Experimental apparatus for the study of propellers
A 1937 NASA Technical Reports Server publication of engineering drawings for experimental propeller test apparatus, issued as a numbered technical memorandum for aeronautical researchers. The pictures are black-and-white line drawings: plan and elevation views of a rotor hub with radiating blades, a cylindrical test body on a stand, mechanical linkages, and vector diagrams of blade forces. A designer might take from them the clean, schematic language of technical draftsmanship, with thin construction lines, lettered callouts, and dimensioned sections.
