Rogožarski SIM-VI
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The Rogožarski SIM-VI (
Serbian Cyrillic The Serbian Cyrillic alphabet (, ), also known as the Serbian script, (, ), is a standardized variation of the Cyrillic script used to write the Serbian language. It originated in medieval Serbia and was significantly reformed in the 19th cen ...
:Рогожарски СИМ-VI) was a single-engined, two-seat, low wing aircraft designed as trainer in Yugoslav before
World War II World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...
. It was designed and built at the Rogožarski factory in Belgrade.


Design and development

The SIM-VI was designed by engineer Sima Milutinović in the early 1930s as an inexpensive trainer plane that would enable expansion of sports aviation. The project was in suspension until 1936, when a prototype was constructed, and the maiden flight was made in 1937. The aircraft was a low wing
monoplane A monoplane is a fixed-wing aircraft configuration with a single mainplane, in contrast to a biplane or other types of multiplanes, which have multiple wings. A monoplane has inherently the highest efficiency and lowest drag of any wing con ...
of fabric-covered wooden structure. A four-cylinder 50 hp
Walter Mikron The Walter Mikron is a four-cylinder, air-cooled, inverted straight engine for aircraft. Development Developed in Czechoslovakia in the early 1930s, the engine saw limited use in late 1930s and early 1950s. In the 1980s an initial batch of engi ...
engine drove a two-bladed wooden propeller. The plane had tandem seating and was intended for civilian use, for the training of sports pilots, demonstration flights and travel. The wings were of thin profile, only 6% of trapezoidal shape with rounded ends. On each side, the wings were stretched with molded wire ties.


Variants

*Rogozarski SIM-VI – with 37 kW
Walter Mikron The Walter Mikron is a four-cylinder, air-cooled, inverted straight engine for aircraft. Development Developed in Czechoslovakia in the early 1930s, the engine saw limited use in late 1930s and early 1950s. In the 1980s an initial batch of engi ...
engine *Rogozarski SIM-VI-a – with 44 kW
Walter Mikron The Walter Mikron is a four-cylinder, air-cooled, inverted straight engine for aircraft. Development Developed in Czechoslovakia in the early 1930s, the engine saw limited use in late 1930s and early 1950s. In the 1980s an initial batch of engi ...
II engine Immediately after completing the flight tests of aircraft SIM-VI, engineer Milutinovic undertook the repair of the shortcomings he had observed, so that by the end of the 1937 Rogozarski had a new variant of this airplane which was designated SIM-VI-a. It had a more powerful engine
Walter Mikron The Walter Mikron is a four-cylinder, air-cooled, inverted straight engine for aircraft. Development Developed in Czechoslovakia in the early 1930s, the engine saw limited use in late 1930s and early 1950s. In the 1980s an initial batch of engi ...
II 44 kW (60 hp). An increase in engine power required strengthening of the basic structure which Milutinovic used to make general improvements to the aircraft. Wing relative thickness was increased from 6% to 15% which strengthened the wings, and resulting in the removal of wire ties. Now the wings were covered with cardboard to the half swing instead of cloth which resulted in an improved overall stiffness of the aircraft. This also enabled the landing gear and aerodynamic characteristics of new aircraft to be upgraded, while the weight was only slightly increased.


Operational history

After successful testing and registration (YU-PDX) the SIM-VI was bought by the Central Administration of the Aero Club, which used the it at airshows and for the training of sport pilots. The aircraft did not enter serial production because it could not be used at smaller and under-equipped airports that existed in central Serbia. Flight tests that were carried out at the
Zemun Zemun ( sr-cyrl, Земун, ; ) is a Subdivisions of Belgrade, municipality in the city of Belgrade, Serbia. Zemun was a separate town that was absorbed into Belgrade in 1934. It lies on the right bank of the Danube river, upstream from downtown ...
airfield proved that the SIM-VI-a had slightly better performance than its predecessor, and was able to perform basic stunts. After being granted a navigation license the plane was registered under civil designation YU-PEZ and it was bought by Aero Club's Central Administration. The plane was used until the beginning of the war in 1941 at air shows, sports competitions and for pilot training. Pilot and engineer Arsenijevic, piloted this plane at the competition
Little Entente The Little Entente was an alliance formed in 1920 and 1921 by Czechoslovakia, Romania and the Kingdom of Serbs, Croats and Slovenes (Yugoslavia from 1929 on) with the purpose of common defense against Hungarian revisionism and the prospect of ...
states in 1938. during the competition the plane flew some 3,274 km (2,034.37 miles) achieving an average speed of . Pilots who flew the plane felt that the plane was agile and easy to operate and fly, but despite good features and relatively low cost, SIM-VI did not go into serial production it could not win over the traditional empirical approach (a robust and powerful aircraft is a good aircraft). Right before the outbreak of war, the aircraft was included into the
Yugoslav Royal Air Force The Royal Yugoslav Air Force ( sh-Latn, Jugoslovensko kraljevsko ratno vazduhoplovstvo, JKRV; sh-Cyrl, Југословенско краљевско ратно ваздухопловство, ЈКРВ; (, JKVL); lit. "Yugoslav royal war aviatio ...
, deployed as a signalling plane but was destroyed during the bombing of
Lazarevac Lazarevac ( sr-cyr, Лазаревац, ) is a municipality of the city of Belgrade. , the town has a total population of 27,635 inhabitants, while the municipal area has a total of 55,146 inhabitants. Its name stems from the name of medieval Ser ...
airfield on 7 April 1941.


Operators

; *Aero Club 2 aircraft *
Yugoslav Royal Air Force The Royal Yugoslav Air Force ( sh-Latn, Jugoslovensko kraljevsko ratno vazduhoplovstvo, JKRV; sh-Cyrl, Југословенско краљевско ратно ваздухопловство, ЈКРВ; (, JKVL); lit. "Yugoslav royal war aviatio ...
– One aircraft was impressed into military service in April 1940.


Specifications


See also


Notes


References

* *Д. Лучић: Основи практичне аеродинамике са описима аероплана, Библиотека „Ваздухопловног Гласника“, Нови Сад, 1936, *О. Петровић., Војни аероплани Краљевине СХС/Југославије (Део II: 1931–1941.), Лет 3/2004. Београд, 2004. *Станојевић, Драгољуб.; Чедомир Јанић (12/1982.). "Животни пут и дело једног великана нашег ваздухопловства – светао пример и узор нараштајима". Машинство 31: стр. 1870–1871. *


External links


www.goldenyears.ukf.net
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