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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 - Wikipedia, the free encyclopedia”, en.wikipedia.org
In 1967, General Electric began work on a new turboshaft engine demonstrator designated the "GE12" in response to US Army interest in a next-generation utility helicopter. The CT7 turboprop variants use the same core as the turboshaft variants, with a propeller gearbox fitted forward of the core. — “General Electric T700 - Wikipedia, the free encyclopedia”, en.wikipedia.org