Results of experiments with slotted wings
A 1924 aeronautical research report from the NACA, distributed through the NASA Technical Reports Server, presenting wind-tunnel results for slotted wings for aeronautical engineers. The pictures are mostly lift-against-drag and moment charts plotted as curves with circled test points, labelled with angles of attack, alongside small sketches of wing cross-sections with one, two or more slots. A designer could take from them the clean line-graph style of technical plots and the simple profile silhouettes of airfoils.
