Preliminary Tests in the NACA Free-Spinning Wind Tunnel
A 1937 NACA technical report on preliminary tests in the free-spinning wind tunnel, issued through NASA's Technical Reports Server for aeronautical engineers and researchers. Its pictures are black-and-white photographs of biplane models: multi-frame sequences of a model in a spin, and mounted models photographed against plain backgrounds. A designer could take the stark frame-sequence layouts and the crisp model photography as a clear, technical documentary style.
