Flexible wing rib sail
Flexible wing shape controlling device
Flexible wing-sail and wind-propelled vehicle including same
Fluid drag reducing apparatus
Fluid foil system
Forced foil sail
Foresail
Forestay connector
Frame spar for soft airfoils
Furling and unfurling device for asymmetric sails
Furling boom
Furling device for a sailing boat
Furling drum with fixed guard
Furling element
Furling foil for sailing vessel
Furling sail and means for turning mast
Furling sail system
Furling sail with protective panels
Furling stay cover
Furling system for sailboats