| 摘要 |
Boat Drive System comprising as an integral unit, a propeller, propeller driving shaft with suitable bearings and seals, a duct having an inlet and outlet end oriented essentially parallel to the longitudinal axis of the boat within which said propeller rotates in a plane essentially normal to the longitudinal axis of the duct, and steering and reversing vanes within the discharge end of such duct. Said boat drive incorporates prior art ducted fan principal to improve efficiency, performance, safety, and reduce cost of boat drive systems available principally for pleasure craft.
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