Functioning of reduction gears on airplane engines
This NACA technical memorandum from 1926, issued by the United States National Advisory Committee for Aeronautics and held in the NASA Technical Reports Server, is an engineering report on how reduction gears work in aircraft engines, written for aeronautical engineers. Its pictures are plain mechanical line drawings: a sectional view of a geared hub with a propeller shaft and crank shaft, and small schematic diagrams of gear arrangements, drawn in black ink on white paper, offering a designer clean technical diagram conventions and hatched cross-section shading.
