Pump-jet

Typical 'jet ski' pump jet

A pump-jet or water jet is a marine system that creates a jet of water for propulsion. The mechanical arrangement may be a propeller with nozzle, or a centrifugal pump and nozzle.

Pump jets have some advantages over bare propellers for certain applications, usually related to requirements for high-speed.

Pump-jet Media

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  A view of pump-jets operating

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  Two of four KaMeWa waterjets on the high-speed ferry Discovery

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  Typical jet ski pump jet

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  This image illustrates the workings of a reversing bucket. 1: Forward thrust, reversing bucket disengaged 2: Reverse thrust, reversing bucket pushes the thrust flow backwards

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  Forward, back, side and turn by pump-jet

Other websites

• Personal Watercraft Industry Association
• American Watercraft Association Archived 2008-08-28 at the Wayback Machine
• U.S. Coast Guard Boating Safety