| 摘要 |
The boat has two parallel guide rails extending longitudinally along each side. A carriage mounted on rollers can be moved forwards and backwards along these rails. Each carriage carries a board mounted on a horizontal shaft projecting outwards at right angles to the rail. When the carriage is pushed in the forward direction, the board swings to a horizontal position and slides over the surface of the water. When the carriage is pushed in the rearward direction it is swung to a vertical position by the pressure of the water and propels the boat forwards. USE - A system of propelling and steeing a small boat.
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