Patent ID: 7294036
Filing Date: 2007-11-13
Classification: A63H

Abstract:
1. A circular planform wing having a structure comprising: a contiguous thin central plate having top and bottom surfaces; an outer annular rim encompassing the central plate; the rim having a lower edge defining a lower plane of the wing, and the central plate having an upper zone defining an upper plane of the wing; the rim having a cross-section with a lower corner forming the lower edge, an outer rounded corner, and an upper corner merging with the central plate, the outer corner being located between the upper plane and the lower plane; and the rim cross-section having a convex upper curve joining the outer rounded corner to the upper corner, the rim cross-section having an inside rim surface joining the lower corner to the upper corner, and the lower corner comprising a lower curve from a first point comprising the lower edge of the rim to a second point where the lower corner merges with the inside rim surface, the radius of curvature of the lower curve decreasing from the first point to the second point.