Investigations on the amount of downwash behind rectangular and elliptical wings
A 1936 NASA technical report, drawn from the NASA Technical Reports Server, presenting experimental investigations of downwash behind rectangular and elliptical aircraft wings for aeronautical engineers. Its pictures are dense engineering graphs of downwash factors plotted against angle and position, with labelled curves, dotted data points, and a sketched wing plan and vortex-height chart that a designer could use for abstract line-and-curve patterns.
