Engineering
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Typical 'jet ski' pump jet

A pump-jet or water jet is a marine system that creates a jet of water for propulsion.

Design[]

The mechanical arrangement may be a ducted propeller with nozzle, or a centrifugal pump and nozzle. The jet can reach a speed up to 68 km/h

History[]

The first functioning pump-jet engine was created by New Zealand inventor, Bill Hamilton (engineer), as early as in 1954.

Advantages[]

Pump jets have some advantages over bare propellers for certain applications, usually related to requirements for high-speed or shallow-draft operations, etc. These include:

  • Increasing the speed before the onset of cavitation, due to the raised internal dynamic pressure

See also[]

http://en.wikipedia.org/wiki/Bill_Hamilton_%28engineer%29


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