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The Bristol F.2 Fighter was a British two-seat biplane fighter and reconnaissance aircraft of the First World War flown by the Royal Flying Corps. It is often simply called the Bristol Fighter or popularly the "Brisfit" or "Biff". Despite being a two-seater, the F.2B proved to be an agile aircraft that was able to hold its own against opposing single-seat fighters. Having overcome a disastrous start to its career, the F.2B's solid design ensured that it remained in military service into the 1930s, and surplus aircraft were popular in civil aviation. ==Design and development== The Bristol fighter's basic design stemmed from design studies by Frank Barnwell in March 1916 for an aircraft intended, like the R.E.8 and the F.K.8, as possible replacements for the B.E.2c – the Type 9 R.2A with the 160 hp Beardmore engine and the R.2B, powered by the 150 hp Hispano Suiza.〔Bruce 1965, p. 97.〕 Neither type was built, as the new 190 hp (142 kW) Rolls-Royce Falcon inline engine became available, and Barnwell designed a new aircraft around the Rolls-Royce engine. This, the Type 12 F.2A was a more compact design, intended from the outset as a replacement for the F.E.2d and Sopwith 1½ Strutter two-seat fighters: it first flew on 9 September 1916.〔Barnes 1964, p. 106.〕 The F.2A was armed in what had by then become the standard manner for a British two-seater: one synchronised fixed, forward-firing .303 in (7.7 mm) Vickers machine gun, and one flexible .303 in (7.7 mm) Lewis Gun mounted on a Scarff ring in the observer's rear cockpit. This remained the standard armament. Only 52 F.2As were produced before production switched to what became the definitive Bristol Fighter, the Bristol Type 14 F.2B which had first flown on 25 October 1916. The first 150 or so were powered by the Falcon I or Falcon II engine but the remainder were equipped with the 275 hp (205 kW) Falcon III engine and could reach a maximum speed of 123 mph (198 km/h). The F.2B was over 10 mph (16 km/h) faster than the F.2A and was three minutes faster at reaching 10,000 ft (3,000 m). F.2Bs often carried a second Lewis gun on the rear cockpit mounting, although observers found the weight of the twin Lewis gun mounting difficult to handle in the high altitudes at which combat increasingly took place in the last year of the war. A number of attempts were made to add forward firing Lewis guns on a Foster mounting or similar on the upper wing - either instead of, or in addition to the Vickers gun. Unfortunately this caused interference with the pilot's compass, which was mounted on the trailing edge of the upper wing. Some F.2Bs were fitted with a Lewis gun offset to starboard to minimise this effect.〔Bruce ''Air Enthusiast'' Thirty-five, pp. 43–45.〕 The Bristol M.R.1 is often described as an "all-metal version of the F.2b". In fact it was a totally new design – although it shared the characteristic of having the fuselage positioned between the upper and lower wing. Two prototypes were built, the first flying on 23 October 1917, but the M.R.1 never entered mass production. 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 F.2 Fighter」の詳細全文を読む スポンサード リンク
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