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In page Bristol Bullpup:
"The prototype first flew on 28 April 1928, powered by a Bristol Jupiter engine since a flight-ready Mercury was not yet available, and the aircraft was not delivered to Martlesham Heath for evaluation until March 1929.[1] The Bullpup prototype was subsequently fitted with a Jupiter F type head with twin compensator rods for the penthouse heads. Trials with this engine were carried out at Martlesham in 1929.[2]
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