![]() ![]() Another advantage is that when faring backwards by using the reversing bucket, steering is not inverted, as opposed to propeller-powered ships.Īn axial-flow waterjet's pressure is increased by diffusing the flow as it passes through the impeller blades and stator vanes. This provides pumpjet-powered ships with superior agility at sea. In a way, this is similar to the principles of air thrust vectoring, a technique which has long been used in launch vehicles (rockets and missiles) then later in military jet-powered aircraft. Plates, similar to rudders, can be attached to the nozzle in order to redirect the water flow port and starboard. ![]() The nozzle also provides the steering of the pump-jets. This feature is the main reason pump jets are so maneuverable. The reversing bucket can also be used to help slow the ship down when braking. With the use of a reversing bucket, reverse thrust can also be achieved for faring backwards, quickly and without the need to change gear or adjust engine thrust. The water pressure inside the inlet is increased by the pump and forced backwards through a nozzle. The pump can be of a centrifugal design for high speeds, or an axial flow pump for low to medium speeds. Water enters the pump through this inlet. ![]() 1: Forward thrust, reversing bucket disengaged 2: Reverse thrust, reversing bucket pushes the thrust flow backwards Forward, back, side and turn by pump-jetĪ pump-jet works by having an intake (usually at the bottom of the hull) that allows water to pass underneath the vessel into the engines. Design This image illustrates the workings of a reversing bucket. The design also incorporates an intake to provide water to the pump and a nozzle to direct the flow of water out of the pump. 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. JSTOR ( February 2013) ( Learn how and when to remove this template message)Ī view of pump-jets operating Two of four KaMeWa waterjets on the high-speed ferry Discovery Typical jet ski pump jetĪ pump-jet, hydrojet, or water jet is a marine system that produces a jet of water for propulsion.Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification. ![]()
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