Patent ID: 8635966
Filing Date: 2014-01-28
Classification: B63H

Abstract:
1. A sail having a thin airfoil shape a sail surface having air flow a windward and leeward side a head a foot a chord length, a venting assembly comprising one or more aperture having an aperture gap separating a fore element having a fore element leach edge and an aft element having an aft element luff edge forming said aperture, each said aperture is coplanar having an in-plane axis substantially perpendicular with respect to said sail surface and said fore element leach edge is disposed substantially adjacent to said aft element luff edge and substantially perpendicular with respect to said air flow when under sail, channeling air from said windward side of said sail through said aperture to said leeward side of said sail parallel to said sail surface, thereby energizing the surface boundary layer and maintaining laminar air flow along said aft element; each aperture having one or more aperture control element comprised of a spacer line pivotally connecting said fore element leach edge and said aft element luff edge, maintaining said fore element leach edge substantially adjacent to said aft element luff edge and said sail surface substantially parallel, with a substantially equidistant said aperture gap along said aperture when under sail on either tack, and said aperture are centrally located on said sail separating said fore and said aft element.