Air forces on airfoils moving faster than sound
A 1925 NASA Technical Reports Server document, a technical report on aerodynamic forces on airfoils moving faster than sound, compiled for aeronautical engineers and researchers. The three pictures are engineering diagrams: a supersonic wave pattern of angled lines drawn from a thin airfoil, a pressure diagram marking positive and negative pressure zones beside a 1020 m/sec airflow, and a set of graphs plotting pressure ratio, density and related curves against angle. A designer might take from them the stark, radiating geometry of shock wave fans and the plain line-graph style of early aerodynamic documentation.
