sprag brake

sprag brake
A positive mechanical brake for locking the wheels of a helicopter parked in a confined space or on a rolling deck. Equivalent to a parking brake.

Aviation dictionary. 2014.

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  • sprag brake — A sprag is a stick (of wood or metal) which is inserted into gears or even into the dirt to stop the motion of something …   Dictionary of automotive terms

  • brake — [1] To slow down a vehicle. [2] The mechanism that converts motion (kinetic energy) into heat energy through friction. The most common instance is found in the wheels of cars where the brake shoes or disc pads are designed to press against the… …   Dictionary of automotive terms

  • sprag — (n.) prop in a mine, 1841, of unknown origin. Transferred by 1878 to wood blocks, etc., used to brake motor vehicles. As a verb, from 1841. Related: Spragged; spragging …   Etymology dictionary

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  • Sprag — A sprag is a one way freewheel clutch used in a number of applications. It resembles a roller bearing with rollers shaped like a figure eight and cocked with a spring. When the unit rotates in one direction, the rollers stand up and bind because… …   Wikipedia

  • sprag — noun 1》 a stout stick or bar inserted between the spokes of a wheel to act as a brake. 2》 a prop in a coal mine. Origin C19: of unknown origin …   English new terms dictionary

  • sprag — n. 1 a thick piece of wood or similar device used as a brake. 2 a support prop in a coal mine. Etymology: 19th c.: orig. unkn …   Useful english dictionary

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  • Semi-automatic transmission — Transmission types Manual Sequential manual Non synchronous Preselector Automatic Manumatic Semi automatic Electrohydraulic …   Wikipedia

  • Hydramatic — (also known as Hydra Matic) was an automatic transmission developed by both General Motors s Cadillac and Oldsmobile divisions. Introduced for the 1940 model year, the Hydramatic was the first fully automatic mass produced transmission developed… …   Wikipedia

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