Patent ID: 6892659

Claim:
Boat sail comprising a first ( 4 ) and a second ( 6 ) sheet, having similar shape and dimensions, coupled each other in correspondence of the outer perimeter and by a plurality of transverse ribs ( 12 ), provided between said sheets ( 4 , 6 ), suitable to divide said sail into multi-sections ( 11 ), said sail ( 2 ) having: a valve ( 14 ), that can be opened and closed to allow the air to enter within said sail into the space between said first ( 4 ) and second ( 6 ) sheets, at least a retractor element ( 15 ) provided on each rib ( 12 ), that can take two positions, respectively for the closure of the rib ( 12 and for opening the same, in order to make the sail taking a wing contour shape, and means ( 16 ) for opening and closing said retractors said at least one retractor ( 15 ) is comprised of two hemi-parts ( 15 ′, 15 ″), comprised of rigid material, having one end coupled to one of said sheets ( 4 , 6 ), and the other end centrally coupled to the corresponding end of the other hemi-part, said central ends being hinged in such a way to open and close the retractor ( 15 ), said retractor opening and closure means ( 16 ) acting on said central ends of the hemi-parts ( 15 ′, 15 ″) of the retractor ( 15 ).