Winglet airfoil section characteristics which significantly influence cruise performance and handling qualities of an airplane are discussed. A good winglet design requires an airfoil section with a low cruise drag coefficient, a high maximum lift coefficient, and a gradual and steady movement of the boundary layer transition location with angle of attack. The first design requirement provides a low crossover lift coefficient of airplane drag polars with winglets off and on. The other requirements prevent nonlinear changes in airplane lateral/directional stability and control characteristics. These requirements are considered in the design of a natural laminar flow airfoil section for winglet applications and chord Reynolds number of 1 to 4 million.


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    Title :

    Natural laminar flow airfoil design considerations for winglets on low-speed airplanes


    Contributors:

    Publication date :

    1984-12-01


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English


    Keywords :