US Patent 7637791 Fin for oscillating foil propulsion system
Patent 7637791 was granted and assigned to Hobie Cat Company on December, 2009 by the United States Patent and Trademark Office.
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A human propelled watercraft having a pair of flexible fins extending into the water each adapted to oscillate through an arcurate path in a generally transverse direction with respect to the central longitudinal dimension of said watercraft. Pedals are provided for applying input force whereby as input force is applied, the flexible fins can twist to form an angle of attack for providing forward thrust with respect to the longitudinal dimension of the watercraft while moving in both directions along the arcurate path. Each of the fins preferably have a generally squared off top and an outer area of harder rubber than the inner area. Preferably, each of the fins is provided with adjustable tensioning at the trailing edge.
US Patent 07637791 Fin for oscillating foil propulsion system US Patent 7637791 Fin for oscillating foil propulsion system
US Patent 07637791 Fin for oscillating foil propulsion system
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