 ° |
| Area | * 374.88 ft² |
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Roberts 34 - GENOA
| Luff | 37 ft - (11278 mm) |
|---|---|
| Foot | 20 ft - (6096 mm) |
| Leech | 34 ft - (10363 mm) |
| Percentage LP | * 140 % |
| Length Perpendicular | * 18.2 ft - (5547 mm) |
| Deck Angle | * 5.73 ° |
| Area | * 336.77 ft² |
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Roberts 34 - DRIFTER
| Luff | * 38.45 ft - (11720 mm) |
|---|---|
| Foot | * 22.03 ft - (6715 mm) |
| Leech | * 34.29 ft - (10452 mm) |
| Perc LP | * 150 % |
| Length Perp | * 19.5 ft - (5944 mm) |
| Deck Angle | * 8.98 ° |
| Area | * 374.93 ft² |
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Roberts 34 - ASYMMETRICAL
| Luff | * 38.45 ft - (11720 mm) |
|---|---|
| Foot | * 21.45 ft - (6538 mm) |
| Leech | * 35.37 ft - (10781 mm) |
| Perc LP | * 165 % |
| Area | * 619 ft² |
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Roberts 34 - STORMJIB
| Luff | * 22.26 ft - (6785 mm) |
|---|---|
| Foot | * 9.86 ft - (3005 mm) |
| Leech | * 16.95 ft - (5166 mm) |
| Perc LP | * 54.46 % |
| Length Perp | * 7.08 ft - (2158 mm) |
| Deck Angle | * 25.35 ° |
| Area | * 78.82 ft² |
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Roberts 34 - STORMTRYSAIL
| Luff | * 11.75 ft - (3581 mm) |
|---|---|
| Foot | * 10.8 ft - (3292 mm) |
| Leech | * 9.79 ft - (2984 mm) |
| Length Perp | * 9.79 ft - (2984 mm) |
| Tack Angle | * -25 ° |
| Area | * 49 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.