A parameter-estimation algorithm was used to extract the longitudinal aerodynamic derivatives from flight data for the XC-142A airplane in a cruise condition. The flight data were the response to a tail-plane doublet input. Results of this study showed that a set of derivatives were determined which yielded a calculated aircraft response in close agreement with the measured response. This calculated response was in much closer agreement with the flight data than the response obtained by using derivatives which were calculated from empirical methods. There were large differences between some of the important derivatives extracted from flight data and those calculated from empirical methods. The reasons for these differences were not identified.


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    Title :

    Extraction of longitudinal aerodynamic coefficients from forward-flight conditions of a tilt-wing V/STOL airplane


    Contributors:

    Publication date :

    1972-12-01


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English


    Keywords :




    Forward Swept Tilt Wing V/STOL Aircraft

    SAE / American Helicopter Society / AIAA | British Library Conference Proceedings | 1997


    Forward Swept Tilt Wing V/STOL Aircraft

    SAE / American Helicopter Society / AIAA | British Library Conference Proceedings | 1997