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Donald A. Hall Estate Collection

Experimental Autogyro on the Ground (1927)

A parked experimental autogyro with a large radial engine, three-blade propeller, and a massive overhead rotor, sitting in a grassy field. — Experimental Autogyro on the Ground (1927) · Donald A. Hall Estate Collection

The unique mechanics of early autogyros were of great interest to Hall as he tracked the broader evolution of aeronautical engineering.