The scaled flutter model was a 1/6.5-size, semispan version of a supercritical wing (SCW) proposed for an executive-jet-transport airplane. The model was tested cantilever-mounted with a normal wingtip, a wingtip with winglet, and a normal wingtip ballasted to simulate the winglet mass properties. Flutter and aerodynamic data were acquired at Mach numbers from 0.6 to 0.95. The measured transonic flutter speed boundary for each wingtip configuration had roughly the same shape with a minimum flutter speed near M = 0.82. The winglet addition and wingtip mass ballast decreased the wing flutter speed by about 7 and 5%, respectively; thus, the winglet effect on flutter was more a mass effect than an aerodynamic effect. Flutter characteristics calculated using a doublet-lattice analysis (which included interference effects) were in good agreement with the experimental results up to M = 0.82. Comparisons of measured static aerodynamic data with predicted data indicated that the model was aerodynamically representative of the airplane SCW.


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    Title :

    Transonic flutter study of a wind-tunnel model of a supercritical wing with/without winglet


    Contributors:

    Conference:

    In: Structures, Structural Dynamics and Materials Conference ; 1982 ; New Orleans, LA


    Publication date :

    1982-01-01


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English







    Transonic flutter model study of a supercritical wing and winglet

    Ruhlin, C. L. / Rauch, F. J., Jr. / Waters, C. | NTRS | 1983


    Transonic flutter model study of a supercritical wing and winglet

    RUHLIN, C. L. / RAUCH, F. J. / WATERS, C. | AIAA | 1983