Aerodynamic characteristics of airfoils IV : continuation of reports nos. 93, 124, and 182
This is a 1927 technical report continuing NACA airfoil test series, issued by a government aeronautics agency for aircraft engineers and researchers. Its pages carry dense grids of plotted curves, each panel labelled with an airfoil section number, showing lift, drag and moment coefficients against angle of attack and Reynolds number. A designer could take from them the restrained, mathematical look of early engineering charts: fine grid lines, small tabular labels, and paired curves plotted on common axes.
