Background
The design of the Bulldog was the outcome of a series of design studies for fighter undertaken by Frank Barnwell during the 1920's. In 1924 Barnwell had started work on a fighter powered by the Rolls-Royce Falcon to meet the requirements of specification F.17/24. The project was shelved since Bristol preferred to use their own engine designs, but was revived in 1926 when Barnwell started work on a design, designated the Bristol 102, to meet either F.9/26 for a day and night fighter or N.21/26 for a shipborne fighter. The Type 105 designation was first applied to a subsequent proposal for another aircraft to meet F.9/26 powered by the Mercury engine then under development at Bristol. These proposals looked promising enough for a pair of mock-ups to be constructed for inspection by the Air Ministry in February 1927. The two aircraft were similar in design, the interceptor to specification F.17/24 design being slightly smaller and lighter and not equipped with radio. As a result Bristol were asked to revise the design so that it met a late interceptor specification, F.20/27. Subsequently, a prototype aircraft, now designated the Type 107 Bullpup was ordered for evaluation, but the other design did not gain official backing. Nevertheless Bristol considered it promising enough to build a prototype to be entered for the F.9/26 trials as a private venture, powered by a Bristol Jupiter because the supply of Mercurys was expected to be limited.
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