An analysis of fixed- and free-turbine -engines applicable to hell-copter propulsion was made at the NACA Lewis laboratory. Generalized performance charts are presented for these engines; and comparisons are made of off-design specific fuel consumption, altitude performance, power-speed characteristics, and response times. Calculations are made for the flight performance of an assumed 30,000-pound helicopter powered by the fixed- and free-turbine engines.nComponents for the fixed- and free-turbine engines are so chosen that the design-point specific power outputs and fuel consumptions are identical.
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