Abstract
The performance of a helicopter may be determined by methods similar to those used on conventional aircraft. Particular differences exist in evaluating vertical climb performance and establishing values of profile and parasite drag. Methods have been established to correlate power, gross weight, rotor speed, forward speed, altitude, and temperature by accounting for transmission efficiency, changes in profile drag with mean lift and Mach number, and parasite drag with speed. The resultant agreement with the original aerodynamic analysis falls within the accuracy of flight test measurement. Absolute values of efficiency, parasite and profile drags must be determined with torquemeters and full scale wind tunnel tests. Otherwise, relative values may be assigned each parameter to render satisfactory performance analysis.
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