Pressure Distribution Tests on a Series of Clark Y Biplane Cellules with Special Reference to Stability
This is a 1933 NACA technical report of aerodynamic wind-tunnel test data on biplane wing cellules built around the Clark Y airfoil, aimed at aeronautical engineers and researchers studying stability. The pictures are plain engineering line graphs of rolling-moment and normal-force coefficients against angle of attack, plus a wing plan sketch with pressure orifice locations; a designer might take their clean grid-and-curve layout and sparse labelling as a model for technical chart styling.
