Some studies on the aerodynamic effect of the gap between airplane wings and fuselages
A 1929 NACA technical report on aerodynamic studies of the gap between airplane wings and fuselages, issued by the NASA Technical Reports Server for aeronautical engineers and researchers. The pictures are plain line drawings of a monoplane model in three arrangements with cross-section views labelled A-A, plus a graph of lift coefficient against a dimensionless parameter, giving a designer clean technical diagrams of aircraft profiles and sectional outlines.
