Cal 27 T/2 (1/2 Ton)
Description
The Cal 1/2 Ton (also known as the Cal T/2 or Cal T/2 Tonner) is a classic American IOR half-ton racer designed by C. William Lapworth. Built by Jensen Marine (Cal Yachts) from 1972 to 1974, approximately 179 hulls were produced. It's essentially a modified version of the Cal 27 hull, with deck and rig alterations to meet the International Offshore Rule (IOR) 1/2-ton rating for competitive racing, featuring a lightweight fin keel with spade rudder for agile handling, solid hand-laid fiberglass construction, and a masthead sloop rig. Renowned for its speed and responsiveness in club racing or coastal day sailing, with a lively ride in 10–20 knots and surprising stability for its era, it's a fun vintage performer.
Construction Details
| Designer | C. William Lapworth |
|---|---|
| Builder | Jensen Marine (USA) |
| Length | 27.000 ft |
| LOA | 27.500 ft |
| LWL | 24.330 ft |
| Beam | 10.830 ft |
| Max Draft | 3.920 ft |
The standard boat dimensions
| i | 34.98 ft |
|---|---|
| j | 11.95 ft |
| p | 27.95 ft |
| e | 10.20 ft |
| p2 | - |
| e2 | - |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 34.98 ft | 11.95 ft | 27.95 ft | 10.20 ft | - | - | - | - |
Sails
Cal 27 T/2 (1/2 Ton) - MAINSAIL
| Luff | * 27.95 ft - (8519 mm) |
|---|---|
| Foot | * 10.2 ft - (3109 mm) |
| Leech | * 29.14 ft - (8882 mm) |
| Tack Angle | * 88.02 ° |
| Diagonal | * 29.42 ft - (8967 mm) |
| Head (inches) | * 4.5 in - (114 mm) |
| Area | * 146.11 ft² |
| Edit in Calculator | |
Cal 27 T/2 (1/2 Ton) - JIBSAIL
| Luff | 29.57 ft - (9013 mm) |
|---|---|
| Foot | * 16.01 ft - (4880 mm) |
| Leech | * 25.39 ft - (7739 mm) |
| Percentage LP | * 114.98 % |
| Length Perpendicular | * 13.74 ft - (4188 mm) |
| Deck Angle | * 12.03 ° |
| Area | * 203.14 ft² |
| Edit in Calculator | |
Cal 27 T/2 (1/2 Ton) - GENOA
| Luff | 35.12 ft - (10705 mm) |
|---|---|
| Foot | * 19.45 ft - (5928 mm) |
| Leech | * 32.87 ft - (10019 mm) |
| Percentage LP | * 149.96 % |
| Length Perpendicular | * 17.92 ft - (5462 mm) |
| Deck Angle | * 4.02 ° |
| Area | * 314.66 ft² |
| Edit in Calculator | |
Cal 27 T/2 (1/2 Ton) - SPINNAKER
| Stays | * 35.12 ft - (10705 mm) |
|---|---|
| MidGirth | * 21.51 ft - (6556 mm) |
| Foot | * 21.51 ft - (6556 mm) |
| Perc LP | * 180 % |
| Area | * 642 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.