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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 ...
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 impeller.
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 third modification was as a transport for PBRs (patrol boat, river) from repair stations at Da Nang (YR-71) and Tan My (PBR Mobile Base 1) to outlying points at Cua Viet, and the Cua Dai rivers. PBR main propulsion jet pumps were easily damaged by ocean salt water which necessitated the boats being carried by another craft to their duty ...
Hydraulic pumps can also be used to start some engines through gears. The pumps are electrically controlled on the ground. A variation of this is the APU installed in a Boeing F/A-18 Hornet; it is started by a hydraulic motor, which itself receives energy stored in an accumulator.
The Casel autopilot, which included an array of green, red and white telltale control lights, used an electric motor to act on the main rudder. Though its basic principle was sound and was useful in some sections of the passage, it proved to be somewhat too lightly built for a wet vibrating little boat and was trouble ridden.
The truck was racing two airplanes at the Battle Creek Field of Flight Air Show and Balloon Festival in Michigan on Saturday when it crashed. The driver, Chris Darnell, 40, of Springfield ...
LARC-Vs were used by the Argentine Marines during the 1982 invasion of the Falkland Islands. In January 2011, during the 2010–11 Queensland floods in Australia , it was reported that C-17 aircraft of the Royal Australian Air Force were to carry two LARC-V vehicles for use in Operation Flood Assist.
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