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For the brake actuation method commonly used in vehicles, see hydraulic brake. This article does not cite any references or sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (November 2009) Schematic water brake on a dynamometer A water brake is a type of fluid coupling used to absorb mechanical energy and usually consists of a turbine or propeller mounted in an enclosure filled with water. As the turbine or propeller turns, mechanical energy is transferred to the water due to turbulence and friction. In this process, the water heats up (to boiling point). The amount of resistance can be varied by changing the amount of water in the enclosure. Water brakes are commonly used on some forms of dynamometer. Hydrokinetic Construction (torque absorption) The Froude waterbrake is based on hydrokinetic construction or (torque absorption). The machine consists of an impeller (rotor) which accelerates water outwards by its rotation. The water has its velocity changed by a stator which causes the water to be returned to the inner diameter of the rotor. For given mass of water, this velocity change yields a corresponding momentum change – and the rate of change of momentum is proportional to a force. This force acting at some point within the rotor and stator is a distance from the shaft centerline, and a force multiplied by a distance produces torque. See also Torque converter Wikimedia Commons has media related to: Dynamometers This vehicle-related article is a stub. You can help Wikipedia by expanding it. v • d • e