Irwin 3/4 Ton
Description
The Irwin ¾ Ton (also known as the Irwin 30 Competition or Irwin 30 Racer, built 1978–1980, ~40 hulls) was Ted Irwin’s dedicated IOR ¾-Ton Level Rating racer – a stripped-out, high-performance version of the standard Irwin 30 hull pushed to the absolute limits of the rule. Key specs: LOA 30′0″, LWL 26′10″, beam 10′2″, displacement ~9,200–9,600 lbs (lighter than the cruiser version), deep fin keel with 5′6″ draft, 4,600 lb lead ballast (≈48–50% ratio), tall fractional sloop rig with large roachy mainsail and overlapping genoas (SA/D ≈19.5–21), giving it genuine planing ability downwind and excellent upwind speed for its era. Many rated around 24.0–24.5 under IOR and dominated regional PHRF fleets in the late 1970s. Below decks it’s spartan: open saloon with pipe berths, tiny galley, small, enclosed head, and a huge cockpit for crew work. Construction is solid fiberglass hull with balsa-cored deck and the typical Irwin molded liner, but with upgraded chainplates and rigging for racing loads.
Construction Details
| Designer | Ted Irwin |
|---|---|
| Builder | Irwin Yachts |
| Length | 35.000 ft |
| LOA | 34.000 ft |
| LWL | 28.250 ft |
| Beam | 9.500 ft |
| Displacement | 9715 lb |
| Max Draft | 4.500 ft |
The standard boat dimensions
| i | 43.50 ft |
|---|---|
| j | 14 ft |
| p | 37 ft |
| e | 11 ft |
| p2 | - |
| e2 | - |
| i2 | - |
| j2 | - |
| I | J | P | E | P2 | E2 | I2 | J2 |
|---|---|---|---|---|---|---|---|
| 43.50 ft | 14 ft | 37 ft | 11 ft | - | - | - | - |
Sails
Irwin 3/4 Ton - MAINSAIL
| Luff | * 37 ft - (11278 mm) |
|---|---|
| Foot | * 11 ft - (3353 mm) |
| Leech | * 38.12 ft - (11619 mm) |
| Tack Angle | * 88 ° |
| Diagonal | * 38.23 ft - (11653 mm) |
| Head (inches) | * 4.5 in - (114 mm) |
| Area | * 210.242 ft² |
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Irwin 3/4 Ton - JIBSAIL
| Luff | * 36.56 ft - (11143 mm) |
|---|---|
| Foot | * 18.56 ft - (5657 mm) |
| Leech | * 31.72 ft - (9668 mm) |
| Percentage LP | * 115 % |
| Length Perpendicular | * 16.1 ft - (4907 mm) |
| Deck Angle | * 12 ° |
| Area | * 294.34 ft² |
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Irwin 3/4 Ton - SPINNAKER
| Stays | * 43.42 ft - (13234 mm) |
|---|---|
| MidGirth | * 25.2 ft - (7681 mm) |
| Foot | * 25.2 ft - (7681 mm) |
| Perc LP | * 180 % |
| Area | * 930 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.