United States Patent Specifications

In an airplane propeller construction, a propeller blade comprising a propeller body having the general shape and contour of the desired propeller aerofoil, a layer of metallic surface material extending over the surface of said blade from the hub end thereof, said surface material being mechanically bonded to said blade throughout the area of the blade covered thereby, and one or more conduits formed within said layer of material to convey anti‐icing‐liquid along said blade.