The application of nonplanar wings such as Whitcomb's winglet to subsonic transport airplanes is discussed. A simple numerical method was developed to calculate the minimum induced drag for a wing of an arbitrary nonplanar configuration, using the Trefftz-plane (far-field) analysis and the Lagrangian multiplier technique. For a series of wing/winglet combinations and several more complex forms such as curved wings, the value of the induced drag efficiency parameter I/e is evaluated and compared with that of a conventional planar wing. When comparing the induced drag benefits, it is assumed that both wings have the same extended wing planform rather than the projected one. To take account of the trade-offs between wing aerodynamic efficiency and wing structural weight, the wing root bending moment as well as the wing total lift are kept constant. With these constraints, the drag performances for both wings could be compared without any ambiguity associated with wing structural weight and wing surface skin friction.


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    Titel :

    Optimum Design of Nonplanar Wings: Minimum Induced Drag for a Given Lift and Wing Root Bending Moment


    Beteiligte:
    K. Asai (Autor:in)

    Erscheinungsdatum :

    1984


    Format / Umfang :

    23 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch