Turboprop engines are a type of aircraft powerplant that use a gas turbine to drive a propeller. The gas turbine's designed specifically for this application, with almost all of its output being used to drive the propeller. The engine's exhaust gases contain little energy compared to a jet engine and play a minor role in the propulsion of the aircraft. The propeller's coupled to the turbine through a reduction gear that converts the high RPM, low torque output to low RPM, high torque. The prop… (More on Turboprop)