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The manufacturing firm W.G. Armstrong, Whitworth & Co, Ltd. of Newcastle-on-Tyne hired Dutch designer Frederick Koolhoven as their chief designer,. This led to a pair of robust, underappreciated two-seater F.K. aeroplane designs. The aircraft division of the company did not last long after the war, closing in late 1919.[1][2]

Production Aircraft

Aircraft from the Great War or shortly thereafter include:



  1. The FK1 was a prototype 1914 biplane.[1]
  2. The FK10 was a quadriplane two-seater. Four prototypes were built in 1917, but it was not selected for production.[3]
  3. As if four wings were not enough, the FK11 took an FK10 fuselage and mounted fifteen narrow-chord staggered wings.[4]
  4. The FK12 was an awkward-looking triplane multiseat escort that was abandoned due to performance problems.[5]
  5. The FM4 was a bulky prototype single-seat fighter from autumn 1918 that was not produced.[6]
  6. The Ara was an elegant fighter that did not fly until 1919. It was doomed by the failure of the A.B.C. Dragonfly radial engine.[7]
  1. 1.0 1.1 Bruce'69, p.10.
  2. Bruce'69, p.29.
  3. Bruce'69, pp.21-24.
  4. Bruce'69, p.24.
  5. Bruce'69, pp.25-26.
  6. Bruce'69, pp.26-28.
  7. Bruce'69, pp.28-29.
  • J.M. Bruce. British Aeroplanes 1914-18. Great Britain, Funk & Wagnalls, 1957, 1969. ISBN 0370000382
  • W.M. Lamberton and E.F. Cheesman, Reconnaissance & Bomber Aircraft of the 1914-1918 War. Great Britain: Harleyford Publications Ltd., 1962. ISBN 9780900435027