| 摘要 |
PURPOSE:To aim at preventing cavitation from taking place and as well at enhancing the propelling performance, by providing such an arrangement that the stern section of a hull in the front of a main propeller is constricted forward, and a small single propeller for accelerating wakes rearward is laid along the center line of the hull. CONSTITUTION:The stern section of a hull in the front of a main propeller 2 is formed such that it is constricted forward above a main propeller 2 and therefore divided into two sections, a lower hull section 1b through which a main propeller shaft 5 is pierced and an upper hull section 1a above the lower hull section 1b. In the front of support members 7, 7 a small propeller 8 for accelerating wakes rearward is laid in the vicinity of the top end of the rotating circle 2a of the main propeller 2 along the center line of the hull, and is driven by a small propeller prime mover 10 through a shaft 9. With this arrangement, the hull section forward of the main propeller 2 is deeply constricted so that wakes may be reduced, and further the wakes are accelerated rearward by means of the small propeller 8, thereby the circumferential stream distribution in the main propeller rotating circle 2a is made uniform. |
