A method of estimating the aerodynamic effects of ordinary and split flaps of airfoils similar to the Clark Y
This NACA technical report from 1936, issued by the National Advisory Committee for Aeronautics, gives a method for estimating flap effects on Clark Y airfoils for aircraft wing designers and engineers. Its three pictures are line graphs of pitching-moment increments, location factors and hinge-moment coefficients plotted against flap centroid and lift coefficient, with labelled curves for flap deflections of 15 to 60 degrees, offering a clean, sparse grid-and-curve vocabulary for technical diagrams.
