Apparatus for boat sails

Apparatus for stretching the leech of a sail which may be rolled into or round the mast of a boat, characterized in that the apparatus comprises a plurality of separate, elongate, fluid-tight containers (6;16), inserted in mutually spaced pockets (5) made at vertical spacings in the sail (2;3), said containers extending substantially horizontally from the leech of the sail to a place at a distance from the luff of the sail, the edges of the containers situated in the vicinity of the leech of the sail being connected to a pump (10) common to all of said containers for inflating said containers into a substantially stiff shape, and said containers being connected to each other and the pump (10) by a hose (9) running along the leech of the sail (2) and affixed thereto.