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Bristol Type 143
The Bristol Type 143 was a British twin-engine monoplane aircraft designed by Frank Barnwell of the Bristol Aeroplane Company.
Developed alongside the more famous Bristol Type 142, which was developed into the Blenheim, using the same wing design and employing the same the advanced (for the day) design features such as stressed skin, flaps, and retractable undercarriage, the engine it was designed to use never entered production and only a single prototype was manufactured,
==Design and development==
Like the better-known Type 142 the Type 143 arose from the unbuilt Bristol Type 135 proposal for a civil twin-engine light transport aircraft. This was a low-wing twin-engined monoplane, seating six people and a crew of two first sketched out by Frank Barnwell, with the intention of using the smaller of the two engines then being developed by Roy Fedden, the Aquila I. Although the manufacture of a second Aquila was authorised, nothing was done about the construction of an actual airframe.〔Barnes 1964, p. 257.〕 Meanwhile in early 1934 Lord Rothermere announced his intention to have 'the fastest civil aircraft in Europe' built for him.〔 Barnwell proposed an aircraft based on the type 135 but using the more powerful Mercury engine in place of the Aquila, and this was accepted by Rothermere, the aircraft being ordered on 26 March 1934 and first flying on 12 April 1935.〔Barnes 1964, pp. 257–258.〕
The Type 143 was very similar to the Type 135 design, although the cabin was enlarged to seat eight and some detail changes were made to optimise the use of common components with the Type 142: over 70% of components were shared.〔Barnes 1964, p. 258.〕 The prototype 143 was accordingly built alongside the Type 142, receiving the civil registration G-ADEK on 22 March 1935 but had to wait until the end of the year before the engines had completed trials. It was first flown on 20 Jan 1936 without registration but bearing the mark R 14.〔Barnes 1964, pp. 259–260.〕 Further flying continued at Filton, mainly as a test-bed for the Aquila. It was put into store when Aquila development was abandoned in 1938 and subsequently scrapped.〔Barnes 1964, pp. 260–261.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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