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A pump-jet, hydrojet, or water jet is a marine system that produces a jet of water for propulsion. The mechanical arrangement may be a ducted propeller ( axial-flow pump ), a centrifugal pump , or a mixed flow pump which is a combination of both centrifugal and axial designs.
The water forced through the impeller is channeled by the housing, creating a water jet that propels the vessel forward. The housing is normally tapered into a nozzle to increase the speed of the water, which also creates a Venturi effect in which low pressure behind the impeller pulls more water towards the blades, tending to increase the speed.
The Kamewa waterjets are still traded by Kongsberg Maritime under that name and are offered in five product lines in two product series.. Previous products from Kamewa has been the A-series, a mix flow pump in aluminum, the SII and P62 pumps in stainless steel and the Kamewa Advanced Propulsion Systems (APS) Waterjet developed specifically for the Volvo Penta diesel engine.
Pump-jet – Marine propulsion system; Personal watercraft – Recreational watercraft that uses an inboard engine powering a pump-jet with an impeller; Wetbike – Brand of personal watercraft; Kitchen rudder – Type of directional propulsion system for vessels; Water rocket – Type of model rocket using water as its reaction mass
Centrifugal pumps with an internal suction stage such as water-jet pumps or side-channel pumps are also classified as self-priming pumps. [10] Self-Priming centrifugal pumps were invented in 1935. One of the first companies to market a self-priming centrifugal pump was American Marsh in 1938.
Rotor of the impeller pump (cooling system) of an outboard motor. The most common type of cooling used on outboards of all eras use a rubber impeller to pump water from below the waterline up into the engine. This design has remained the standard due mainly to the efficiency and simplicity of its design.