Comments on Crankless Engine Types
A 1928 NASA technical report, Comments on Crankless Engine Types, issued as a series of engineering plates for aviation and automotive engineers studying alternatives to the conventional crankshaft. Its pictures include cutaway drawings of radial and opposed-piston aircraft engines, a thrust collar detail with flow lines, and a performance graph of horsepower, torque and friction against speed. A designer might take from them the precise line-drawing style of mechanical cutaways and the clean hierarchy of labelled plates on a grey field.
