Inside Out Library · ExploreTest of a model propeller with symmetrical blade sections (1926)NASA Technical Reports Server (NTRS) · leaf 14N.A.C.A. Technical Hote No.2-16 Fig. 3NASA Technical Reports Server (NTRS)Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.More pictures from Test of a model propeller with symmetrical blade sectionsMore like this
