A circular planform wing includes a contiguous thin central plate having top and bottom surfaces. An outer annular rim encompasses the central plate. The rim has a lower edge defining a lower plane of the wing, and the central plate has an upper zone defining an upper plane of the wing. The rim has a cross-section with a lower rounded 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. The rim cross-section has a convex upper curve joining the outer rounded corner to the upper corner, an inside rim surface joining the lower rounded corner to the upper corner, and a convex lower curve joining the outer rounded corner to the lower rounded corner.