| 摘要 |
A propulsion device for propelling a floating watercraft comprises a flexible fluke (16) that is pivotal about a substantially horizontal fluke pivot axis, and means for transmitting an oscillatory motion about said fluke pivot axis to said fluke (16). The propulsion device (10) may be reconfigured between two or more modes or combinations of modes, for example - a manual power mode, in which a hand-lever is mechanically engaged with the fluke (16) for transmitting an oscillatory, propulsive motion to the fluke (16) by means of a reciprocating movement of the hand-lever; - a motor-powered mode, in which a motor is mechanically engaged with the fluke (16), and the motion of the hand-lever is isolated from any propulsive motion of the fluke (16) about said fluke pivot axis; - a forward mode, in which a main portion of the fluke (16) extends astern of the pivot axis (21); and - a reverse mode, in which a main portion of the fluke (16) extends afore of the fluke pivot axis (21). |
