Experimental investigation of the effect of an oscillating airstream (Katzmayr effect) on the characteristics of airfoils
This is a 1924 NACA technical note from the National Advisory Committee for Aeronautics, written for aeronautical engineers and researchers, reporting experiments on an oscillating airstream (the Katzmayr effect) and its influence on airfoil lift and drag. The pictures are plain engineering line drawings and graphs: plotted curves of lift and drag coefficients against angle of attack, a cross-section of a rotating blade-deflector rig, and assembly details of hardwood blocks and spruce deflectors, all in black ink on cream paper with typed captions, offering a designer a clear diagrammatic vocabulary of technical charts.
