Aerodynamic Characteristics of a 4-engine Monoplane Showing Effects of Enclosing the Engines in the Wing and Comparisons of Tractor- and Pusher-propeller Arrangements
This is a 1938 NACA technical report on wind tunnel tests of a four-engine monoplane model, with engines enclosed in the wing and tractor versus pusher propeller arrangements, prepared for aeronautical engineers and researchers. The three pictures show the scale model mounted on struts inside the full-scale wind tunnel, photographed from several angles with the propeller and nacelle details visible. A designer might take from them the spare, documentary look of mid-century engineering photographs, with bare struts, plain grey tones and numbered figure captions.
