Tests of 16 related airfoils at high speed
This NACA technical report from 1935 presents wind-tunnel test data on sixteen related airfoil sections at high subsonic speeds, published by NASA's Technical Reports Server for aeronautical engineers. The pictures are dense line graphs of drag coefficient, moment coefficient and angle of attack plotted against lift and speed ratio, with airfoil cross-section outlines at the top; a designer might take from them only the smooth curved trends and sparse grid layouts as a restrained scientific graphic style.
