| 摘要 |
A propulsion apparatus for coupling to the stern of a boat is provided having at least one afterplane attached to the stern. At least one motor is positioned onto each corresponding afterplane, where each motor has a propeller positioned above the top surface of the afterplane, such that the propeller does not extend substantially beyond the peripheral boundaries of the afterplane to protect the propeller. Each afterplane may be pivotally raised or lowered so that during operation of the motor, the axis of the propellers are parallel with the plane of the water for propelling the boat. The afterplanes may also be pivotally raised or lowered for planing the boat.
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