Effects of Propellers and of Vibration on the Extent of Laminar Flow on the NACA 27-212 Airfoil
This is a 1939 NASA technical report on wind-tunnel tests of an airfoil, examining how propellers and vibration affect laminar flow, written for aeronautical engineers and researchers. Its pictures are plain engineering graphs of drag and pressure curves plotted on grid paper with dashed and solid lines, plus a photograph of a model wing and propeller mounted in a wind tunnel, which a designer might use as a restrained source of technical line-chart and laboratory imagery.
