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IW-31
IW-30 photo on sailboatdata.com
IW-31 drawing on sailboatdata.com
Hyde Sails Direct

Hull Type:  Fin with rudder on skeg Rig Type:  Masthead Sloop
LOA:  30.33' / 9.24m LWL:  22.00' / 6.71m
Beam:  8.83' / 2.69m Listed SA:  357 ft2 / 33.17 m2
Draft (max.)  5.42' / 1.65m Draft (min.)  
Displacement:  7800 lbs./ 3538 kgs. Ballast:  3400 lbs. / 1542 kgs.
Sail Area/Disp.1:  14.57 Bal./Disp.:  43.58% Disp./Len.:  327.02
Designer:  Sparkman & Stephens
Builder:  IW-Varvet
Construction:  FG Bal. type:  Iron
First Built:  1968 Last Built:  1985 # Built:  350
AUXILIARY POWER (orig. equip.)
Make:  Volvo Penta Model:  MD18
Type:  Diesel HP:  10
RIG AND SAIL PARTICULARS  KEY
I(IG):  36.74' / 11.20m J:  11.42' / 3.48m
P:  31.50' / 9.60m E:  9.35' / 2.85m
PY:   EY:  
ISP:   SPL/TPS:  
SA(Fore.):  209.79 ft2 / 19.49 m2 SA(Main):  147.26 ft2 / 13.68 m2
Sail Area (100% fore+main triangles):   357.05 ft2 / 33.17 m2
Sail Area/Disp.2:  14.57 Est. Forestay Length.:  38.47' / 11.73m
BUILDERS (past & present)
More about & boats built by:   IW-Varvet (SWE)
DESIGNER
More about & boats designed by:    Sparkman & Stephens
RELATED LINKS
  IW-31 owners (in German)  www.iw-31.de
  Half Ton Class  sailboatdata.com/view_url.asp?id=661
SEE ALSO:
Related Boat:   SHE 31
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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