Auster AOP.9

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Auster AOP.9
Auster - RIAT 2005 (2531884786).jpg
AOP.9 XR244 at the RIAT 2005
Rolemilitary observation aircraft
Manufacturer Auster Aircraft Limited
First flight19 March 1954
Introduction1955
Primary users Army Air Corps
Royal Air Force, Indian Air Force
Number built182 [1]

The Auster AOP.9 was a British military air observation aircraft ("air observation post") produced by Auster Aircraft Limited to replace the Auster AOP.6.

Contents

Design and development

The Auster AOP.9 was designed as a successor to the Auster AOP.6. Like its predecessor, it was a braced high-wing single engined monoplane with a fixed tailwheel undercarriage. [2] Although having the same general appearance, the AOP.9 was a new design, with larger wing area and a more powerful engine. The wing and tail were metal-skinned, but the fuselage and ailerons were fabric-covered. [2] The fin and rudder assembly were more angular in the new aircraft with a noticeable dorsal fillet. [3] A combination of the more powerful 180 hp (134 kW) Blackburn Cirrus Bombardier engine, larger wings and large flaps gave it an improved take-off and landing performance compared with the AOP.6. It could operate from ploughed fields and muddy surfaces using low pressure tyres and strengthened undercarriage. [4]

The cabin held three seats, pilot and passenger side-by-side and the observer behind, facing either forwards or rearwards. [2] The aircraft was also designed to be convertible into a two-seat light transport with an interchangeable rear floor. [4] In this configuration the observer sat alongside the pilot.

The prototype WZ662 first flew 19 March 1954. [2] Auster Aircraft allotted its model designation B5 to the AOP.9 design. [5]

Operational history

Deliveries started to the Royal Air Force in February 1955, [2] replacing AOP.6s in the regular AOP squadrons, the auxiliary squadrons disbanding in March 1957 before receiving AOP.9s. Until the formation of the Army Air Corps (AAC) in September 1957, Army personnel flew RAF aircraft based in RAF squadrons.

The aircraft were in action with No. 656 Squadron from September 1955, [6] flying an average of 1,200 sorties per month. [7] By the end of Operation Firedog in Malaya on 31 July 1960, 656 Squadron's AOP.6 and AOP.9s had carried out 143,000 sorties. [8]

The AOP.9s were involved in several of Britain's other end of Empire conflicts; 653 Squadron AAC used them in Aden in the early 1960s, flying from Falaise, Little Aden. [9] [10] They stayed in service until 1966 and were the last fixed wing AOP aircraft used by the AAC, [9] though their light transport role was taken over by Beavers.

Formerly XR240, this aircraft now (2008) flies as G-BDFH AOP9-G-bdfh.jpg
Formerly XR240, this aircraft now (2008) flies as G-BDFH

The South African Air Force operated its AOP.9s from 1957 to 1967.

The Army Historic Aircraft Flight maintain an AOP.9 [11] in flying condition at Middle Wallop.

In the 1970s, 19 AOP.9s joined the UK civil register, and in 2008 14 remained, though only about three of these had a current certificate of airworthiness. [12] The sole Beagle E3/Auster AOP.11 G-ASCC was flying [13] until an accident in 2007. [14]

Variants

Auster AOP.9
Only production version, 182 built. [1]
AOP.9 XK417 at the Farnborough Airshow in 1956, this aircraft served No. 652 Squadron RAF Auster AOP.9 XK417 Farnborough 09.56.jpg
AOP.9 XK417 at the Farnborough Airshow in 1956, this aircraft served No. 652 Squadron RAF
Auster AOP.11
Three-seat AOP machine with a 260 hp Continental IO-470-D 6-cylinder horizontally opposed more powerful engine, that raised the maximum speed to 142 mph (228 km/h) and the empty weight to 1,806 lb (816 kg). [15] Apart from the engine, the AOP.11 was almost identical to its predecessor. Early in its career (photo, right), the undercarriage had spats, though these were later removed. [15] Only one, a converted AOP.9 [1] was produced, making its first flight on 18 August 1961 with serial XP254. [16] A year later it was registered to Beagle aircraft, that had taken over Auster in 1960, as G-ASCC where it was known as the Beagle Mk 11, the E.3 or as the A.115. [1] It was sold into private hands in 1971. [13]
Auster 9M
A number of army surplus aircraft were bought by Captain Mike Somerton-Rayner in 1967. One was converted as an Auster 9M with a 180 hp (134 kW) Avco Lycoming O-360-A1D piston engine. [17] The 9M first flew on 4 January 1968, and gained a Certificate of Airworthiness on 30 April 1968 [17] The aircraft was still airworthy in 2009. [18] [19]

Operators

Military operators

Privately owned 1961-built AOP.9 G-AZBU takes off in 2009 Auster aop9 xr246 g-azbu arp.jpg
Privately owned 1961-built AOP.9 G-AZBU takes off in 2009
Flag of Hong Kong 1959.svg  Hong Kong
Flag of India.svg  India
35 aircraft
Flag of South Africa (1928-1982).svg  South Africa
Flag of the United Kingdom.svg  United Kingdom
146 aircraft

Specifications (AOP.9)

Data from [2]

General characteristics

Performance

See also

Related lists

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References

Notes

  1. 1 2 3 4 Simpson 2001 , p. 52
  2. 1 2 3 4 5 6 Bridgman 1956 , pp. 46–47
  3. ↑ Thetford 1957 , pp. 37, 39
  4. 1 2 Thetford 1957 , p. 38
  5. 1 2 Ketley 2005 , p. 83
  6. ↑ Halley 1988 , p. 447
  7. ↑ Ketley 2005 , p. 50
  8. ↑ Thetford 1976 , p. 42
  9. 1 2 3 "Museum of Army Flying". Archived from the original on 2 March 2009. Retrieved 3 June 2009.
  10. ↑ AOP.9 in Aden
  11. ↑ British Army AOP.9 Archived 5 June 2011 at the Wayback Machine
  12. ↑ UK Civil Aviation Authority Aircraft Register Auster AOP.9
  13. 1 2 UK Civil Aviation Authority Aircraft Register G-ASCC
  14. ↑ G-ASCC crash
  15. 1 2 Taylor 1966 , pp. 140–141
  16. ↑ Taylor 1966 , p. 140
  17. 1 2 Jackson 1974 , p. 325
  18. ↑ UK Civil Aviation Authority Aircraft Register G-AVHT (historic) Archived 6 June 2011 at the Wayback Machine
  19. ↑ UK Civil Aviation Authority Aircraft Register G-AVHT (current)
  20. ↑ Halley 2001 , p. 51
  21. ↑ Jefford 1988 , p. 102
  22. ↑ Jefford 1988 , p. 103
  23. ↑ Sturtivant & Hamlin 2007 , p. 297
  24. ↑ Sturtivant & Hamlin 2007 , p. 130
  25. ↑ Sturtivant & Hamlin 2007 , p. 156
  26. ↑ Sturtivant & Hamlin 2007 , p. 173

Bibliography

  • Bridgman, Leonard (1956). Jane's All the World's Aircraft 1956-7. Jane's All the World's Publishing Co. Ltd.
  • Halley, J.J. (1988). The Squadrons of the Royal Air Force 1918–1988. Air-Britain (Historians) Ltd. ISBN   0-85130-164-9.
  • Halley, J.J. (2001). Royal Air Force Aircraft. Air-Britain (Historians) Ltd. ISBN   0-85130-311-0.
  • Jackson, A.J. (1974). British Civil Aircraft since 1919 Volume 1. London: Putnam. ISBN   0-370-10006-9.
  • Jefford, C.G. (1988). RAF Squadrons. Airlife Publishing Ltd. ISBN   1-85310-053-6.
  • Ketley, Barry (2005). Auster – A brief history of the Auster aircraft in British military service. Flight Recorder Publications. ISBN   0-9545605-6-6.
  • Simpson, Rod (2001). Airlife's World Aircraft. Shrewsbury: Airlife Publishing Ltd. ISBN   1-84037-115-3.
  • Sturtivant, Ray; Hamlin, John (2007). Royal Air Force flying training and support units since 1912. Tonbridge, UK: Air-Britain (Historians). ISBN   978-0851-3036-59.
  • Taylor, J.W.R. (1966). Jane's All the World's Aircraft 1966-7. Great Missenden: Sampson Low, Marsden & Co. Ltd.
  • Thetford, Owen (1957). Aircraft of the Royal Air Force 1919–57. London: Putnam.
  • Thetford, Owen (1976). Aircraft of the Royal Air Force since 1918. Putnam & Company Ltd. ISBN   0-370-10056-5.
  • The Illustrated Encyclopedia of Aircraft (Part Work 1982–1985). Orbis Publishing.

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