IW-31
Masthead Sloop • Fin with rudder on skeg • Built 1968–1985
Dimensions
- LOA
- 30.33 ft
- LWL
- 22 ft
- Beam
- 8.83 ft
- Max Draft
- 5.42 ft
- Displacement
- 7,800 lbs
- Ballast
- 3,400 lbs
Performance Ratios
- Capsize Ratio ⓘ
- 1.78 (offshore safe)
- SA/D Ratio ⓘ
- 14.5
- D/L Ratio ⓘ
- 327
- Ballast Ratio ⓘ
- 43.6%
Sail Plan
- Sail Area
- 357 sq ft
- I
- 36.74 ft
- J
- 11.42 ft
- P
- 31.5 ft
- E
- 9.35 ft
Construction
- Hull Type
- Fin with rudder on skeg
- Rig Type
- Masthead Sloop
- Hull Material
- FG
- Ballast Type
- Iron
Production
- First Built
- 1968
- Last Built
- 1985
- Number Built
- 350
Engine & Accommodations
- Engine Make
- Volvo Penta
- Engine Model
- MD18
- Power
- 10 hp
- Engine Type
- Diesel
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)
Designer
Builder
Class Associations
Related Boats
| Name | LOA (ft) | Year | Rig |
|---|---|---|---|
| SHE 31 | 30.33 | 1969 | Masthead Sloop |