Abstract: Disclosed is a kite or wing with a canopy made of a film material which cannot be folded without being creased but having one or more strips of flexible material running across the canopy, wherein the flexible material can be folded without creasing, The kite or wing can be folded along the flexible material strips and then rolled up from the canopy ends for storage or transport.

Abstract: A massive de-powering system for a kite wing used in kite boarding comprises a deflation control line that connects to a valve on the kite wing's leading edge bladder. In the preferred embodiment, disengaging the tether line from the harness causes the deflation control line to tension and to open the valve, thereby deflating the bladder. Tension along the deflation control line may also act to draw in spaced portions of the wing thereby collapsing it and further reducing the power generated by the wing.

Abstract: A so-called “wing” sail for a sailing vessel, having an airfoil section performing substantially in the manner of an ideal airfoil on either tack is described. A two-sided inner sail structure having resiliently deformable battens slidably engaging a track, fixed to the mast of the sailing device and extending rearwardly, the mast being rotatable about its vertical axis in either direction relative to vertical planes along the longitudinal axes of the sailing device and the boom. Translation of the two main surfaces of the wing sail as well as the surfaces at the clew corner while maintaining proper tension in the surfaces, is accomplished by opposed inflatable air bladders. An aerodynamic seal is provided along the trailing edge of the wing sail. A horizontal control bar is attached to the mast to control the pivotal movement of the mast. The outer sail members wrap, around the mast and are fastened to the mast by a zipper.