| 摘要 |
The subject apparatus comprises a pair of floats, each having propulsion apparatus attached to its bottom. There is a foot well in each float, extending from top to bottom and fitted with toe retaining and heel support elements. The propulsion apparatus comprises an I-beam having a top flange, web and bottom flange and pairs of flaps hinged to the web, one of each pair on each side of the web. The pairs are spaced equidistant from each other along the web. The hinge axes are vertical. Each flap hinges between the closed position (against the web) to the open position (about 90 DEG to the web). The longitudinal axis of the I-beam is parallel to the longitudinal axis of the float to which it is attached and the web functions as a keel. The bottom flange is angled slightly upward toward the front end. The midpoints of the lengths of the foot wells and propulsion apparatus are somewhat aft of the lengthwise midpoints of the floats. The propulsion apparatus is about half as long as the float.
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