The prototype was sent to Martlesham Heath in June–July 1917 for official testing, and official reports declared that the F.B.25 had poor control characteristics, being "very dangerous" with the engine off, and "almost unmanageable in a wind over 20 miles per hour".
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In order to prove the design, Griffith and several other engineers at the Royal Aircraft Establishment built a testbed example of the compressor in 1928 known as Anne, the machinery being built for them by Fraser and Chalmers.
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Incidentally, Metrovick had recently merged with British Thomson-Houston, another turbine builder who were supporting Whittle's efforts.