Wind-surfer sail arrangement - has rotatable mast and wishbone boom along diagonals of rhomboid sail and sheet to boom clew-end

摘要

The sail arrangement is unstayed, the sail stretched between the mast-ends and a curved wishbone-boom fixed to it at throat and clew. As in 2950439 the luff is secured along a spar forward of the mast and attached to its top and foot. The boom is secured to this spar. The mast is enclosed in the sail, doubled back to its after edge or beyond. A sheet is now fixed to the boom's clew-end and the mast can rotate about its axis. Sail shape is rhomboid, the mast dividing it into a larger, after and smaller, for'd triangle.