Relation Between the Stability Characteristics and the Controllability of German Airplanes
This is a 1930 NASA technical memorandum, translated from German, reporting flight tests on the stability and control of German aircraft for aeronautical engineers and researchers. The pictures are plain engineering graphics: a contour diagram of slipstream pressure around a fuselage, a line chart of control force against airspeed, and photographs of aircraft tail surfaces with balance panels. A designer could draw on their rigid, labelled diagram style, the flat black-on-cream typewritten layout, and the stark photographic close-ups of tail control surfaces.
