Theory of two-dimensional potential flow about arbitrary wing sections
This 1939 NASA technical report, a theoretical aerodynamics paper on two-dimensional potential flow around airfoil sections, was written for engineers and researchers in aeronautics. Its figures are hand-drawn diagrams: complex-plane mappings of an airfoil outline, with labelled axes, circles and arrows marking the transformation from a circle to a wing profile, and a velocity vector sketch. A designer could borrow the clean line-diagram style and the teardrop airfoil silhouette as a technical motif.
