| 摘要 |
A boat propulsion system includes a boat having an elongated hull (154) with a water flow channel (156A,156B) formed in the bottom thereof, wherein movable trim plate or plates (178A, 178B) is disposed within the water flow channel for controlling a flow of water to a surface-piercing propeller (176) which is positioned aft of the water flow channel (156A, 156B) and which is disposed within a propeller cavity (170) formed in the bottom of the hull, and extending upwardly into the hull bottom a greater amount than the deepest portion of the channel. In a fully extended position, the trim plate(s) (178A, 178B) is/are flush with the hull of the boat, and in fully recessed position the trim plate(s) is/are completely recessed within the water flow channel (156A, 156B). The trim plate(s) (178A, 178B) is/are variably movable between the recessed and fully extended positions. This is stated to provide for performance advantages at various boat speeds.
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