Inside Out Library · ExploreThe Effect of Airfoil Thickness and Plan Form on Lateral Control (1924)NASA Technical Reports Server (NTRS) · leaf 6Fig. 2.—Spindle for revolving airfoils.NASA Technical Reports Server (NTRS)Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.More pictures from The Effect of Airfoil Thickness and Plan Form on Lateral ControlMore like this
