Wind-tunnel Tests of a Hall High-life Wing
This is a 1932 aeronautical technical report from the NASA Technical Reports Server, a wind-tunnel study of a wing section with a Hall high-life flap arrangement, written for aircraft engineers. Its pictures are engineering line drawings and graphs: a wing profile with dimensioned ordinates and flap hinge, plotted lift and drag curves against angle of attack for several flap settings, and a labelled section drawing of a Clark Y wing with a Cunningham-Hall airplane linkage. A designer might take from them the clean technical-drawing style of dimensioned cutaways, tabulated data sheets, and grid-based line graphs with dashed and dotted series keys.
