Correction of Profile-Drag Results from Variable-Density Tunnel and the Effect on the Choice of Wing-Section Thickness
This is a 1938 NACA technical report on wind-tunnel profile-drag measurements of airfoil sections, compiled for aeronautical engineers and researchers. The single plot charts drag coefficient against maximum thickness as a fraction of chord for symmetrical and cambered series, with each curve marked by a distinct symbol and a legend. A designer could take from it the clean, grid-based graph style of 1930s engineering data, with rising curves, plotted point markers and dense axis labels useful for technical diagram references.
