The Effect of the Walls in Closed Type Wind Tunnels
A 1928 NASA technical report on how the walls of closed-type wind tunnels distort aerodynamic measurements, written for aeronautical engineers and researchers. Its pictures are plotted graphs of lift coefficient against angle of attack and drag-related coefficients for wings of varying aspect ratio, with grid lines, labelled curves and scatter points on plain white pages, giving a designer a clean scientific chart vocabulary of axes, legends and data markers.
