Irwin 12 Ton Sloop
Description
The Irwin 12 Ton sloop, built by Irwin Yachts in the early 1970s as a performance-oriented racer under the International Offshore Rule (IOR) for the 12-ton class. Designed by Ted Irwin, it featured a sleek fin-keel hull (LOA 32'0", LWL 24'5", beam 10'6", displacement ~12,000 lbs, ballast 5,500 lbs) with a deep draft of 5'6" (shoal version optional at 4'0"), a tall masthead sloop rig delivering ~450 sq ft of sail area (SA/D ~17.6 for solid upwind speed), and a spade rudder for responsive handling. It was a reasonably stiff, moderate performer suited for club racing and day-sailing, with a simple V-berth forward, saloon settees, galley, and quarter berth below—functional but spartan compared to Irwin's roomier cruisers. Only a handful were produced before evolving into the Mk II with refinements like a transom-hung rudder and daggerboard; today, they're rare classics on the used market, often praised for affordability and fun in moderate wind
The standard boat dimensions
| i | 37 ft |
|---|---|
| j | 12 ft |
| p | 35 ft |
| e | 6.25 ft |
| p2 | - |
| e2 | - |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 37 ft | 12 ft | 35 ft | 6.25 ft | - | - | - | - |
Blueprints
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.