Water jet propulsion unit for use in a jet boat

Details Water jet propulsion unit for use in a jet boat Water jet propulsion unit for use in a jet boat

B - Operations, Transporting

63

H

B63H 11/08 (2006.01) B63H 5/10 (2006.01)

Patent

CA 2146983

A water jet propulsion unit intended for use in jet boats, the unit comprising an intake section (10), a pump section (12) and a nozzle section (16). In the pump section (12) there are two counter- rotating impellers (14, 15) on concentric counter-rotating shafts (26, 27) calibrated so that any radial flow created in the upstream impeller (14) is converted into axial flow by the down- stream impeller (15). In one embodiment the nozzle section (16) has a throttled outlet (17) to allow for a high mass/low pressure operation while maintaining pump priming. There are no support structures or stators downstream of the intake section ( 10) in the preferred embodiment.

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