The Drag and Interference of a Nacelle in the Presence of a Wing
This is a 1929 NACA technical report by the National Advisory Committee for Aeronautics on wind-tunnel tests of how an engine nacelle and a wing interact in drag. Its plates show metal test models in numbered configurations, which suit a designer looking for early aircraft engineering forms. The pictures are grey photographs of smooth, tapered pod shapes and flat wing sections set in rows, with small propeller spinners and streamlined cowlings that could inform a sleek, technical graphic.
