Patent ID: 6168384
Filing Date: 2001-01-02
Classification: B63H,B64C,F04D,Y02T,Y10S

Abstract:
A propeller configuration, comprising: a rotatable hub defining an axis of rotation; at least two blade structures attached to said hub substantially perpendicular to said axis of rotation; each of said blade structures having a leading edge, a trailing edge spaced from said leading edge, a forward surface extending from said leading edge to said trailing edge, and a rear surface extending from said leading edge to said trailing edge; said forward surface at said leading edge extending substantially parallel to and offset from said forward surface at said trailing edge, and said rear surface at said leading edge extending substantially parallel to and offset from said rear surface at said trailing edge; wherein an offset between said forward surface at said leading edge and said forward surface at said trailing edge is less than a distance between said leading and trailing edges; and said forward surface and said rear surface converging at said leading edge to form a sharp leading edge and converging at said trailing edge to form a sharp trailing edge.