The effect of partial-span split flaps on the aerodynamic characteristics of a Clark Y wing
This 1933 NACA technical note, issued by the National Advisory Committee for Aeronautics in the United States, reports wind-tunnel test results for partial-span split flaps on a Clark Y airfoil, written for aeronautical engineers. Its pictures are plain engineering graphs and a cross-section drawing, with grid lines, labelled axes, and curves of lift coefficient against angle of attack, useful to a designer for the clean diagram style and the stepped line-symbol legends.
