Gray Goose Airways Windmill Plane
Built circa 1936, the Windmill Plane was an ornithopter type, with four tandem walking beams that opened and closed ten overhead slats, all of this mounted on a four-wheeled gondola with an unknown, but large, powerplant. No record of flight was found. The Windmill Plane appears in the video, "Golden Years of Aviation," showing its set of rotating wings on either side of a horizontal axle. It was able to taxi only after being pushed by 10 men, but was never seen flying.