The Fairey Rotodyne was a 1950s British compound gyroplane designed and built by Fairey Aviation and intended for commercial and military uses. After a series of political arguments, proposals, and bargaining; in December 1956, HM Treasury authorised work on both the Rotodyne and Eland engine to be continued until the end of September 1957. Amongst the demands exerted by the Treasury were that the aircraft had to be both a technical success and would need to acquire a firm order from BEA; both Fairey and English Electric (Napier's parent company) also had to take on a portion of the costs for its development as well. Despite the strenuous efforts of Fairey to achieve its support, the expected order from the RAF did not materialise — at the time, the service had no particular interest in the design, being more focused on effectively addressing the issue of nuclear deterrence.

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