Air force and moment for N-20 wing with certain cut-outs
A 1928 NASA technical report on wind-tunnel measurements of an N-20 wing section with various cut-outs, prepared for aeronautical engineers and researchers. Its pictures are dense engineering charts of lift, drag and pitching-moment coefficients against angle of attack and speed factor, plus small wing profile sketches with a chord-length curve, which a designer might use for the shape of a wing cross-section and its performance trends.
