High efficiency propeller

A high efficiency propeller which provides added surface contact with a propellant medium, namely water or air, which is prevented from slipping off of the ends of the propeller, thereby increasing the efficiency of the propelling force of a propeller, the device comprising, in combination:

• conventional propeller blades;
• a series of flanges integrally formed with the outside surface of the propeller blades, consisting of an inside surface integrally conjoined with the rear surface of said propeller blades, an outside surface, opposed side surfaces, and opposed end surfaces, with a series of flanges spaced apart in line laterally across the width of said rear surface and between said side surfaces respectively and longitudinally in line on said rear surface between said outside surface and the hub of a propeller, with further a round through hole provided in each flange running axially between said end surfaces and disposed approximately centrally therethrough;
• and
• a series of foldable fins constructed of the same material as said propeller blades and consisting of a flat bottom surface rounded on one of its ends and blunt on the opposite end, semi-curved side surfaces, and a narrow top surface interconnecting on each end the opposed end surfaces with said top surface being tapered downwardly as it extends from the leading edge of a propeller blade to the trailing edge of a propeller blade, with each of said foldable fins further provided with a round through hole extending axially between said end surfaces and disposed near said rounded edge, and with each of said foldable fins being further provided with a rectangular groove disposed centrally along its bottom surface and provided with dimensions to fit over said flanges so that said round through hole in said foldable fins axially line up with said round through hole in said flanges with said foldable fins and
• said flanges connected thereby in a pivotal manner by means of a pin.