IW-31

IW-31 photo IW-31 drawing

Sailboat Specifications


Hull Type:
Fin with rudder on skeg
Rigging Type:
Masthead Sloop
LOA:
30.33 ft / 9.24 m
LWL:
22.00 ft / 6.71 m
S.A. (reported):
357.00 ft2 / 33.17 m2
Beam:
8.83 ft / 2.69 m
Draft (max):
5.42 ft / 1.65 m
Draft (min):
Displacement:
7,800 lb / 3,538 kg
Ballast:
3,400 lb / 1,542 kg
S.A./Disp.:
14.57
Bal./Disp.:
43.59
Disp./Len.:
327.02
Construction:
FG
Ballast Type:
Iron
First Built:
1968
Last Built:
1985
# Built:
350
Builder:
IW-Varvet
Designer:
Sparkman & Stephens
Website:

Auxiliary Power/Water (orig. equip.)

Make:
Volvo Penta
Model:
MD18
Type:
Diesel
HP:
10

Sailboat Calculations

S.A./Disp.:
14.57
Bal./Disp.:
43.59
Disp./Len.:
327.02
Comfort Ratio:
27.03

Rig and Sail Particulars

I:
36.74 ft / 11.20 m
J:
11.42 ft / 3.48 m
P:
31.50 ft / 9.60 m
E:
9.35 ft / 2.85 m
SPL/TPS:
ISP:
S.A. Fore:
209.79 ft2 / 19.49 m2
S.A. Main:
147.26 ft2 / 13.68 m2
S.A. Total (100% Fore + Main Triangles)
357.05 ft2 / 33.17 m2
S.A./Disp. (calc.):
14.57
Est. Forestay Len.:
38.47 ft / 11.73 m

Sailboat Links

Builders:
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Notes

Based on RORC/IOR 1/2 ton proto.. S&S design #1899C. Similar to the SHE 31 by South Hants Engineering (UK). MK I (1968 – 1972): small stern, 'dinette' layout. MK II (1972 – 1980): larger stern, new deck, different wood trim. MK III (1980 – 1985): aluminium toe rail (instead of Teak), glass hatch, different hardware. Thanks to 'little wings' for providing additional information. Most detailed information can be found at: www.iw-31.de (in German)



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