公开(公告)号：US5078632A

公开(公告)日：1992-01-07

申请号：US569143

申请日：1990-08-17

申请人： Toshimitsu Ogawa ,  Shouichi Takahara ,  Hideo Tahara

发明人： Toshimitsu Ogawa ,  Shouichi Takahara ,  Hideo Tahara

IPC分类号： B63H1/28 ,  B63H1/26 ,  B63H5/10 ,  B63H21/32

CPC分类号： B63H20/245 ,  B63H2005/103

摘要： To reduce engine exhaust gas pressure behind a motorboat propeller formed with a boss for educing engine exhaust gas therethrough, without forming a trumpet-shaped boss end and without allowing exhaust gas to flow upstream along the boss outer surface, a single or plural small subblades are provided between two adjacent large main blades at such a position that a positive pressure domain produced by the subblade reduces a negative pressure domain produced by the main blade. Since engine exhaust gas can be effectively educed, engine power increases and therefore motorboat acceleration performance can be improved.

摘要翻译： 为了减少形成有用于通过其引导废气的凸台的摩托艇螺旋桨后面的发动机排气压力，而不形成喇叭形凸台端，并且不允许废气沿着凸台外表面向上游流动，单个或多个小的子叶片 设置在两个相邻的大主叶片之间，使得由下刀片产生的正压力域降低由主叶片产生的负压域。 由于可以有效地引导发动机废气，所以发动机功率增加，因此可以提高摩托艇加速性能。