When the US Air Force visited Avro Canada in 1953 to look at the all weather CF-100 fighter, a "special projects group" showed them plans for a circular disk-shaped aircraft known as Project Y-2. The USAF agreed to fund the project that resulted in two Avrocar test vehicles. Control problems with the aircraft out of ground effect couldn't be overcome and the project was cancelled in 1961. Pictured is the first Avrocar (58-7055 ) that went to the Air Force. The second (59-4975) is in the collection of the US Army Aviation Museum.