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MERIT DEVELOPED PARAMETERS FROM STATIC TRANSONIC, MODEL TESTS



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AWS FIGURE OF MERIT FOM DEVELOPED PARAMETERS FROM STATIC TRANSONIC MODEL TESTS by John E Lamar Francis J Capone and Robert M Hall NASA Langley Research Center Hampton VA 23681 NOMENCLATURE ABSTRACT This paper provides an approach to answer the question of whether one can rely solely on static data taken during a transonic model test to provide the certainty needed that a new aircraft will or will not have Abrupt Wing Stall AWS events during its flight operations By comparing traditional and alternate static Figures of Merit FOMs with the Free To Roll FTR response data a rational basis for assessing the merits of using standard testing techniques for the prediction of AWS events has been established Using the FTR response data as a standard since these results compare well with flight the conclusion from this study is that neither traditional nor alternate FOMs can be trusted to provide an indication as to whether a configuration will or will not have AWS tendencies Even though these FOMs may flag features which have a high degree of correlation with the FTR response data there are as many or more of these FOM flagged features which do not correlate Thus one needs to use the FTR rig to assess AWS tendencies on new configurations Ail AFOM AWS A1 A2 A3 CL CL Cl Cl rms Cl CN CN rms CWRBM CWRBM rms FCL FOM FTR ISE LE LEF LERX Aerospace Engineer Configuration Aerodynamics Branch Associate Fellow AIAA Aerospace Engineer Configuration Aerodynamics Branch This material is declared a work of the U S Government and is not subject to copyright protection in the United States LEX M N A rms Rn Aileron deflection angle positive down Alternate FOM Abrupt Wing Stall Coefficients in FOM 3 Lift coefficient Lift curve slope Rolling moment coefficient root mean square of the Cl Dihedral effect Normal force coefficient root mean square of the CN Wing root bending moment coefficient root mean square of the CWRBM Flight Control Law used with the F A 18E F aircraft Figure Of Merit Free To



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