Hydrodynamic and Aerodynamic Tests of Four Models of Outboard Floats : (N.A.C.A. Models 51-A, 51-B, 51-C, and 51-D)
This is a 1938 NACA technical note reporting hydrodynamic and aerodynamic tests of four outboard float models, published by the National Advisory Committee for Aeronautics for aircraft engineers and researchers. The single plate shows a float model mounted in a wind tunnel, photographed from a low angle with a grid of tunnel framing behind it, and a designer might take from it the stark, utilitarian look of engineering test photography with its strong diagonal struts and pale curved surfaces.
