- Length
- 9.47 m
- Beam
- 2.92 m
- Draft
- 2.29 m
- Sail area
- 41.62 m²
Specifications
Dimensions & displacement7
- Length overall
- 9.47 m
- Waterline length
- 6.78 m
- Beam
- 2.92 m
- Draft
- 2.29 m
- Minimum draft
- 1.01 m
- Displacement
- 4,354 kg
- Ballast
- 1,724 kg
Sails & rig9
- Rig type
- Sloop, masthead rig
- Sail area
- 41.62 m²
- Mainsail area
- 20.81 m²
- Foresail area
- 20.8 m²
- Foretriangle height (I)
- 11.28 m
- Foretriangle base (J)
- 3.69 m
- Mainsail luff (P)
- 9.75 m
- Mainsail foot (E)
- 4.27 m
- Forestay length
- 11.87 m
Engine & propulsion4
- Engine power
- 25 hp
- Engine type
- Petrol
- Engine make
- Universal
- Engine model
- Atomic 4
Hull & construction3
- Hull material
- Fibreglass, balsa-cored sandwich
- Keel type
- Keel with centreboard
- Ballast material
- Lead
Tanks2
- Fuel tank
- 95 L
- Fresh water tank
- 189 L
Production & design2
- Production started
- 1968
- Designer
- Ted Irwin
Performance ratios6
- Sail area / displacement
- 15.92
- Displacement / length
- 389.07
- Ballast / displacement
- 39.6 %
- Comfort ratio
- 29.37
- Capsize screening
- 1.81
- Hull speed
- 6.32 kn
Yacht photography
Years, generations and variants
Irwin 311 generation
01
1968 — status pending