Patent attributes
Disclosed is a propeller having at least first and second blade assemblies located one above the other. Each of the blade assemblies has a plurality of blades that extend radially outward from a shaft. The shaft can be coupled to a suitable land, sea or air vehicle (e.g., a ship). The blades of the first blade assembly lie above and alternate out of phase with the blades of the second blade assembly. Each of the blades of the first and second blade assemblies slopes downwardly relative to the shaft such that the leading sides thereof are located lower along the shaft than the opposite trailing sides. The blades of the first blade assembly are aligned with respective ones of the blades of the second blade assembly to establish substantially continuous and long downwardly sloping surface areas capable of maximizing the propulsion force generated by the propeller.
