Travel of the center of pressure of airfoils transversely to the air stream
This is a 1929 NASA technical report on how the center of pressure of airfoils shifts sideways relative to the air stream, issued through the NASA Technical Reports Server for aeronautical engineers and researchers. Its pictures are plain line diagrams: planform outlines with scale axes, plotted trajectories of pressure-center points labelled with numbers, and a mechanical linkage schematic with a sectional elevation and a plan view. A designer could borrow the clean, technical diagram style, with labelled dimension arrows and dotted traces, for an engineering or instructional graphic.
