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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. The design also incorporates an intake to provide water to the pump and ...
A jetboat is a boat propelled by a jet of water ejected from the back of the craft. Unlike a powerboat or motorboat that uses an external propeller in the water below or behind the boat, a jetboat draws the water from under the boat through an intake and into a pump-jet inside the boat, before expelling it through a nozzle at the stern.
A pump-jet, hydrojet, water jet, or jet drive uses a ducted propeller (axial-flow pump), centrifugal pump, or mixed flow pump to create a jet of water for propulsion. These incorporate an intake for source water and a nozzle to direct its flow out, generating momentum, and in most cases, employing thrust vectoring to steer the craft.
By the mid 1960s Jacobson had quit his work in finance to pursue developing his jet ski concept full-time. The first prototype was up and running by 1965. This fixed-handlepole, stand-up design was constructed out of aluminum and powered by a West Bend two-stroke engine driving a Berkeley jet pump.
The idea of jet propulsion was not Rumsey's alone. Daniel Bernoulli (1700–1782) originated the idea of propelling watercraft in that way. In the summer of 1785, while Rumsey and his assistant Joseph Barnes were in the process of assembling his boat, Benjamin Franklin, on board a ship from France, wrote of propelling a boat by water jet. [5]
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