Abstract: Embodiments of the present invention feature a device having aerodynamic lift surfaces that is capable of rotation about a stayed mast.

Abstract: This invention relates to the use of a venting assembly for conventional sails, comprising one or more aperture substantially perpendicular with the sail surface separating a fore and aft element of the sail. The aperture channels high energy air flow from the windward side of the sail through to the leeward side of the sail parallel to the sail surface, energizing the surface boundary layer and maintaining laminar air flow along the aft element of the sail.