sentences:  The Saro-Percival Mailplane was a three-engined monoplane mail plane designed by Edgar Percival, and built by Saunders-Roe Limited (Saro) at Cowes in 1931, the aircraft first flying early in 1932.It was a low-winged monoplane, with a wooden wing and plywood fuselage, and was powered by three 120 hp de Havilland Gipsy III engines.When Saro was financially re-organised, Percival sold his interest in the aircraft to Saro, who re-designated it as the Saro A.24 Mailplane.