Results of recent experiments with slotted wings
This is a 1925 NACA technical memorandum on slotted wings, published by NASA's Technical Reports Server from a NACA series of aerodynamic test reports. The pictures are engineering graphs and drawings: lift-against-drag polar curves for slot and aileron configurations, cross-section wing profiles, and velocity-profile diagrams with numbered measurement stations. A designer might take their clean line-and-grid vocabulary, with labelled axes, dotted curves and plotted data points, as a model for technical diagram layouts.
