General Aircraft GAL.47The General Aircraft GAL.47 was a 1940s British single-engined twin-boom air observation post aircraft, built by General Aircraft Limited at London Air Park, Hanworth.Design and developmentThe GAL.47 was a private-venture design of an air observation post aircraft. The Fane F.1/40 was the only other competing design. The GAL.47 was a twin-boom configuration with a pusher airscrew. One example was built in 1940 at London Air Park, Hanworth. It was destroyed on 2 April 1942.