| Proctor | |
|---|---|
 RAF Percival Proctor IV | |
| General information | |
| Type | Radio trainer/communications aircraft |
| Manufacturer | Percival Aircraft Limited |
| Designer | |
| Primary users | Royal Air Force |
| Number built | 1,143 |
| History | |
| First flight | 8 October 1939 |
| Retired | 1955 |
| Developed from | Percival Vega Gull |
The Percival Proctor is a British radio trainer and communications aircraft of the Second World War. The Proctor is a single-engined, low-wing monoplane with seating for three or four, depending on the model.
The Proctor was developed from the Percival Vega Gull in response to Air Ministry Specification 20/38 for a radio trainer and communications aircraft. To meet the requirement, the aircraft based on the Vega Gull had larger rear cabin windows and the fuselage was six inches (150 mm) longer. Modifications were made to the seats to enable the crew to wear parachutes, and there were other changes to enable a military radio and other equipment to be fitted. In early 1939, an order was placed for 247 aircraft to meet operational requirement OR.65.
The prototype aircraft, serial number P5998, first flew on 8 October 1939 from Luton Airport, [1] and the type was put into production for the RAF and Fleet Air Arm. The prototype was tested as an emergency bomber during 1940 but that idea was abandoned when the invasion threat receded. Although the first 222 aircraft were built by Percival at Luton, most of the remaining aircraft were built by F. Hills & Sons of Trafford Park near Manchester. They built 812 Proctors of several marks between 1941 and 1945, assembling most of the aircraft at Barton Aerodrome. [2]
Whilst the very early Proctors (Mks I to III) followed very closely the last incarnation of the Vega Gull, and consequently retained most of its performance, later versions became much heavier and less aerodynamic, with inevitable detrimental effects upon their performance. The later marques of Proctor, whilst looking broadly similar, were in fact a complete redesign of the aircraft and were much enlarged, heavier and even less efficient. Flight performance was poor. There were later plans to fit them with the 250 horsepower (190 kW) Queen 30 and a larger airscrew, but only one trial aircraft was so fitted, because the all-metal Prentice was being developed to replace the Proctor, utilising the Queen 30 etc.
The Prentice proved to be a very poor aircraft, even worse than the later Proctors, and they served in the RAF for only a handful of years before being withdrawn. Combining the Vega's good qualities in range, speed, load capacity, and wing-folding,[ citation needed ] the remaining Proctors soldiered on in private hands until the 1960s, when they were all grounded, owing to concerns about the degradation of the glued joints in their wooden airframes.
Several surviving Proctors have been rebuilt with modern adhesives; some, such as G-AKIU [3] and G-ANXR, are airworthy as of the 2010s.
The Proctor was initially employed as a three-seat communications aircraft (Proctor I). This was followed by the Proctor II and Proctor III three-seat radio trainers.
In 1941, the Air Ministry issued Specification T.9/41 for a four-seat radio trainer. The P.31 – originally known as the "Preceptor" but finally redesignated the Proctor IV – was developed for this requirement with an enlarged fuselage. One Proctor IV was fitted with a 250 hp (157 kW) Gipsy Queen engine. This was used as a personal transport by AVM Sir Ralph Sorley but production models retained the 210 hp (157 kW) motor of earlier marks.
At the end of the war, many early mark Proctors were sold on the civilian market and were operated in Australia, New Zealand and Europe. The Mk IV continued in service with the RAF until the last was withdrawn in 1955.
In 1945, a civil model derived from the Proctor IV was put into production for private owner, business and light charter use as the Proctor 5. The RAF purchased four to be used by air attachés.
The final model of the line was the solitary Proctor 6 floatplane sold to the Hudson's Bay Company in 1946.
Three highly modified Percival Proctors, nicknamed the "Proctukas," were produced for the film Battle of Britain as stand-ins for the Ju 87 Stuka. After test flights revealed instability, they were ultimately abandoned and never appeared in the film.
Civil Proctors have been registered in the following countries; Argentina, Australia, Austria, Belgium, Brazil, Canada, Chile, Denmark, Egypt, Finland, France, Germany, Gold Coast, Iceland, India, Ireland, Italy, Kenya, Lebanon, Morocco, New Zealand, Portugal, Rhodesia, South Africa, Southern Rhodesia, Spain, Sweden, Switzerland, Transjordan, Turkey, United Kingdom and United States. [4]
Australia 
Belgium 
Canada 
Czechoslovakia 
Denmark 
France 
Italy 
Jordan 
Lebanon 
Netherlands 
Poland 
Syria 
United Kingdom 
United States 
Data from The Hamlyn Concise Guide to British Aircraft of World War II, [35] British civil aircraft 1919-1972 Volume III [36]
General characteristics
Performance
The Proctor was mentioned in the song "Flying Doctor" by Hawklords (1978)
It was Biggles' main aircraft in the Air Police stories by W.E. Johns
Two Proctors were modified with angular gull wings to resemble Junkers Ju 87 Stukas for the 1969 film Battle of Britain , and were dubbed Proctukas.
Related development
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