I \ Fig.l. Mcael of Autogiro, with rubber elastio ao propelling force, exhlbitea before the Technioal Coinmlttee of the Aero Club in 1931. … Fig.3. Autogiro No.l. Fig,;5. Autc^iro No.3,
NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
