Aerodynamic Theory and Tests of Strut Forms-II
A 1930 NASA technical report on aerodynamic theory and wind-tunnel tests of strut cross-section shapes, written for aeronautical engineers and researchers. Its pictures are plain line diagrams: flow-line and pressure-distribution plots around airfoil-like struts, and graphs of pressure coefficients across chord positions, all in black ink on cream paper. A designer might take from them the clean, technical graphic language of early aerodynamic charts, with dense curve families and labelled axes.
