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Rogožarski SIM-XI
The Rogožarski SIM-XI (Serbian Cyrillic: Рогожарски СИМ-XI) was a single-seat, single-engine trainer monoplane built in the Kingdom of Yugoslavia in 1938. It was designed and built at the Rogožarski factory in Belgrade.
==Design and development==
When examining the earlier SIM-X, it was observed that it had aerobatic characteristics, so the factory management decided to install a more powerful engine with a carburetor for inverted flights, reduce the lower wing struts, reduce the wing area and make the construction more flexible to give a more aerobatic aircraft. The renowned Yugoslav engineer Sima Milutinović was consulted in 1937 to implement the necessary changes. The first test flight was by factory test pilot Captain Milan Bjelanović in January 1938. Starting March 12, 1938, tests were conducted by the Yugoslav Royal Air Force. The plane got excellent grades and the YRAF bought the prototype SIM-XI.〔Јанић, Чедомир (28. мај.1982). "Акробатски авион Сим-XI" (in (Serbian)). Фронт (YU-Београд: Narodna armija) Бр.1224〕
The SIM-XI was a monoplane with a single carbureted 150 hp Siemens (Bram) Sh14a, engine. The plane was of mostly wooden structure, with an elliptical cross-section of fuselage made entirely of wood covered with plywood, and wooddn wings covered with cloth, with rounded ends. On each side, the wings were supported by a pair of inclined struts attached to the fuselage. The aircraft had two fuel tanks, one located at the junction of the wings, the other in the fuselage. The fuselage tank was filled for aerobatics, and the wing tank was filled for normal flights. Both tanks were filled during flights when it was needed to travel greater distances. The landing gear was fixed, completely made of steel tubes, which were strong enough for the plane to be able to land on rugged terrain.〔Станојевић, Драгољуб.; Чедомир Јанић (12/1982.). "Животни пут и дело једног великана нашег ваздухопловства - светао пример и узор нараштајима" (in (Serbian)). Машинство (YU-Београд: Савез инжењера и техничара Југославије) 31: 1867 - 1876.〕〔Петровић, Огњан М. (3/2004.). СИМ XII-Х. "Војни аероплани Краљевине СХС/Југославије (Део II: 1931–1941.)" (in (Serbian)). Лет - Flight (YU-Београд: Музеј југословенског ваздухопловства) 3: 58-59. ISSN 1450-684X〕
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