| Irwin 10/4 | |
| Designer: | Ted Irwin and Walter Scott |
| Location: | United States |
| Year: | 1975 |
| Builder: | Irwin Yachts |
| Role: | Cruiser |
| Draft: | 6.67feet, with centerboard down |
| Displacement: | 70000NaN0 |
| Hull Type: | monohull |
| Construction: | fiberglass |
| Loa: | 25.33feet |
| Lwl: | 21.83feet |
| Beam: | 10.33feet |
| Engine: | Yanmar 80NaN0 diesel engine or Universal Atomic 2 gasoline engine |
| Keel Type: | modified long keel |
| Ballast: | 20000NaN0 |
| Rudder Type: | internally-mounted spade-type rudder |
| Rig Type: | Cutter rig |
| I: | 35feet |
| J: | 12feet |
| P: | 30.16feet |
| E: | 12.25feet |
| Sailplan: | cutter rigged sloop |
| Sailarea Main: | 184.73square feet |
| Sailarea Headsail: | 210square feet |
| Sailarea Total: | 394.73square feet |
| Phrf: | 234 |
The Irwin 10/4 is an American trailerable sailboat that was designed by Ted Irwin and Walter Scott as a cruiser and first built in 1975.[1] [2] [3] [4]
Unconventionally, the boat's designation indicates its beam of 10feet, rather than its length overall.[4]
The design was built by Irwin Yachts in the United States, from 1975 until 1982, but it is now out of production.[1] [4] [5]
The Irwin 10/4 is a recreational keelboat, built predominantly of fiberglass, with wood trim. It is a cutter rigged sloop, with a raked stem with a bowsprit, an angled transom, an internally mounted spade-type rudder controlled by a wheel and a fixed long keel, with a cutaway forefoot and a centerboard. It displaces 70000NaN0 and carries 20000NaN0 of ballast.[1] [4]
The boat has a draft of 6.67feet with the centerboard extended and 2.75feet with it retracted, allowing operation in shallow water, or ground transportation on a trailer.[1] [4]
The boat is fitted with a Japanese Yanmar diesel engine of 80NaN0 or a Universal Atomic 2 gasoline engine for docking and maneuvering. The fuel tank holds and the fresh water tank has a capacity of .[1] [4]
The design has sleeping accommodation for four people, with a double "V"-berth in the bow cabin and a U-shaped settee in the main cabin that can be combined with a drop-dinette table to become a second double berth. The galley is located on the starboard side just forward of the companionway ladder. The galley is L-shaped and is equipped with a two-burner stove and a sink. The icebox is accessible from both the galley and the cockpit. The enclosed head is located just aft of the bow cabin on the port side. Cabin headroom is 680NaN0.[1] [4]
The design has a PHRF racing average handicap of 234 and a hull speed of 6.3kn.[4]
The boat is supported by an active class club, the Irwin Yacht Owners.[6]
In a 2010 review Steve Henkel wrote, "best features: Her layout below provides a feeling of spaciousness rare in a 25-footer. Her heavy displacement and wide beam makes her stable in a breeze. The icebox, on the port side, is accessible both from the cockpit (so those on deck don't have to bother the cook to get a cold drink) and also from below deck. Worst features: In light air she's slow. There was one of these in our home harbor, and I remember literally running rings around her in four or five knots with our (then) South Coast 23. Over 10 knots of breeze, she peps up."[4]
