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The Bristol Type 163 Buckingham was a British Second World War medium bomber for the Royal Air Force (RAF). Overtaken by events, it was built in small numbers, and was used primarily for transport and liaison duties. ==Design and development== In early 1939 Bristol suggested a bomber variant of the Beaufighter with their Hercules engines. British policy at the time was for medium bombers to be provided from the US allowing British industry to concentrate on heavy bomber designs but a design was requested preferably based on an existing design which meant working with the Beaufighter or Beaufort. Bristol worked on their design first as the Bristol Type 161 then the Type 162 Beaumont.〔Buttler 2004, p. 88.〕 Air Ministry specification B.7/40 called for a medium bomber to replace the Blenheim. The specification stipulated a speed of at least 300 mph with a normal load of 1,000 lb of bombs and a turret armed with at least two machine guns of 0.50 inch calibre. Only one manufacturer tendered a full design but it did not meet with approval.〔Buttler 2004, p. 87.〕 Bristol then brought their Type 162 to the Air Staff, which was fortunately well matched to B.7/40, which led to a request for a mock-up and then a contract for three prototypes in late 1940. The Beaumont was based on the rear fuselage and tail of a Beaufighter, with a new centre and front fuselage. The armament was a mid-upper turret with four machine guns, four more machine guns firing forward and two firing to the rear. Construction began in late 1940, with a new Air Ministry Specification B.2/41 to be written around it. Changes in the requirements, removing dive bombing and "direct army support" which incoming US bombers were expected to be capable of and increasing the performance to allow for the future, meant the Beaumont would no longer suffice. The changes in performance (requiring a bomb load of 4,000 lb, a speed of 360 mph and a range of 1,600 miles) meant a redesign by Bristol to use the Bristol Centaurus engine.〔 The Bristol redesign with a larger wing and the more powerful engines was the Type 163 Buckingham.〔 It had gun installations in the nose, dorsal and ventral turrets. Generally conventional in appearance, one unusual feature was that the bomb-aimer/navigator was housed in a mid-fuselage ventral gondola, resembling those on the earlier German Heinkel He 111H and American Boeing B-17C and -D in appearance.〔Winchester 2005, p. 95.〕 This was part of an attempt to give all the crew positions unobstructed views and access to each other's positions. The bomb bay could hold a 4,000 lb, two 2,000 lb, four 1,000 lb or six 500-lb bombs.〔''Flight'' 13 December 1945, p. 625.〕 The rear of the gondola had a hydraulically powered turret with two 0.303 Browning machine guns. The Bristol-designed dorsal turret carried four Brownings. A further four fixed, forward-firing Brownings were controlled by the pilot.〔 Following more changes specification B.2/41 was replaced by B.P/41. The first flight took place on 4 February 1943.〔Mondey 1994, p. 68.〕 During testing, the Buckingham exhibited poor stability which led to the enlargement of the twin fins, along with other modifications.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bristol Buckingham」の詳細全文を読む スポンサード リンク
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