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An Empirical Method for Calculating the Power Required Due to Compressibility on a Single Rotor Helicopter

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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.
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Document Type: Research Article

Publication date: 1965-07-01

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  • The Journal of the American Helicopter Society is the world's only scientific journal dedicated to vertical flight technology. It is a peer-reviewed technical journal published quarterly by AHS International and presents innovative papers covering the state-of-the-art in all disciplines of rotorcraft design, research and development. (Please note that AHS members receive significant discounts on articles and subscriptions.)

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