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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.
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 ...
Rotor of the impeller pump (cooling system) of an outboard motor. The most common type of cooling used on outboards of all eras use a rubber impeller to pump water from below the waterline up into the engine. This design has remained the standard due mainly to the efficiency and simplicity of its design.
Membrane pump on an oil tanker deck, to evacuate any leak down to the slops tanks. One of the firefighting pumps on the salvage tug Abeille Bourbon Electrical motors for ballast water pumps — on the oil tanker Algrave. A Marine pump is a pump which is used on board a vessel or an offshore platform.
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.
Essentially, it boasted a significantly slimmer pointed gear case that housed an integrated rubber rotex water pump and forward only 1:1 gears along with the necessary bearings. After a few months of use, Mercury found that the average race boat's transom would not elevate the standard driveshaft housing and quicksilver gear case high enough ...