Measurement of the Differential and Total Thrust and Torque of Six Full-Scale Adjustable-Pitch Propellers
This is a NASA technical report from 1933 on measuring the thrust and torque of six full-scale adjustable-pitch propellers, written for aeronautical engineers and aerodynamics researchers. The pictures are plain engineering graphs with solid and dashed curves, numbered series labelled by pitch angle or advance ratio, and axes of coefficient against radius or advance ratio, so a designer might take only their restrained tonal rhythm and grid structure as a source of quiet data-visualisation patterns.
