| 摘要 |
The float tube paddle fin 1 includes a web 2 which has two edge-supporting rib sleeves 3 and a central fold-supporting rib sleeve 4, encapsulating ribs 5. There is an arch strap 6 sewn onto the width of the leading edge of web 2, with free ends extending outward from web 2. Attached at the juncture of the leading edge of the web 2 and the free ends of arch strap 6 is ankle strap 7 which has an adjustment buckle 7 at one free end. Also attached to outer tube sleeves 3, at intermediate points 9, is a heel strap 10, which has an adjustment buckle 8 at one free end. The trailing edge of web 2 is hemmed to seal the supporting rib sleeves 3 and 4. Ankle strap 7 and heel strap 10 bridge the web 2, and to support the web 2 so as to fit snugly against the arch of the foot of the floatstrider, and to trail easily through the water in a "V," like closed butterfly wings, as the foot strides forward, on dry land, on river bottom, or through deep water. However, as the floatstrider's foot moves backward, water pressure against the edges of web 2 opens the "V" and rotates the web 2 downward to exert maximum force forward and to propel the floatstrider and the float tube forward.
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