Aerodynamic characteristics of thin empirical profiles and their application to the tail surfaces and ailerons of airplanes
A 1928 NASA technical report on aerodynamics, compiled from earlier research, that studies thin empirical airfoil profiles and how they apply to airplane tail surfaces and ailerons. The pictures are technical line diagrams: geometric sketches of a circle with offset ellipse-like profile outlines labeled with points and axes, plus a plotted graph of coefficient values against a horizontal scale with scattered data points and a smooth curve. A designer could take from them the clean schematic style of engineering drawings, with thin dark strokes, dashed reference circles, and labeled lettering on a white field.
