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PZL-101 Gawron
The PZL-101 Gawron ((英語:Rook)) is a Polish agricultural and utility aircraft designed and built by WSK-Okęcie (later PZL "Warszawa-Okęcie").
==Design and development==
The PZL-101 was a development of the Yakovlev Yak-12M, manufactured in Poland under licence from 1956. The main goal was to create an agricultural aircraft with increased useful load. Works were carried out by a team led by Stanisław Lassota. Behind two crew seats there was installed a container for 500 kg of chemicals, with a "hump" above a fuselage. Because a center of gravity moved rearwards, the plane was fitted with new, swept wings, with significant vertical end plates to improve air flow. Later, in most of the aircraft they were removed, because they increased side surface, making landing very tricky in crosswind. Main landing gear was also shifted rearwards, comparing with Yak-12. An equipment was simplified and lightened to increase useful load more, e.g. a right door was removed.
The first prototype flew on April 14, 1958, and the production of the PZL-101 started in 1960. From 1962 the PZL-101A variant was produced, with improved equipment, pilot's seat raised and a right-side door added. From 1965 a further improved PZL-101B was produced. Visible changes were: lack of "hump" above the fuselage and a bigger air intake below engine. Apart from agricultural planes, there were made four-seater utility planes and air ambulances. Until production end in 1968, 325 planes were manufactured, including 215 agricultural ones, 78 utility ones and 32 air ambulances.
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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