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    The Effect of Surface Irregularities on Wing Drag. II - Lap Joints (1938)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Tests have been made in the NACA 8-foot high-speed wind tunnel of the drag caused by four types of lap joint. The tests were made on an airfoil of NACA 23012 section and 5-foot chord and covered in a range of speeds from 80 to 500 miles per hour and lift coefficients from 0 to 0.30. The increases in profile drag caused by representative arrangements of laps varied from 4 to 9%. When there were protruding rivet heads on the surface, the addition of laps increased the drag only slightly. Laps on the forward part of a wing increased the drag considerably more than those farther back.
    Keywords: Aerodynamics
    Type: NACA-SR-77
    Format: application/pdf
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