De Havilland DH.27 Derby
The de Havilland DH.27 Derby was a large single-engined biplane designed to a heavy day bomber Air Ministry specification.The upper and lower wings were fabric-covered wooden structures, both carrying ailerons and capable of folding outside the inner interplane struts.[1] The fuselage[1] followed developing standard de Havilland practice, with spruce longerons cross-braced and covered in thin plywood.The water-cooled 650 hp (485 kW) Rolls-Royce Condor III had a rectangular nose-mounted radiator, and drove a four-bladed propeller.The two prototypes were based at RAF Martlesham Heath and the Naval station on the Isle of Grain until about 1924, and used for general duties and tests.