1974-02-01

LOW-SPEED AERODYNAMIC CHARACTERISTICS OF A 13.1-PERCENT-THICK, HIGH-LIFT AIRFOIL * 740366

This paper is concerned with the experimental study of the low-speed, sectional characteristics of a high-lift airfoil and the comparison of those characteristics with the predictions of the theoretical methods used in the airfoil's design. The 13.1-percent-thick, UI-1720 airfoil was found to achieve the predicted maximum lift coefficient of nearly 2.0. No upper-surface, flow separation was found below the stall angle of attack of 16 degrees; it appeared that stall was due to an abrupt leading-edge flow separation.

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