Tests have been conducted at Reynolds numbers up to 8,000,000 to determine the effectiveness of a reflex-cambered mean line in shifting the low- drag range of a highly tapered, moderately sweptback wing without materially affecting the longitudinal stability. Two models were tested, one with symmetrical airfoil sections and the other with the same basic thickness forms but with a reflex-cambered mean line: (1) the upper limit of the low-drag range was shifted from a lift coefficient of about 0.35 to about 0.65; (2) airplane trim was unaffected at zero lift but at low lift coefficients the neutral point was moved forward about 2 percent of the mean aerodynamic chord and at lift coefficients beyond the low-drag range the forward shift in the neutral point was more sever; (3) the wing stall was delayed but, once started, progressed more rapidly; and (4) the maximum lift coefficient, if the wings were trimmed, would be slightly increased.


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    Title :

    Effect of Reflex Camber on the Aerodynamic Characteristics of a Highly Tapered Moderately Swept-Back Wing at Reynolds Numbers up to 8,000,000


    Contributors:

    Publication date :

    1947


    Size :

    25 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English