An Empirical Method for Calculating the Power Required Due to Compressibility on a Single Rotor Helicopter
Abstract:A flight test program was conducted to verify an empirical method developed for calculating the power required due to compressibility on the UH‐1F helicopter. The increase in power required dus to compressibility determined by the method was found to be a function of the difference between the advancing blade tip Mach number and the critical Mach number for the airfoil section. The method used an empirical factor to determine the critical Mach number instead of a theoretical computation of the drag divergence Mach number as used in previous methods.
Document Type: Research Article
Publication date: 1965-07-01
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