Full-Scale Tests of NACA Cowlings
This is a 1937 NACA report from the National Advisory Committee for Aeronautics, published as a technical report for engineers and aeronautical researchers, presenting full-scale wind-tunnel and flight tests of engine cowlings. The pictures are plates of photographs and line charts: smoke-streak and propeller photographs of cowl airflow, close views of cowl rings and skirt shapes, and graphs of pressure distribution over differently flared skirts. A designer could take from them the stark, high-contrast look of engineering documentation, with repeated sequential frames and clean grid-line diagrams.
