Developed by de Havilland at Hatfield, the Queen Bee retained the Tiger Moth's familiar silhouette but replaced the metal-frame fuselage with an inexpensive spruce-and-plywood structure that would float if ditched at sea. The enclosed rear cockpit housed radio-control equipment, with pneumatically operated servo units linked to the elevator and rudder. A naval operator on the deck of a warship could guide the aircraft through evasive maneuvers, providing gun crews with a target that turned and twisted like a hostile bomber. The Royal Navy conducted trials between 1927 and 1929 with earlier experiments, but the Queen Bee of 1935 became the first viable, production-scale application of the concept.