Load assumptions for calculating the strength of airplanes
A 1930 NACA technical memorandum from the NASA Technical Reports Server, issued as a specification document for aircraft structural engineers. It sets out load assumptions used to calculate airplane strength. The pages show graphs of impact and side load factors against flying weight, plus diagrams of load distribution along a spar or member. A designer could take from them the clean engineering-chart look: thin black grid lines, labelled curves fanning upward, and simple stepped and tapered load diagrams with hatched fills.
