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PWS-6
The PWS-6, was a Polish liaison aircraft, developed in 1930 by the PWS (''Podlaska Wytwórnia Samolotów'' – Podlasie Aircraft Factory), that remained a prototype.
==Design and development==
The PWS-6 was a successor of an earlier liaison aircraft design, the PWS-5, which was not accepted for mass production. The designers, Aleksander Grzędzielewski and Augustyn Bobek-Zdaniewski, utilized the experience they had gained on PWS-11 and PWS-12 trainers, and as a result the new plane had improved aerodynamics, an oval shaped fuselage section and rounded wingtips. The layout of wings and their bracing were similar to the PWS-5, as was the engine and fixed undercarriage, while the front of the fuselage and the empennage was similar to a final variant of the PWS-12. It was the first Polish aircraft fitted with slats.〔Glass (1977), pp. 182–183.〕
The design was produced in 1929–1930 and a scale-model of the aircraft was tested in the wind-tunnel. The prototype was built on the factory's own initiative and first flew in late 1930 in Biała Podlaska, piloted by Franciszek Rutkowski. In 1931 it was tested in the Aviation Technical Research Institute (ITBL) in Warsaw. It was evaluated as much better than the PWS-5, with better performance, good handling and a short landing. However, the aircraft was not produced, because the Polish Air Force had just ordered a production of the Lublin R-XIII aircraft.〔
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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