Bostrom 31 Mk II Sailboats for Sale & Market Overview

Drawing Diagram

Builder drawing

Hull type

Monohull · fin

Rig

Masthead Sloop

LOA

30.61' · 9.33 m

Displ.

7,275 lbs · 3,300 kg

First year

1977

The Bostrom 31 Mk II, widely recognized in Northern Europe as the B31, represents a significant chapter in Scandinavian yacht design. Designed by Bruno Boström in the early 1970s, the vessel was a prolific success for the Boström Båtar yard in Sweden, with over 1,000 units reportedly produced. The Mk II iteration is a refined version of the original Mk I, featuring subtle improvements to the deck mold and interior ergonomics that addressed feedback from early hull owners. Characterized by its traditional "Sframe" hull characteristics—though technically a fin keel with a deep skegmounted rudder—the B31 was born from an era where seaworthiness and a balanced helm were prioritized over the widebeam, highvolume designs seen in contemporary coastal cruisers.