Deflection of Propeller Blades While Running
A 1922 technical report from the NASA Technical Reports Server, catalogued from the NACA-era aeronautics archive, documenting measurements of propeller blade deflection for engineers and researchers. The single photograph shows a cluttered test workshop with a tripod-mounted camera, a belt-driven machine on a bench, and tall wooden instrument stands with dials and pulleys overhead, offering a designer a raw, dense view of early experimental engineering equipment.
