Investigation of Boundary Layers on an Airplane Wing in Free Flight
This is a 1934 NACA Technical Memorandum, No. 751, issued by the National Advisory Committee for Aeronautics, reporting wind-tunnel and flight measurements of boundary layers on an airplane wing in free flight for aeronautical engineers. The plates are technical charts: velocity profiles drawn across airfoil sections, pressure distribution graphs, and transition plots marking where airflow turns turbulent on the suction and pressure sides. A designer might borrow their dense grid structure, thin fine-line plotting, and the precise, diagram-like layout of engineering documentation.
