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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.
Fluid flow in an external gear pump. A hydraulic pump is a mechanical source of power that converts mechanical power into hydraulic energy (hydrostatic energy i.e. flow, pressure). Hydraulic pumps are used in hydraulic drive systems and can be hydrostatic or hydrodynamic. They generate flow with enough power to overcome pressure induced by a ...
The control panel for the Minneapolis-Honeywell C-1 gyroscopic autopilot, used on B-24 bombers. The gyroscopic autopilot was a type of autopilot system developed primarily for aviation uses in the early 20th century. Since then, the principles of this autopilot has been the basis of many different aircraft control systems, both military and ...
In 1930, the Royal Aircraft Establishment in the United Kingdom developed an autopilot called a pilots' assister that used a pneumatically spun gyroscope to move the flight controls. [6] The autopilot was further developed, to include, for example, improved control algorithms and hydraulic servomechanisms.
Jet Ferry One: P&O Jet Ferries: Sep 1979: 1982 Funchal: Far East Hydrofoil / TurboJET Hong Kong: Active No. 14 HMS Speedy (P296) Royal Navy Jan 1979 1982 Speedy Princess - Lilau Far East Hydrofoil / TurboJET Hong Kong Scrapped in 2021 (Retired in 2019) No. 15: Cú Na Mara: B&I Line: 1980: 1982 Ginga: Sado Steam Ship: Active No. 16: Jet Ferry ...
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.
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