The Effect of Lateral Inclination of the Thrust Axis and of Sweepback of the Leading Edge of the Wing on Propulsive and Net Efficiencies of a Wing-Nacelle-Propeller Combination
This is a 1935 NASA technical report on wing, nacelle and propeller combinations, published by the National Advisory Committee for Aeronautics for aeronautical engineers and researchers. The two photographs show a wind-tunnel model mounted on a wooden test rig, with a nacelle and wing set at different angles against a window-lit laboratory wall. A designer might take from them the stark, technical look of early aerodynamic test setups, with lattice frames, angled struts and a sharp contrast between dark model and pale background.
