The blade (10) for a propeller constituted by a hub (20) to which the feet (12) are fixed has a leading edge (14) and a trailing edge (15) which is formed by two arcs (152, 153) having respective mean radii of curvature (.rho.2, .rho.3) which are different and interconnected without an angular point....http://www.google.es/patents/US4871298?utm_source=gb-gplus-sharePatente US4871298 - Falciform blade for a propeller and its application in particular in motorized fans for automobiles
Falciform blade for a propeller and its application in particular in ...
