| 摘要 |
<p>The present invention relates to twin-propeller ship using overlapping propellers and addresses the prevention of the erosion of the rearward propeller due to tip vortex cavitation created by the forward propeller. A propulsion device for a ship is provided with: a port propeller (120); and a starboard propeller (110) provided forward or rearward of the port propeller (120) in the longitudinal direction of the ship in such a manner that portions of the blades (115) of the starboard propeller (110) overlap with the blades (125) of the port propeller (120). Among the port propeller (120) and the starboard propeller (110), the forwardly located forward propeller (120) has a blade shape which is less likely to create tip vortex cavitation than the rearwardly located rearward propeller (110).</p> |
