The Iw 31 is a 30.33ft masthead sloop designed by Sparkman & Stephens and built in fiberglass by IW-Varvet (SWE) between 1968 and 1985.
350 units have been built.
The Iw 31 is a heavy sailboat which is slightly under powered. It is very stable / stiff and has an excellent righting capability if capsized. It is best suited as a coastal cruiser.
Main features
| Model | Iw 31 | ||
| Length | 30.33 ft | ||
| Beam | 8.83 ft | ||
| Draft | 5.42 ft | ||
| Country | Sweden (Europe) | ||
| Estimated price | $ 0 | ?? |
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Ratios
| Sail area / displ. | 14.57 | ||
| Ballast / displ. | 43.59 % | ||
| Displ. / length | 327.02 | ||
| Comfort ratio | 27.03 | ||
| Capsize | 1.78 |
Hull
| Hull type | Monohull fin keel with rudder on skeg | ||
| Construction | Fiberglass | ||
| Waterline length | 22 ft | ||
| Maximum draft | 5.42 ft | ||
| Displacement | 7800 lbs | ||
| Ballast | 3400 lbs | ||
| Hull speed | 6.29 knots |
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Rigging
| Rigging | Masthead Sloop | ||
| Sail area (100%) | 357 sq.ft | ||
| Air draft | 0 ft | ?? | |
| Sail area fore | 209.79 sq.ft | ||
| Sail area main | 147.26 sq.ft | ||
| I | 36.74 ft | ||
| J | 11.42 ft | ||
| P | 31.50 ft | ||
| E | 9.35 ft |
Engine
| Nb engines | 1 | ||
| Total power | 10 HP | ||
| Fuel capacity | 0 gals |
Accommodations
| Water capacity | 0 gals | ||
| Headroom | 0 ft | ||
| Nb of cabins | 0 | ||
| Nb of berths | 0 | ||
| Nb heads | 0 |
Builder data
| Builder | IW-Varvet (SWE) | ||
| Designer | Sparkman & Stephens | ||
| First built | 1968 | ||
| Last built | 1985 | ||
| Number built | 350 |
Other photos
Iw 31 for sale elsewhere on the web:
