Flight tests for the determination of static longitudinal stability
This 1930 NASA technical report, compiled from NACA flight research and held by the NASA Technical Reports Server, sets out measured flight-test results for aircraft longitudinal stability, written for aeronautical engineers and test pilots. Its pictures are plain engineering graphs and diagrams: a calibration curve plotting recording height in millimetres against a scale, a stepped airspeed trace in km/h with lettered test points, and a labelled side-view aircraft drawing with dimension lines and a tailplane angle. A designer might borrow their clean, measured line work and the stepped-chart layout as a restrained technical motif.
