Gloster AS.31 Survey
| A.S.31 Survey | |
|---|---|
| Role | Photo-survey biplane |
| National origin | United Kingdom |
| Manufacturer | Gloster Aircraft Company |
| First flight | 1929 |
| Primary users |
Aircraft Operating Company South African Air Force |
| Number built | 2 |
The Gloster A.S.31 Survey was a 1920s British photo-survey biplane developed by the Gloster Aircraft Company from the de Havilland DH.67 design project.
In 1926, the Aircraft Operating Company, an official contractor to the British Ordnance Survey for aerial survey work overseas, required a replacement for the converted Airco DH.9s that formed the majority of its fleet.
The requirements included maximum reliability, all-metal construction so that it could operate in the tropics or the arctic, a preference that it could be broken down into parts for transport. It should be able to maintain height at 9,000 ft on a single engine while fully laden.
It approached the de Havilland Aircraft Company which prepared a design for a twin-engined biplane of metal construction, resembling a smaller version of the de Havilland Hercules to meet the specification, designated de Havilland DH.67. However, de Havilland was busy with production of the Hercules and DH.60 Moth and in November 1928 it transferred the project to Gloster Aircraft Company.
The customers requirement was for an aircraft that could be converted to a seaplane and capable of surveying large areas while operating from a single base. Under Folland, Gloster comprehensively redesigned the aircraft with changes in all dimensions and for its own construction methods, the resulting aircraft being designated as Gloster AS.31 Survey.
The Gloster Survey was a twin-engined biplane with a conventional landing gear and an open cockpit for two pilots, while a camera operator and survey camera could be accommodated in the enclosed cabin. The entirety of the front portion of the floor of the aircraft was glazed for so that three cameras could be installed.
It was powered by two 525 hp (392 kW) Bristol Jupiter XI engines, mounted on top of each lower wing. Provision was made in the design to take alternative engines including the Armstrong Siddeley Jaguar, Pratt & Whitney Hornet, Lorraine-Dietrich 14Asc and Wright Cyclone.
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