Kirby 1/4 Ton
Description
The Kirby 1/4 Ton (also known as Kirby 1/4 T or simply Kirby 1/4 Tonner) is a Canadian fiberglass cruiser-racer designed by Bruce Kirby (the renowned Canadian naval architect famous for the Laser dinghy and many other boats). It was created in 1975 as a production-oriented Quarter Ton Cup contender under the International Offshore Rule (IOR), balancing competitive racing performance with reasonable cruising comfort. Built primarily by New Orleans Marine and Competition Marine Ltd. (with some custom cold-molded versions noted), it features a fin keel with spade rudder for responsive handling, masthead sloop rig for all-around performance, and a compact yet functional interior (berths for 4–6, galley, head). It's known for excellent light-air speed, stability, and a traditional heavy displacement profile typical of mid-1970s IOR designs (pintail stern, moderate beam). Production was limited to about 26 hulls, making it a rare classic today.
Construction Details
| Designer | Bruce Kirby |
|---|---|
| Builder | New Orleans Marine |
| Length | 25.000 ft |
| LOA | 25.920 ft |
| LWL | 20.170 ft |
| Beam | 9.420 ft |
| Displacement | 4300 lb |
| Ballast | 2000 lb |
| Max Draft | 4.830 ft |
| Year Built | 1975 |
The standard boat dimensions
| i | 32 ft |
|---|---|
| j | 10 ft |
| p | 27.75 ft |
| e | 8 ft |
| p2 | - |
| e2 | - |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 32 ft | 10 ft | 27.75 ft | 8 ft | - | - | - | - |
Sails
Kirby 1/4 Ton - MAINSAIL
| Luff | * 27.75 ft - (8458 mm) |
|---|---|
| Foot | * 8 ft - (2438 mm) |
| Leech | * 28.53 ft - (8696 mm) |
| Tack Angle | * 88 ° |
| Diagonal | * 28.61 ft - (8720 mm) |
| Head (inches) | * 3.5 in - (89 mm) |
| Area | 110.89 ft² |
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Kirby 1/4 Ton - JIBSAIL
| Luff | * 26.82 ft - (8175 mm) |
|---|---|
| Foot | * 13.19 ft - (4020 mm) |
| Leech | * 23.38 ft - (7126 mm) |
| Percentage LP | * 115 % |
| Length Perpendicular | * 11.5 ft - (3505 mm) |
| Deck Angle | * 12 ° |
| Area | 154.19 ft² |
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Kirby 1/4 Ton - GENOA
| Luff | * 31.85 ft - (9708 mm) |
|---|---|
| Foot | * 16.11 ft - (4910 mm) |
| Leech | * 30 ft - (9144 mm) |
| Percentage LP | * 150 % |
| Length Perpendicular | * 15 ft - (4572 mm) |
| Deck Angle | * 4 ° |
| Area | 238.91 ft² |
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Kirby 1/4 Ton - SPINNAKER
| Stays | * 31.85 ft - (9708 mm) |
|---|---|
| MidGirth | * 18 ft - (5486 mm) |
| Foot | * 18 ft - (5486 mm) |
| Perc LP | * 180 % |
| Area | 487.31 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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