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Boulton Paul Sidestrand
The Boulton Paul P.29 Sidestrand was a twin-engine biplane medium bomber of the Royal Air Force. Named after a village on the Norfolk coast near Boulton & Paul's factory in Norwich, the Sidestrand first flew in 1926 and entered service in 1928. It remained in service until 1936, equipping No. 101 Squadron RAF. It was an agile and relatively fast aircraft that was capable of aerobatic manoeuvres such as loops, rolls and spins.〔Taylor 1969, p. 325.〕
==Design and development==
Boulton & Paul Ltd of Norwich built a series of twin-engined biplanes starting with the Bourges of 1918, which although not ordered into production, had demonstrated excellent performance and manoeuvrability, followed by the all-metal Bolton of 1922 and the smaller Bugle of 1923. In 1924, the Air Ministry issued Specification 9/24 for an all-metal, twin engined medium bomber, with an order for two prototypes following early in 1925.〔Jarrett ''Aeroplane Monthly'' November 1994, pp. 19–20.〕〔Mason 1994, p. 180.〕 The first aircraft flew in 1926, piloted by C. A. Rea, Boulton & Paul's first full-time test pilot.〔("Bobolink to Delta, Part III." ) ''Flight'', 8 July 1955, p. 51.〕
The village of Sidestrand, chosen for the aircraft name, was the home of the Secretary of State for Air, Samuel Hoare〔Brew 1993〕 Only 20 Sidestrands were built, the first two being equivalent prototypes, were called the Sidestrand Mk I. Originally intended to be powered by two Napier Lion inline engines, the Mk I was eventually fitted with 425 hp (317 kW) Bristol Jupiter VI radial engines, which also powered the first six production Sidestrands, known as the Sidestrand Mk II. The remaining tweilve aircraft were powered by 460 hp (343 kW) Jupiter VIIFs as the Sidestrand Mk III. The six Mk IIs were re-engined to bring them up to the Mk III specification.〔
The Sidestrand had three open gun positions; nose, dorsal and ventral. There was usually a crew of three; pilot, nose gunner and a gunner for the dorsal or ventral positions, the choice depending on where each aircraft flew in a formation. Armament for each position was a .303 in (7.7 mm) Lewis gun, the gun being moved between the two rear positions as required.〔(Flight 1969 )〕 The Sidestrand bomb-load was limited to , less than contemporaries such as the Tupolev TB-1.〔Taylor 1980, p. 344.〕
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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