An investigation on the effect of raked wing tips
A 1921 NASA technical report investigating how raked wing tips affect aircraft wing performance, drawn from the NASA Technical Reports Server collection. The pictures are plain engineering line graphs with grid lines, curves marked with x-points, and labelled angle curves, plotting lift and drag ratios against wing rake angle for different settings. A designer might borrow the clean, minimal scientific chart style: thin grid lines, labelled curve families, and restrained annotation.
