Flying saucers from Canada? Sometimes the truth is stranger than fiction.
From the US. Air Force Museum where you can see an Avrocar prototype on display:
The Avrocar was the result of a Canadian effort to develop a supersonic, vertical takeoff and landing (VTOL) fighter-bomber in the early 1950s. However, its circular shape gave it the appearance of a “flying saucer” out of science fiction movies. A.V. Roe Avro Aircraft Limited (later Avro Canada) based its design concept for the Avrocar on using the exhaust from turbojet engines to drive a circular “turborotor” which produced thrust. By directing this thrust downward, the turborotor would create a cushion of air (also known as “ground effect”) upon which the aircraft would float at low altitude. When the thrust was directed toward the rear, the aircraft would accelerate and gain altitude. In 1952, the Canadian government provided initial funding but dropped the project when it became too expensive. Avro offered the project to the U.S. government, and the U.S. Army and U.S. Air Force took it over in 1958. Each service had different requirements: the Army wanted to use it as a subsonic, all-terrain troop transport and reconnaissance craft, but the USAF wanted a VTOL aircraft that could hover below enemy radar then zoom up to supersonic speed. Avro’s designers believed they could satisfy both services, but these two sets of requirements differed too much.Research data originally indicated that a circular wing might satisfy both the Army’s and Air Force’s requirements, and Avro built two small test vehicles to prove the concept. Designated the VZ-9AV Avrocar (“VZ” stood for “experimental vertical flight,” “9” for the ninth concept proposal, and “AV” for Avro). Tests with scale models at Wright-Patterson AFB, Ohio, indicated that the cushion of air under the Avrocar would become unstable just a few feet off the ground. The aircraft would be incapable of reaching supersonic speeds, but the testing went ahead to determine if a suitable aircraft could be developed for the Army. The first prototype was sent to the National Aeronautics and Space Administration (NASA) Ames Research Center at Moffett Field, Calif. There, wind tunnel tests proved that the aircraft had insufficient control for high speed flight and was aerodynamically unstable. The second Avrocar prototype underwent flight tests that validated the wind tunnel tests. If it flew more than three feet above the ground, the Avrocar displayed uncontrollable pitch and roll motions, which the Avro engineers called "hubcapping." The Avrocar could only reach a maximum speed of 35 mph, and all attempts to end the hubcapping failed. The project was cancelled in December 1961.
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