The Air Forces on a Model of the Sperry Messenger Airplane Without Propeller
This is a 1926 NASA technical report, issued through the NASA Technical Reports Server, on wind-tunnel tests of a scale model of the Sperry Messenger airplane without its propeller, written for aeronautical engineers. The pictures show a model biplane mounted in a wind tunnel, three views of the finished model, and a graph of drag coefficient against lift angle. A designer could take from them the clean two-bay biplane silhouette with its wheeled undercarriage and the plain engineering chart styling.
