Goodyear started developing light helicopters in 1954. The GA-400R was the third in the series. The helicopter was not put into production.[2]
The one-man helicopter was designed to be lightweight and simple. The airframe is made of welded aluminum tubing. The rotor blades have wooden cores with fiberglass surfaces. The engine is a Johnson outboard marine engine. The transmission used rubber belts. The Gizmo has demonstrated low autorotation sink rates of 1200ft/min.
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