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A pump-jet, hydrojet, or water jet is a marine system that produces a jet of water for propulsion. The mechanical arrangement may be a ducted propeller ( axial-flow pump ), a centrifugal pump , or a mixed flow pump which is a combination of both centrifugal and axial designs.
Jet drives are inefficient in low speed vessels, but may have other advantages that make them suitable for a given application. Internal drive propulsion was originally designed by Sir William Hamilton (who invented the waterjet in 1954) for operation in the fast-flowing and shallow rivers of New Zealand, specifically to overcome the problem of ...
When the jet ski and the floating rider move with the water, the 20+ meter long hose can hang up on underwater obstructions. This can pull the rider, and potentially the jet ski under water as the hose becomes taut. Deaths have occurred in this manner and hydroflight in moving water is strongly recommended against.
Marine propulsion is the mechanism or system used to generate thrust to move a watercraft through water. While paddles and sails are still used on some smaller boats , most modern ships are propelled by mechanical systems consisting of an electric motor or internal combustion engine driving a propeller , or less frequently, in pump-jets , an ...
The USV is 15 m in length, 4.8 m wide, 1.8 m in draft, and has a displacement of about 20 tons. It has a range of 500 nautical miles and can achieve a maximum speed of 42 knots. Its propulsion consists of a single pump-jet. [2] The hull is a trimaran design. [1]
Propulsion: 3 water jet propulsion engines producing 11,238 hp: Speed: 35+ knots [1] Range: ... Download as PDF; Printable version; In other projects Wikidata item
A water jet, or pump-jet, is a marine propulsion system that uses a jet of water. The mechanical arrangement may be a ducted propeller with nozzle, or a centrifugal compressor and nozzle. The pump-jet must be driven by a separate engine such as a Diesel or gas turbine. A pump jet schematic.
Water jet (propulsion) Add languages. Add links. Article; Talk; ... Download QR code; Print/export Download as PDF; Printable version; In other projects