| 摘要 |
Manually operable propulsion paddles, for use in water skiing or boating are provided with a lower water-engaging portion, an upwardly-extending shaft and a handle at the upper portion of the shaft. The water engaging portion comprises a pair of plates hingedly secured on a hinge pin mounted on the lower portion of the shaft. The plate members assume an open position when downward force is exerted on them, for propulsion through the water, and a closed position for easy withdrawal through the water.
|
