Irwin 37 Ketch
Description
The Irwin 37 is a fiberglass center-cockpit cruising sailboat designed by naval architect Ted Irwin and built by Irwin Yachts from 1971 to 1982. Marketed as a "no-compromise" cruiser, it emphasizes spacious interiors, family-friendly livability, and ease of handling for coastal and moderate offshore sailing, with a focus on comfort over high performance. Available in sloop, cutter, or ketch rigs and keel configurations (shoal draft fixed, standard draft, or keel/centerboard), it's ideal for weekenders, liveaboards, or short passages like the Intracoastal Waterway or Bahamas hops. With nearly 600 hulls produced, it's one of Irwin's most successful models, though its light construction prioritizes volume over blue water ruggedness without upgrades. 18000 lbs. Disp. 5000 lbs. Ballast 30' LWL 11'6" Beam 4' Draft
The standard boat dimensions
| i | 42 ft |
|---|---|
| j | 14.33 ft |
| p | 35.50 ft |
| e | 12.75 ft |
| p2 | 22.17 ft |
| e2 | 8.33 ft |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 42 ft | 14.33 ft | 35.50 ft | 12.75 ft | 22.17 ft | 8.33 ft | - | - |
Sails
| Sail Type | MAINSAIL |
|---|---|
| Luff | * 35.5 ft - (10820 mm) |
| Foot | * 12.75 ft - (3886 mm) |
| Leech | * 37.02 ft - (11284 mm) |
| Tack Angle | * 88 ° |
| Diagonal | * 37.3 ft - (11369 mm) |
| Head (inches) | * 6 in - (152 mm) |
| Area | * 233.88 ft² |
| Sail Type | JIBSAIL |
|---|---|
| Luff | * 35.5 ft - (10820 mm) |
| Foot | * 19.19 ft - (5849 mm) |
| Leech | * 30.5 ft - (9296 mm) |
| Percentage LP | * 115 % |
| Length Perpendicular | * 16.48 ft - (5023 mm) |
| Deck Angle | * 11.99 ° |
| Area | * 292.49 ft² |
| Sail Type | GENOA |
|---|---|
| Luff | * 42.16 ft - (12850 mm) |
| Foot | * 23.33 ft - (7111 mm) |
| Leech | * 39.47 ft - (12030 mm) |
| Percentage LP | * 150.03 % |
| Length Perpendicular | * 21.5 ft - (6553 mm) |
| Deck Angle | * 4.01 ° |
| Area | * 453.2 ft² |
| Sail Type | ASYMMETRICAL |
|---|---|
| Luff | 43 ft - (13106 mm) |
| Foot | 24 ft - (7315 mm) |
| Leech | 40 ft - (12192 mm) |
| Perc LP | * 165 % |
| Area | * 774 ft² |
| Sail Type | MIZZEN |
|---|---|
| Luff | * 22.17 ft - (6757 mm) |
| Foot | * 8.33 ft - (2539 mm) |
| Leech-AftHdBd | * 23.17 ft - (7062 mm) |
| Tack Ang | * 88 ° |
| Diag (clew/head) | * 23.41 ft - (7135 mm) |
| Head (inches) | * 4 in - (102 mm) |
| Area (no Roach) | * 94.97 ft² |
| Sail Type | STORMJIB |
|---|---|
| Luff | * 24.41 ft - (7440 mm) |
| Foot | * 10.89 ft - (3319 mm) |
| Leech | * 19.71 ft - (6008 mm) |
| Perc LP | * 60.01 % |
| Length Perp | * 8.6 ft - (2621 mm) |
| Deck Angle | * 18.98 ° |
| Area | * 105 ft² |
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.