| 摘要 |
<p>A planing hull of a water craft comprises side keels (2) and a centre keel (4). A downwardly open chamber (10) is defined rearwardly of the centre keel (4) and is flanked on either side by the side keels (2). The chamber (10) confines a cushion of air which supports the hull in the planing mode, air supply to the chamber (10) being wholly via the underside of the hull by being channelled between the keels (2, 4) without the use of air vents which open into the chamber (10). The absence of air vents provides improved drag at medium and low speeds.</p> |
