Effects of Propellers and of Vibration on the Extent of Laminar Flow on the NACA 27-212 Airfoil

NACA WARTIME REPORTS are reprints of papers originally issued to provide rapid distribution of advance research results to an authorized group requiring them for the war effort.They were previously held under a security status but are now unclassified.Some of these reports were not tech-{lically edited.All have been reproduced without change in order to expedite general distribution.