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SIAI S.52
The SIAI S.52 was an Italian fighter prototype of 1924.
==Design and development==
In 1919, Alessandro Marchetti (1884–1966) designed the Marchetti MVT fighter, renamed the SIAI S.50 in 1922 when Marchetti joined the SIAI company as its chief designer. SIAI entered the S.50 in the 1923 ''Regia Aeronautica'' (Italian Royal Air Force) fighter contest, even though the S.50 was powered by a 212-kilowatt (285-horsepower) SPA 62a six-cylinder engine instead of the 224-kilowatt (300-horsepower) Hispano-Suiza HS 42 eight-cylinder water-cooled engine required by the Italian Air Ministrys specification for entrance in the contest. Despite this, the S.50 attracted enough ''Regia Aeronautica'' interest to prompt it to acquire three S.50 fighters from SIAI for evaluation, although a proposal to order twelve S.50 aircraft never bore fruit.〔Green and Swanborough, pp. 362, 526–527.〕
Marchetti decided to design a derivative of the S.50 powered by the HS 42 engine for entry in the 1923 fighter contest. The resulting S.52 was a single-seat, all-metal biplane with its fuselage suspended between the upper and lower wings. The after part of the fuselage itself was flattened to serve as an airfoil. The semi-elliptical wings were extremely thin in section and larger in area than those of the S.50, and used ailerons to allow lateral control rather than the wing warping the S.50 employed. The S.50s all-moving tail surfaces were replaced in the S.52 by a conventional tail unit which combined fixed and moving surfaces. The engine drove a two-bladed propeller, and the S.52 was armed with two fixed, forward-firing 7.7-millimeter (0.303-inch) Vickers machine guns synchronized to fire through the propeller.〔Green and Swanborough, p. 526–527.〕
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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