초록 ▼

The bottom surface of the surfboard has a set of transverse ridges which are bowed away from the front of the surfboard, which are symmetrical relative to the longitudinal axis of the board. A channel extends across the edge surface of these ridges and are aligned along the board longitudinal axis.

The bottom surface of the surfboard has a set of transverse ridges which are bowed away from the front of the surfboard, which are symmetrical relative to the longitudinal axis of the board. A channel extends across the edge surface of these ridges and are aligned along the board longitudinal axis. In motion, the moving water not only strikes the rear edge face of the surfboard but also the rear faces of each ridge, thereby increasing its propelling efficiency relative to surfboards devoid of such ridges. A second and a third sets of transverse ridges may be formed in water pockets made on opposite lateral side surfaces of the surfboard. These second and third ridge pockets assist in self-straightening the surfboard should the latter accidentally swerve at least slightly transversely from the general axial direction of displacement.

대표청구항 ▼

[ I claim:] [1.] A surfboard comprising an elongated buoyant body having top, bottom, and opposite one and another lateral side surfaces, a longitudinal axis and a front and rear end, said body having a first set of arcuate transverse ridges formed by cavities made in said bottom surface, said ridge

[ I claim:] [1.] A surfboard comprising an elongated buoyant body having top, bottom, and opposite one and another lateral side surfaces, a longitudinal axis and a front and rear end, said body having a first set of arcuate transverse ridges formed by cavities made in said bottom surface, said ridges including a frontmost ridge, a rearmost ridge and intervening ridges, all of said ridges being frontwardly convex, symmetrical relative to said longitudinal axis and spaced one from the other longitudinally of said body, said ridges each having a frontmost leading face;characterized in that each one of said intervening ridges is formed with a transverse channel extending across said frontmost leading face, said channels being coextensively aligned along said longitudinal axis;each successive pair of said cavities opening in liquid communication with each other through said transverse channel of the corresponding adjacent one of said intervening ridges, said frontmost ridge closing the front end of the frontmost one of said cavities and said rearmost ridge closing the rear end of the rearmost one of said cavities;wherein said channels remain fully submerged below the water line in use of the board over a body of water.