The Effect on Rudder Control of Slip Stream Body, and Ground Interference
This 1922 NASA technical report, issued through the NASA Technical Reports Server, presents aeronautical wind-tunnel and flight test findings on how rudder control is affected by slipstream and ground proximity, written for engineers and aircraft designers. The pictures are plain engineering material: a three-view line drawing of fuselage outlines with a scale bar, a dim photograph of a rigged aircraft model with its wing and rudder arrangement, and a line graph of yawing moment against rudder angle with families of curves labelled by angle of yaw. A designer might take from them the clean diagram conventions and the way a graph can chart control response across several settings.
