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>A Comparison of Two Methods of Calculating Wing Loading with Allowance for Compressibility Note on Falkner's Method for Calculating Compressibility Effects on Wing Loading
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A Comparison of Two Methods of Calculating Wing Loading with Allowance for Compressibility Note on Falkner's Method for Calculating Compressibility Effects on Wing Loading
The report gives the results of a comparison by two different methods of the aerodynamic loading of a tapered V wing of aspect ratio 5-8 and 45 deg sweepback at M = 0-8, based on the Prandtl-Glauert factor or linear perturbation theory;the first method, associated particularly with vortex-lattice theory, deals with changes in Mach number by preserving the plan of the wing and using special Tables of downwash, while the second uses the solution for Mach number 0 on a wing with the lateral dimensions reduced by a specified factor.nThe two methods are shown to be in good general agreement at M. = 0-8 and, although it can be argued that the second method is more accurate on theoretical grounds, this is offset by the fact that the first has considerable advantages in ease of calculation, and in the possibility of extension to more accurate solutions when the Prandtl-Glauert factor fails at high subsonic speeds.
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