Method of curved models and its application to the study of curvilinear flight of airships. Part I
This NACA technical memorandum from 1937, issued by the National Advisory Committee for Aeronautics and preserved through NASA's Technical Reports Server, is an engineering report for aeronautical researchers on curved wind-tunnel models for studying airship turns. Its pictures are line diagrams of streamlines, flow fields and geometric construction lines drawn in black ink on white paper, offering a designer clean hatched contour bands, dashed construction geometry and labelled vector arrows as a source of technical diagram structure.
