Wind-tunnel investigation of the aerodynamic balancing of upper-surface ailerons and split flaps
This NACA-style technical report from 1937, issued by the National Advisory Committee for Aeronautics and later catalogued by NASA, presents wind-tunnel tests of aileron and split-flap balancing on aircraft wings for aeronautical engineers. Its pictures are engineering diagrams and graphs: a wing section with dimensioned aileron and flap geometry, a plan and elevation of a tunnel installation, and lift and drag curves plotted against angle of attack in degrees, drawn in plain black line on grid paper, useful to a designer for their clean technical line work and grid layouts.
