Air Force Tests of Sperry Messenger Model with Six Sets of Wings
A 1928 NASA Technical Reports Server record of wind-tunnel test results for a Sperry Messenger aircraft model fitted with six different wing sections, prepared for aeronautical engineers and researchers. The pictures are plain engineering charts: paired line graphs of lift and drag coefficients against angle of attack, a horsepower-against-speed curve, and polar plots with labelled wing profile curves in black ink on cream paper, offering a designer little beyond the restrained scientific grid and line-graph vocabulary of early aviation research.
