Importance

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Abstract

A surfboard has one or more (e.g. three) fins extending from its bottom surface. Each fin is a rigid plastic body element (e.g. Shore D hardness of at least about 78) with curved leading and trailing edges, a base, and side walls. The edges intersect in a rounded tip, and the leading edge curves back toward the rear of the surfboard. The leading and trailing edges, but not the sides, of the fin rigid bodies are covered with a soft flexible material (e.g Shore A hardness of about 40-100), such as rubber, urethane, or silicone. The flexible elastomeric material has sufficient thickness, softness, and flexibility to protect a surfer impacted by a leading or trailing edge of the fin, and to act as a rudder (provide anti-cavitation action) to provide some board steerability by the surfer shifting his or her weight.

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First Claim