Comparison of Full-Scale Propellers Having R.A.F.-6 and Clark Y Airfoil Sections
This is a 1932 NASA technical report comparing full-scale aircraft propellers built with R.A.F.-6 and Clark Y airfoil sections, issued as an engineering record for aeronautical researchers. The pictures are plain graphs of thrust, power and efficiency curves plotted on grid paper across the advance ratio, plus a close photograph of a test rig with wooden blades and struts, offering a designer sober line-chart and grid vocabulary rather than decorative imagery.
