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Masthead Sloop · Fin with rudder on skeg · 1968–1985
The IW-31 is an S&S-designed boat based on a RORC/IOR half-ton prototype, similar to the SHE 31, produced in three marks between 1968 and 1985.
Is it for you?
Where this design lands on the numbers a shopper trusts — read straight from her own ratios.
A balanced, easily-driven cruiser — comfortable and forgiving for coastal work.
The record
The complete reference set — tap any figure to switch between metric and imperial.
The family
Nearby designs by size, type, and era — worth a look alongside her.