Aerodynamic toy

An aerodynamic toy comprising a rotatable free-flight body of generally circular configuration comprising a main body portion having a generally convex upper surface and a generally concave bottom surface, a downwardly extending rim portion integral with said main body portion and defining the circumferential perimeter of the aerodynamic toy which acts in flight as a primary air foil, said rim portion having an outside surface which curves downwardly and somewhat inwardly and at least one spiral-shaped air spoiler on said convex upper surface extending outwardly from centrally of the aerodynamic toy, said at least one spiral-shaped air spoiler being defined by an involute of a predetermined fixed curve located centrally of the aerodynamic toy.