The Effect of Slots and Flaps on the Lift and Drag of the Mcdonnell Airplanes Determined in Flight
A 1931 NACA technical note by the National Advisory Committee for Aeronautics, issued as a research report on flight tests of McDonnell airplanes fitted with slots and flaps. The pictures are engineering charts of lift and drag coefficients plotted against angle of attack in degrees, with photographs and a three-view drawing of the aircraft. A designer could draw on the clean grid plots, the sparse line-and-dot charts and the precise technical drawings of an early monoplane with its dimensioned views.
