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IW-31
Built by IW-Varvet
• Designed by Sparkman & Stephens
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General Information
Hull Type:
Fin with rudder on skeg
Rigging Type:
Masthead Sloop
First Built:
1968
Last Built:
1985
Number Built:
350
Dimensions
Length Overall (LOA):
9.24 m
Length Waterline (LWL):
6.71 m
Beam:
2.69 m
Draft (Max):
1.65 m
Weight & Ballast
Displacement:
3,538 kg
Ballast:
1,542 kg
Ballast Type:
Iron
Sail Plan
Foresail Area:
19.49 m²
Mainsail Area:
13.68 m²
Sail Area:
33.17 m²
Sail Area (reported):
33.17 m²
I (Fore Triangle Height):
11.20 m
J (Fore Triangle Base):
3.48 m
P (Mainsail Hoist):
9.60 m
E (Boom Length):
2.85 m
Est. Forestay Length:
11.73 m
Engine & Systems
Engine Make:
Volvo Penta
Engine Type:
Diesel
Engine Model:
MD18
Engine Power:
10 HP
Performance Ratios
Hull Speed:
6.29 knots
SA/Displacement (Calc):
14.57
SA/Displacement (Reported):
14.57
Ballast/Disp Ratio:
43.59%
Displacement/Length:
327.02
Comfort Ratio:
27.03
Capsize Screening:
1.78
S-Number:
1.38
Immersion:
124 kg/cm
Notes
Based on RORC/IOR 1/2 ton proto.. S&S design #1899C. Similar to the SHE 31 by South Hants Engineering (UK).
Market Value
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