| 摘要 |
Presented is an improved marine vehicle propulsion system that utilizes a water accelerating rotor that operates efficiently when either partially or fully submerged all the while enclosed in a duct like a standard pump impeller pressurized nozzle waterjet. This new waterjet propulsor has a simple gas supply system without moving parts that supplies either gas or water to the water accelerating rotor dependent upon level of the waterline relative to the gas supply's inlet. One or more fluid inlet flow directing valve elements are offered that can vary the level of water reaching the rotor's inlet and can also, in an extended position, prevent water from impacting the waterjet's inlet. The latter item is valuable when the marine vehicle is either being towed or when it is being propelled by another propulsor as it reduces drag due to water flowing through an inoperative instant invention waterjet propulsor. Further, both ram or flush inlets may be used with the ram inlet being, at least in its majority, positioned above the marine vehicle forward of it. A multi-element flow reversing bucket system is also offered.
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