Patent ID: 8919272
Filing Date: 2014-12-30
Classification: B63B,B63H

Abstract:
1. A device for powering a craft by aerodynamic forces, said craft having a mast member having a base end, a top end and an elongated body, said base end constructed and arranged for attachment to a base of said craft and said top end having one or more stay attachment points for at least one stay, said at least one stay having a mast securing end and a craft securing end, said at least one stay and said elongated body defining at least one cone of rotation when secured to said craft and mast member, and at least one of said cone of rotation being a minimal cone of rotation; said device comprising: a fairing member constructed and arranged for rotational attachment to said mast member and substantially encasing the elongated body, said fairing member having a base end and a top end corresponding to said mast member and having a first fairing section and a second fairing section, said first fairing section extending from the base towards a point inside the minimum cone of rotation, said first fairing section having a symmetrical aerofoil cross-sectional shape with a projecting rounded forward face and a extending tapered back, said second fairing section extending from said first fairing section to the about the top end and having a cross-sectional shape a second forward face and a second back, said second forward face projecting no further than and substantially parallel to the minimum cone of rotation, and said second back extending no further than and substantially parallel to said minimum cone of rotation; such that said fairing member can be rotated a full rotation about said mast to assume one or more positions relative to a wind to provide aerodynamic lift and one or more positions in which the fairing member provides no aerodynamic lift.