| 摘要 |
PCT No. PCT/CA97/00034 Sec. 371 Date Jul. 13, 1998 Sec. 102(e) Date Jul. 13, 1998 PCT Filed Jan. 17, 1997 PCT Pub. No. WO97/27100 PCT Pub. Date Jul. 31, 1997The 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. |
