Full Scale Drag Tests on Various Parts of Sperry Messenger Airplane
This 1928 NASA technical report, published as a government aeronautics memorandum for engineers and aircraft designers, records full-scale wind tunnel drag measurements on parts of a Sperry Messenger airplane. Its pictures are plain engineering charts and photographs: line graphs of drag in pounds against airspeed or dynamic pressure, a stacked bar breakdown of total drag, and photographs of the aircraft mounted in a wind tunnel, useful to a designer for their stark, grid-ruled chart style and monochrome technical look.
