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The Airspeed AS.6 Envoy, AS.10 Oxford and AS.65 Consul form a family of closely related twin-engined, low-wing monoplanes of wooden construction designed and built by the British manufacturer Airspeed Ltd. The Envoy, a light transport and airliner first flown in 1934, was developed into the Oxford, a military trainer of which more than 8,500 were built and which trained a large part of the British Commonwealth's aircrews during the Second World War. After the war, surplus Oxfords were in turn converted into a small civil transport, the Consul.
In the early 1930s Airspeed had successfully introduced the Courier, the first British aircraft with a retractable undercarriage. The company's management quickly realised that an enlarged twin-engined derivative would require far less design work than an all-new aircraft. The design effort was led by co-founder A. H. (Hessell) Tiltman, and in November 1933 Airspeed's board authorised the project; by January 1934, six aircraft, including the prototype, were already at various stages of construction.
The prototype, G-ACMT, made its maiden flight on 26 June 1934, flown by C. H. A. Colman. Confidence in the aircraft was so high that only a week later it was sent to its first public appearance, the Society of British Aircraft Constructors (SBAC) display at Hendon. By September 1934 it was undergoing certification trials at Martlesham Heath, while a racing derivative, the AS.8 Viceroy, was being prepared.
The Envoy was an all-wood low-wing cabin monoplane, with fabric-covered control surfaces, a main undercarriage retracting rearwards into the engine nacelles and a fixed tailwheel. It shared much with the Courier, including its wooden construction, the outer wing panels and the main undercarriage. The cabin normally seated eight passengers and one pilot (six if the optional lavatory was fitted), with a separate rear baggage compartment.
Airspeed initially worked closely with Wolseley Motors, whose Aries engine powered the prototype and the first production aircraft; the first two Envoys were sold to Wolseley and its owner Lord Nuffield. When Wolseley abruptly gave up aero-engine manufacture in September 1936, Airspeed offered customers a choice of engines, including the Armstrong Siddeley Cheetah and Lynx, the Wright Whirlwind and the Walter Castor. Production ran in three series: 17 Series I, 13 Series II (with split flaps) and 19 improved Series III. In Japan, Mitsubishi built eleven more under licence as the Hinazuru-type passenger transport.
Airspeed promoted the Envoy through air races and long-distance flights. The British company North Eastern Airways was the first to use it as an airliner, and Japan Air Transport and the Czechoslovak airline ČSA, which ordered four Walter Castor-engined aircraft, were among its more successful operators. Other examples went to Ansett in Australia, to Chinese provincial governors and, in May 1937, to the King's Flight, which took delivery of Envoy III G-AEXX in a distinctive red and blue livery.
Seven "Convertible Envoys" were ordered for joint use by the South African Air Force and South African Airways. They could be fitted at short notice with bomb racks and a machine gun in a hand-operated Armstrong Whitworth dorsal turret, a ground crew of four being able to convert one from transport to light bomber or reconnaissance aircraft within four hours. The experience gained with this version proved extremely valuable when Airspeed developed the Oxford.
During the Spanish Civil War, ten Envoys were obtained by the Republicans and two by the Nationalists. The Envoy was also used by the air forces of Japan, Finland, China, Slovakia and Croatia, and the Luftwaffe operated a few captured examples as trainers. The RAF used a handful for communications duties; by the end of the Second World War very few Envoys remained, and the last, G-AHAC, was scrapped in 1950.
As the RAF expanded in the 1930s and moved from biplanes to faster, more demanding monoplanes, the Air Ministry needed an advanced trainer for bomber crews. On 10 July 1936 it issued Specification T.23/36 to Airspeed, which based its design on the Envoy and on the lessons learned with the Convertible Envoy. A first batch of 136 aircraft was ordered, allowing economical flow-line production at Portsmouth, and the prototype, L4534, was flown by Percy Colman on 19 June 1937.
The Oxford was a cantilever low-wing monoplane with a plywood-covered semi-monocoque fuselage built around spruce longerons, a stressed-skin plywood wing with hydraulically operated split flaps and a wooden tail unit. It was normally powered by two 350 hp Armstrong Siddeley Cheetah X radials. With a crew of three, it could reproduce the handling of contemporary front-line aircraft and was used for flying, navigation, night and instrument flying, radio, gunnery, bombing and aerial photography training. The Mk I had a dorsal turret, while the Mk II had dual controls but no turret. When used for bomb-aimer training, the second set of controls was removed to make room for a prone bomb aimer.
Demand far exceeded Airspeed's capacity, and the Oxford was also built by de Havilland, Percival and Standard Motors. According to manufacturers' figures, 8,586 were built: 4,411 by Airspeed at Portsmouth, 550 at the Airspeed shadow factory at Christchurch, 1,515 by de Havilland at Hatfield, 1,360 by Percival at Luton and 750 by Standard Motors at Coventry (a total of 8,751 is sometimes quoted, including 165 cancelled aircraft).
Nicknamed the "Ox-box", the Oxford could train pilots, navigators, bomb aimers, gunners and radio operators simultaneously on the same flight, and it prepared complete crews for RAF Bomber Command. It was the preferred trainer of the British Commonwealth Air Training Plan, with more than 2,900 sent to Australia, Canada, New Zealand, South Africa and Southern Rhodesia. In 1941, Oxfords of No. 4 Flying Training School at Habbaniya, Iraq, were converted locally into light bombers to help defend the base. The type was also used for communications, anti-submarine patrol and as an air ambulance. The spin was notoriously difficult to recover from, and many British Oxfords carried a knotted rope from the pilot's seat to the rear door to help crews escape.
On 5 January 1941 the famous aviator Amy Johnson, then flying for the Air Transport Auxiliary, lost her way in bad weather in an Oxford and came down in the Thames Estuary, where she died. The USAAF borrowed 137 Oxfords from the RAF, mainly for communications and beam-approach training.
The Oxford remained in RAF service until 1956. Post-war, surplus aircraft equipped many air forces, including those of Belgium, which received thirty in 1946-1947 to form a flying school and used them until the late 1950s, and the Force Publique in the Belgian Congo, which received six as early as April 1944. Other users included Denmark, Ceylon, Egypt, France, Greece, India, Iran, Israel, the Netherlands, Norway, Portugal, Turkey and Yugoslavia.
As early as 1940, Airspeed's management were thinking about the fate of the many Oxfords then being mass-produced once demobilisation reduced military demand. After Victory in Europe Day, the company bought back complete and partly assembled Oxfords from the British government and began converting them into an affordable general-purpose transport. The first aircraft, G-AGVY (ex-V3679), received its certificate of airworthiness on 15 March 1946; in the standard dark blue and gold Consul livery, it was delivered to the Bata Shoe Company for flights between its European factories. Airspeed marketed the type to airlines, private owners and businesses, an innovative approach for the time.
From 1946, 162 Oxfords were converted, 50 of them between May and October 1946 alone. The changes included an extra pair of windows on each side, an elongated nose forming a baggage compartment, a partition with double doors between cockpit and cabin and a retrimmed tailplane. The cabin normally held five or six passengers, and the radio operator sat beside the pilot in the former instructor's seat. Variants included an air ambulance with a large upward-opening door (prototype G-AJWR, shown at Radlett in 1947), a convertible freighter, an executive version with lavatory, and an armed version with two machine guns, rockets and a dorsal turret.
The Consul served with many small scheduled and charter airlines as a feeder liner in Great Britain, as well as in Belgium, Iceland, Ireland, Malta, East Africa and Canada, and it was the first type operated by Malayan Airways, the predecessor of Singapore Airlines and Malaysia Airlines. Several large industrial companies used it as an executive aircraft. Its wooden structure, tricky handling and small capacity limited its life, but it is believed to have been Airspeed's only financially successful civil transport.
Many Consuls went to military users. In Israel, they trained transport and Mosquito crews with 141 Squadron, and in June 1949 one carried Prime Minister David Ben-Gurion on a tour of southern Israel. In the Belgian Congo, the Force Publique received six Consuls (C-31 to C-36) in 1948-1949, whose large loading door made them ideal for medical evacuation; withdrawn in 1954-1955, four were then sold to Natal Airlines in South Africa. Other military users included Argentina, Burma, New Zealand and Turkey.
Envoy
Oxford
Consul
No Envoy survives. Several Oxfords are preserved, including:
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