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Typical 'jet ski' pump jet
Rear view of pump-jet on a Mark 50 torpedo

A pump-jet or more commonly a water jet is a marine system that creates a jet of water for propulsion. The mechanical arrangement may be a ducted propeller with nozzle, or a centrifugal pump and nozzle. The first functioning pump-jet engine was created by New Zealand inventor, Sir William Hamilton in 1954.

Contents

Advantages

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

Disadvantages

  • Can be less efficient than a propeller at low speed
  • More expensive
  • Higher weight in boat due to entrained water
  • Will not perform well if boat is heavier than the jet is sized for
  • Can become clogged with debris e.g. seaweed[2]

Sources

  1. ^ FAS Military Analysis Network: MK-48 Torpedo
  2. ^ http://www.grc.nasa.gov/WWW/K-12/airplane/aturbf.html

See also

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Simple English

' 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.

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