• Source: Armstrong Whitworth F.K.8

      • The Armstrong Whitworth F.K.8 was a British two-seat general-purpose biplane built by Armstrong Whitworth during the First World War. The type served alongside the better known R.E.8 until the end of the war, at which point 694 F.K.8s remained on RAF charge.


      Design and development


      The aircraft, originally designated the F.K.7, was designed by Dutch aircraft designer Frederick Koolhoven as a replacement for the Royal Aircraft Factory B.E.2c and the Armstrong Whitworth F.K.3. It was a sturdier aircraft than the F.K.3, with a larger fuselage and wings, and was powered by a 160 hp (110 kW) Beardmore water-cooled engine. The undercarriage used oleo shock absorbers and the observer was equipped with a Scarff ring mounting for a .303 in (7.7 mm) Lewis machine gun. No armament was initially provided for the pilot. The rudder featured a long, pointed horn-balance. The type was fitted with basic dual controls for the observer to control the aircraft if the pilot became incapacitated.

      The first example, A411, flew in May 1916 and was delivered to the Royal Flying Corps Central Flying School at Upavon on 16 June. Because its rival, the Royal Aircraft Factory R.E.8 was an unknown quantity, it was decided that fifty of the Armstrong Whitworth design, renamed the F.K.8., would be ordered for the RFC.
      The production aircraft were identical in most respects to A411, with the addition of a forward-firing .303 in (7.7 mm) Vickers machine gun to port of and slightly behind the engine. The Armstrong Whitworth gun synchronising mechanism was incomplete at the time the first example A2636 arrived in France and some early production F.K.8s may have used the Arsiad interrupter gear instead. The Armstrong Whitworth mechanism (like other early mechanical synchronising systems) proved unreliable and was later replaced by the Constantinescu gear. From the fifth production aircraft, the rudder balance was shortened and the shape of the fin was modified.

      The type had several teething troubles: the oleo undercarriage was unable to withstand rough use on the front line airfields, tail skids frequently broke and the original radiators blocked up quickly. Following instructions issued on 30 April 1917, some F.K.8s were refitted with simplified vee-undercarriages from Bristol F.2 Fighters. This soon led to a temporary shortage of these undercarriages and the practice had to be discontinued until May 1918, after which several F.K.8s were fitted with revised undercarriages. Most production F.K.8s had modifications to the wings, gunner's seat and the exhaust system. The tall inverted vee radiators incorporated improved tubes which reduced the blockages. On later aircraft the nose cowling was redesigned and smaller box radiators were standardised.
      In service the F.K.8 (nicknamed the "Big Ack") proved to be effective and dependable, being used for reconnaissance, artillery spotting, ground-attack, contact-patrol and day and night bombing. It was reputedly easier to fly than the R.E.8 and was sturdier but its performance was even more pedestrian and it shared the inherent stability of the Royal Aircraft Factory types. While the pilot and observer were placed reasonably close together, communication between the two lacked the "tap on the shoulder" intimacy of the Bristol Fighter (or the R.E.8 for that matter).
      The F.K.13 seems to have been the name of a reconnaissance version of the F.K.8 but it may have been no more than a project. A total of 1,650 of the standard F.K.8 were built.


      Operational history



      The first squadron to take the type to France was 35 Squadron RFC, in January 1917. The type eventually served with several squadrons on operations in France, Macedonia, Palestine and for home defence, proving more popular in service than its better known contemporary the R.E.8. The F.K.8 was principally used for corps reconnaissance but was also used for light bombing, being capable of carrying up to six 40 lb (20 kg) phosphorus smoke bombs, up to four 65 lb (29 kg) bombs or two 112 lb (51 kg) bombs on underwing racks.
      Two Victoria Crosses were won by pilots of F.K.8s; one by Second Lieutenant Alan Arnett McLeod of No. 2 Squadron RFC, on 27 March 1918 and the second by Captain Ferdinand Maurice Felix West of No. 8 Squadron RAF on 10 August 1918.
      In 1918 operators in aircraft Nos. 5082 & 5117, under the charge of Captain Tate, R.A.F., controlled unmanned boats by radio through obstacles in trials at Dover.
      With the R.E.8, the F.K.8 was scheduled to be replaced for corps reconnaissance by a version of the Bristol Fighter with a Sunbeam Arab engine. Unfortunately the engine was unsatisfactory and this version of the Bristol never saw service. Like the R.E.8, the F.K.8 was quickly discarded with the end of the war – the last squadron, No. 150 Squadron RAF, being disbanded at Kirec in Greece on 18 September 1919.
      One F.K.8 was purchased by a pilot named Sydney Stewart in the early 1920s, who took the aircraft to Buenos Aires and gave flying lessons. There he met Francisco Cusmanich, a Paraguayan pilot. Stewart and Cusmanich offered their services to the Paraguayan government during the Revolution of 1922. The F.K.8 was taken to Paraguay by ship and called "Presidente Ayala" in honor of the President of Paraguay, Dr. Eusebio Ayala. Both pilots flew several reconnaissance and light bombing sorties over the rebel positions. In one of those sorties, the F.K.8 was hit several times with ground fire causing an explosion on board, killing Stewart and Cusmanich instantly.


      Civil service


      Eight aircraft were civil-registered after the war with two aircraft being used in Australia by the Queensland and Northern Territory Aerial Services (later QANTAS, then Qantas Airways Ltd.).


      Operators




      = Civil operators

      =
      Australia
      QANTAS


      = Military operators

      =
      Kingdom of Hejaz
      Hejaz Air Force – The Kingdom of Hejaz received two F.K.8s in 1921, at least one remaining in existence until 1923.
      Paraguay
      Paraguayan Army
      United Kingdom
      Royal Flying Corps / Royal Air Force
      Western Front:

      2 Squadron RFC
      8 Squadron RFC
      10 Squadron RFC
      35 Squadron RFC
      82 Squadron RFC
      Headquarters Communication Squadron RFC
      Home Defence:

      36 Squadron RFC
      39 Squadron RFC
      50 Squadron RFC
      Macedonia:

      17 Squadron RFC (part)
      47 Squadron RFC (part)
      Palestine:

      142 Squadron RFC
      Training:

      3 Training Squadron RFC
      15 Training Squadron RFC
      31 Training Squadron RFC
      39 Training Squadron RFC
      50 Training Squadron RFC
      57 Training Squadron RFC
      61 Training Squadron RFC
      110 Training Squadron RFC
      127 Training Squadron RFC
      1 Training Depot Station RFC


      Specifications (F.K.8)


      Data from Armstrong Whitworth Aircraft since 1913General characteristics
      Crew: 2
      Length: 31 ft 5 in (9.58 m)
      Wingspan: 43 ft 6 in (13.26 m)
      Height: 10 ft 11 in (3.33 m)
      Wing area: 540 sq ft (50 m2)
      Empty weight: 1,916 lb (869 kg)
      Gross weight: 2,811 lb (1,275 kg)
      Fuel capacity: 50 imp gal (60 US gal; 230 L)
      Powerplant: 1 × Beardmore 160 hp water-cooled six-cylinder inline engine
      Performance

      Maximum speed: 95 mph (153 km/h, 83 kn) at sea level
      Endurance: 3 hr
      Service ceiling: 13,000 ft (4,000 m)
      Time to altitude: 15.4 min to 6,500 ft (2,000 m)
      Armament

      Guns: 1 × fixed, forward firing .303 in Vickers machine gun and 1 × flexibly mounted .303 in Lewis gun
      Bombs: up to 260 lb (118 kg) bombs


      See also



      Related development

      Armstrong Whitworth F.K.3
      Aircraft of comparable role, configuration, and era

      Breguet 14
      Royal Aircraft Factory B.E.2
      Royal Aircraft Factory R.E.8
      Rumpler C.I


      Notes




      Bibliography


      Andersson, Lennart (July–August 2004). "Wings Over the Desert: Aviation on the Arabian Peninsula: Part One Saudi Arabia". Air Enthusiast. No. 112. pp. 39–43. ISSN 0143-5450.
      Bruce, J. M. (1982). The Aeroplanes of the Royal Flying Corps (Military Wing). London: Putnam and Company. ISBN 0-370-30084-X.
      Hagedorn, Dan; Sapienza, Anonio L. (1997). Aircraft of the Chaco War 1928–1935. Algen, Pennsylvania, USA: Schiffer Publishing. ISBN 0-7643-0146-2.
      Mason, Francis K. (1994). The British Bomber Since 1914. London: Putnam Aeronautical Books. ISBN 0-85177-861-5.
      Munson, Kenneth (1967). Aircraft of World War I. London: Ian Allan. ISBN 0-7110-0356-4.
      Tapper, Oliver (1988). Armstrong Whitworth Aircraft since 1913. London: Putnam. ISBN 0-85177-826-7.


      Further reading



      Taylor, John W. R. (1969). "Armstrong Whitworth F.K.8.". Combat Aircraft of the World from 1909 to the present. New York: G.P. Putnam's Sons. ISBN 0-425-03633-2.
      Prins, François (Spring 1994). "Pioneering Spirit: The QANTAS Story". Air Enthusiast. No. 53. pp. 24–32. ISSN 0143-5450.
      Sapienza, Antonio Luis (April 1999). "Le role de aviation lors de la révolution de 1922 au Paraguay" [The Role of Aircraft during the 1922 Paraguayan Revolution]. Avions: Toute l'aéronautique et son histoire (in French) (73): 24–26. ISSN 1243-8650.

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