Problems of flight in turbulence
A 1975 NASA-distributed technical report by G. Coupry on aircraft response to atmospheric turbulence, written for aeronautical engineers and flight-dynamics researchers. The figures are hand-lettered line diagrams and plotted curves reproduced from a worn photocopy, giving delta-wing plan outlines with velocity vectors, labeled axis crosses, and frequency-spectrum traces with broken, blotted strokes useful as degraded technical linework.
