General Electric T64

The General Electric T64 is a free-turbine turboshaft engine that was originally developed for helicopters and later also used on fixed-wing aircraft. General Electric introduced it in 1964. It has an all-axial compressor with fourteen stages and four rows of variable stators, which gives a high overall pressure ratio and, for its time, a low specific fuel consumption. Unlike the earlier T58, its two stage power turbine shaft runs coaxially with the high pressure shaft and delivers power to the front of the engine instead of the rear. Later versions produce from 3,925 to 4,750 shaft horsepower, and the engine was designed to accept different gearboxes or shaft drives for helicopter or turboprop service and to run continuously at steep angles for STOL and helicopter work.