| 摘要 |
The invention relates to a boat propeller having rotatably journalled blades in its hub to enable shifting between forward and reverse without reversing the direction of rotation. The hub is rotatably journalled on the propeller shaft and contains a transmission between the shaft and the blades. The transmission can be coupled between positions for forward, reverse and neutral. The invention uses the torque of the motor and the reaction moment of the water against the blades to achieve a relative rotation between the shaft and the hub, whereby the transmission turns the blades to one of two stops, which define the positions for forward or reverse. |
