The Percival Proctor was a series of British two or three-seater radio and navigation trainer and communications aircraft used by the Royal Navy and Air Transport Auxiliary during the Second World War. The Percival Proctor was a low-wing cantilever monoplane made of wood with a fabric covering powered by a De Havilland Gipsyqueen II 6-cylinder inverted air-cooled engine providing a top speed of 256 kmh. A civil version, the Percival Proctor V was also produced with seating for three/four people and space for luggage in the cabin. Research Proctor