| 摘要 |
An electric propulsion system includes a first tube fixedly secured to a hull of a boat and having an upper end adjacent an opening in a surface of the boat and a lower end adjacent an opening in the hull. A second tube is concentrically disposed in the first tube and is withdrawable from the first tube via the upper end. An electric drive motor is disposed within the second tube and is longitudinally movable therein between upper and lower positions. The drive motor has a rotatable output shaft coupled with a propulsion unit that is longitudinally movable with the drive motor between extended and retracted positions. When the drive motor is in the upper position, the propulsion unit is in a retracted position within the second tube. When the drive motor is in the lower position, the propulsion unit is disposed externally of the hull and the lower end of the first tube. The propulsion unit includes a blade assembly rotatably driven by the drive motor to provide propulsion.
|
