Contribution to the systematic investigation on Joukowsky profiles
This is a 1928 NACA technical memorandum on aerofoil research, issued by the National Advisory Committee for Aeronautics for aircraft engineers and aerodynamicists, reporting a systematic study of Joukowsky profile families. Its pictures are dense engineering charts: contour-line diagrams plotting lift and drag coefficients against camber and thickness ratios, with numbered profile curves, grid axes and tabulated values. A designer might borrow the layered contour-map style and the clean monochrome grid-and-curve graphics as abstract linear pattern.
