Notes on aerodynamic forces on airship hulls
A 1923 NASA technical report of notes on aerodynamic forces on airship hulls, compiled from the NASA Technical Reports Server for engineers studying lighter-than-air craft. The pictures are plain line diagrams: a sphere-and-vector sketch, a flow and body-path schematic with angle and distance labels, and a grid chart plotting D/L ratios against fractional coefficients. A designer could take their clean technical linework, dashed guide lines and labelled axes as models for schematic diagrams.
