Tests of Four Racing Type Airfoils in the Twenty-Foot Propeller Research Tunnel
This is a 1929 NACA Technical Note, issued by the National Advisory Committee for Aeronautics in the United States for aeronautical engineers and researchers, reporting wind tunnel tests of four racing-type airfoils in the Twenty-Foot Propeller Research Tunnel. The plates show lift-versus-drag coefficient graphs with curves plotted on fine grids for each airfoil section, along with a photograph of a wing section and an airfoil mounted on a balance in the tunnel. A designer might take from them the clean engineering plotting style of the period, the tapered thin profile of the racing wing sections, and the sparse grid-and-line graphic language of technical diagrams.
