| 摘要 |
<p>A propulsion device (10) consisting of one or more hydrofoils (14) mounted on endless tracks (13) for movement non-rotationall through the water in a y direction orthogonal to the fore-and-aft axis -of the vessel. The hydrofoils (14) are presented to the water at an angle of attack (pi.tch) so as to provide thrust in the required direction of motion of the vessel.</p> |
