Tests of Airfoils Designed to Delay the Compressibility Burble
A 1939 NASA technical report on wind-tunnel tests of airfoil sections designed to delay the compressibility burble, issued for aeronautical engineers and researchers. The four charts plot lift coefficient against angle of attack and pitching-moment coefficient for families of numbered NACA 16-series profiles, with each curve labelled by its section. A designer could take from them the clear way lift rises, plateaus and stalls across a family of closely related wing shapes, shown as thin dark lines on gridded graph paper.
