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.

Typical 'jet ski' pump jet

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

Other websites

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

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