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"Avro" was short for A.V. Roe & Co., Ltd., of Manchester and Hamble. A. V. Roe's planes may have only played a small direct part in the history of WWI air combat, but the 504 played a larger part as a trainer, and of course (unlike many of its contemporaries) the Avro firm had a history lasting long after World War One.[1] 8340 504s were produced during the war.[2]

Aircraft from the Great War or shortly thereafter include:


  1. Ten 504Es were built and used as trainers.[3]
  2. The 504F was an experimental version with a 75hp Rolls-Royce Hawk engine. Production was not undertaken, as it was underpowered.[3]
  3. The 504G was a gunnery trainer version of the 504B.[3]
  4. The 504H was a converted 504C used in RNAS experimentation with catapult launches from ships.[3]
  5. The 504J was a widely-used trainer which appeared in the autumn of 1916. Many were converted to 504Ks.[3]
  1. Bruce, p.36
  2. Bruce, p.53.
  3. 3.0 3.1 3.2 3.3 3.4 Bruce, pp.39-55.
  • 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.