The Pressure Distribution over the Wings and Tail Surfaces of a PW-9 Pursuit Airplane in Flight
A 1931 NACA technical report plate set, published by the National Advisory Committee for Aeronautics, documenting pressure tests on a PW-9 pursuit airplane in flight. The photographs show a biplane fighter with instrumentation tubing and pressure orifices fitted along its wings and tail. A designer could draw on the precise, diagrammatic clarity of these engineering photographs, with their neat tube runs and grey metal surfaces.
