Correction of downwash in wind tunnels of circular and elliptic sections
This is a 1936 NASA technical report, issued through the NASA Technical Reports Server, on correcting airflow downwash for wind tunnels with circular and elliptic cross sections, written for aerodynamics engineers. Its pictures are line diagrams and graphs: horseshoe vortex systems drawn in three-dimensional coordinate axes, curves of coefficients plotted against angle, and a tunnel cross section with labelled points, all in fine black ink on white. A designer might borrow the clean vector-like linework, the thin ruled grids, and the sweeping curved lines.
