Comparison of model propeller tests with airfoil theory
This is a 1925 NASA technical report, issued by the NASA Technical Reports Server collection, comparing wind tunnel measurements of model propeller blades against theoretical airfoil lift and drag predictions. Its pictures are plain engineering plots and a diagram: two graphs of lift coefficient, drag coefficient and lift-to-drag ratio against angle of attack for the Durand 37 and Durand 14 sections, with a geometric figure of an airfoil with lift and drag vectors resolved into a force triangle. A designer might borrow the restrained chart styling, the dense gridded layouts and the labelled vector diagram as a model for technical graphics.
