The Effect on Lift, Drag, and Spinning Characteristics of Sharp Leading Edges on Airplane Wings
This is a 1933 NASA technical report, issued by the National Advisory Committee for Aeronautics through the NASA Technical Reports Server, for aeronautical engineers and researchers studying wing design. The pictures are plain engineering graphs of normal force, lift, drag and pitching data plotted against angle of attack for Clark Y and related airfoil sections, tested in wind tunnels. A designer could take from them the clean, labelled line-graph style of technical plots, with dashed and solid curves marked by symbols and a legend box.
