The air forces on a systematic series of biplane and triplane cellule models
A 1927 NACA technical report from the NASA Technical Reports Server, presenting wind-tunnel test results on a systematic series of biplane and triplane wing cellule models for aeronautical researchers. The pages are dense rows of graphed lift and drag curves, each row labelled Lower, Middle and Upper for the wing position, with a final plot comparing the layouts. A designer could take from them the restrained, grid-based charting style of engineering data plots, with thin black curves, stepped axes and handwritten-looking labels on white paper.
