Presented is a new waterjet propulsor that is primarily intended for application to marine vehicles such as boats or ships having significant underwater hull portions, boats having underwater hull portions that support above water hulls by means of struts or the like, submarines, torpedoes, or the like but with particular application to large vessels. These can include versions of air cushioned craft and hydrofoils. The water flowing over underwater hull portions forward of the waterjet's inlet, in the preferred embodiment of the instant invention, extends around a majority of a periphery of the underwater hull portion. Special shapes for these underwater hull portions as well as air and boundary layer fences are employed. The absorption of hull boundary layer water results in enhanced efficiency for the waterjet propulsor. Use of external housing shapes on the waterjet propulsor that angle inward going aft from the waterjet inlet results in a forward thrust component on such housings.
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