Wind-tunnel investigation of NACA 23012 airfoil with various arrangements of slotted flaps
A 1939 NACA technical report from the National Advisory Committee for Aeronautics, issued by NASA's Technical Reports Server, presenting wind-tunnel test results for a NACA 23012 airfoil fitted with slotted flaps. The pages show lettered plots of pressure-distribution contours across chord positions, with some layouts of flap arrangements, giving a designer a clear example of technical engineering diagrams in a plain grid-and-contour style.
