![]() ![]() The picture opposite shows where water enters the jet unit via the Intake (A). Water enters the jet unit intake on the bottom of the boat, at boat speed, and is accelerated through the jet unit and discharged through the transom at a high velocity. In a boat hull the jet unit is mounted inboard in the aft section. Put simply, the discharge of a high velocity jet stream generates a reaction force in the opposite direction, which is transferred through the body of the jet unit to the craft's hull, propelling it forward (see diagram below). A good example of this is the recoil felt on the shoulder when firing a rifle, or the thrust felt when holding a powerful fire hose. It works in relation to Newton's Third Law of Motion - "every action has an equal and opposite reaction". Here is a fuller explanation from the Hamilton Jet Site:Ī waterjet generates propulsive thrust from the reaction created when water is forced in a rearward direction. As water is expelled backward, the boat moves forward (think of how a rocket works.) Click to expand.A Jet Drive uses an impeller in a tube which sucks in water from the bottom and shoots it out a nozzel at the stern at a high rate of speed.
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