| 摘要 |
<p>A propulsion system of displacement or semi-displacement ships, comprising one or more propellers of semi-submerged type, arranged with a partial immersion of the sole bottom blades and with the top blades emerged, regardless of the state of motion and the trim of the craft, allows, employed power being equal, a higher propulsion efficiency and allows to keep the driveline of the propellers entirely above water level, wherein said semi-submerged propellers are arranged at the transom, the ratio of diameter (D) or sum of diameters (NpxD) of the semi-submerged propellers to craft width (L) at the water line (3) is greater than 0.50.</p> |
