| 摘要 |
A water-borne craft includes a hull having a pair of wing-like foils positioned on the bottom of the hull toward the rear or stern portion of the craft and in equally spaced relation on opposite sides of the fore and aft center line or symmetry axis of the hull such that the foils are immersed in the water when in use. The foils are each arranged so as to be movable between a first position such that they meet the relatively moving water and generate a lifting force which reacts with the hull so as to lift the rear portion of the hull upwardly,and a second position wherein no lifting force is generated by the foil as, for example, during turning motion of the hull. By exerting the lifting force on the rear portion of the hull, the planing angle is reduced thus reducing hydrodynamic drag and allowing for an increase in speed. |
