Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A pump-jet, hydrojet, or 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 man-made pump-jet engine was created by New Zealand inventor Sir William Hamilton in 1954. In the Ordovician period the first known cephalopods swam by a natural built-in reciprocating hydrojet. Pump jets have some advantages over bare propellers for certain applications, usually relate to requirements for high-speed or shallow-draft operations. These include: Increasing the speed before the onset of cavitation, because of the raised internal dynamic pressure; High power density (with respect to volume) of both the propulsor and the prime mover (because a smaller, higher-speed unit can be used).

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