| 摘要 |
There is provided herewith a marine propulsion unit which is designed for intensifying or increasing the thrust obtained by an impeller such as a propeller for standard, outboard or inboard/outboard marine propulsion systems. The unit design incorporates an axial flow or screw type impeller operating within a housing which terminates in an area of reduced cross-section which augments or intensifies the thrust delivered by the impeller. The impeller blades virtually abut the inner circumference and fill the cross-sectional area of the housing near the inlet port.
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