Maximum Forces Applied by Pilots to Wheel-type Controls
This is a 1937 NACA Technical Note, issued by the National Advisory Committee for Aeronautics and distributed through the NASA Technical Reports Server, reporting measurements of the maximum push, pull and tangential forces pilots could apply to wheel-type aircraft controls. The pictures are plain black-and-white photographs of a test rig with a seated man, shot straight-on with no styling, so a designer might take from them the seated posture and mechanical framing used to measure force.
