Wind-tunnel Investigation of Ground Effect on Wings with Flaps
This 1939 NASA technical report, compiled by NASA's Technical Reports Server, presents wind-tunnel test results on how proximity to the ground alters the performance of wings fitted with flaps. Its pages are engineering graphs of pitching-moment, lift and drag coefficients plotted against angle of attack, with small wing-profile sketches above each set. For a designer, the value lies in the clean, uniform plotting style: crisp curve families, dotted and dashed line variations, and labelled axes that suit diagrammatic layouts.
