A turboshaft engine is a form of gas turbine which is optimized to produce shaft power, rather than jet thrust. In principle, a turboshaft engine is similar to a turbojet, with additional turbine expansion to extract heat energy from the exhaust and convert it into output shaft power.
Turboshaft engines are commonly used in applications which require a sustained high power output, high reliability, small size, and light weight. These include helicopters, auxiliary power units, boats and ships, tanks, hovercraft, and stationary equipment.
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