Sail or pliant lifting surface used as a motive power comprising at least one skin member composed of (31, 41) or plurality of panels which can be provided with a plurality of pliant flat grid members defining a lattice work pattern and a plurality of pliant flat structural members (24) interconnectingly with said panels for predominant load bearing of a load exerted on said surface, said plurality of flat structural members, interconnectingly joining said panels and projecting securedty into a point-load location on said lifting surface.;The skin member is of fabric or a laminate in a plurality of panels, selected from a polyester fabric, aramid fabric, aramid-polyester film laminate or polyester-polyester film laminate, and said plurality of pliant flat structural members are of an aramid material such as Kevlar fabric.
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