Turboshafts are an adaptation of gas turbine technology in which the principle output is shaft power from the expansion of hot gas through the turbine, rather than thrust from the exhaust of these gases. ... As a variation of the gas turbine, turboshafts are very similar to turbojets.

How does a free power turbine work?

A free-turbine turboshaft ingests air through an intake. ... The compressor and its turbine are connected by a common shaft which, together with the combustor, is known as a gas generator, which is modeled using the Brayton Cycle. The (free) power turbine is on a separate shaft.

How does the turboprop engine work?

Turboprop, also called P Jet, hybrid engine that provides jet thrust and also drives a propeller. It is basically similar to a turbojet except that an added turbine, rearward of the combustion chamber, works through a shaft and speed-reducing gears to turn a propeller at the front of the engine.