Tests of N.A.C.A. airfoils in the variable density wind tunnel Series 44 and 64
This is a 1931 NACA technical report from the NASA Technical Reports Server, issued by the National Advisory Committee for Aeronautics for aeronautical engineers and researchers, presenting wind tunnel test results for airfoil series 44 and 64. Its pictures are plain engineering line graphs of lift coefficient against angle of attack, profile drag curves, and a maximum thickness chart, with labelled curves in grids. A designer might take from them the clean, sparse plotting style and the sweeping curved line families.
