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PWS-11
The PWS-11 was a Polish aerobatic and trainer aircraft, developed in 1928-1929 by PWS (''Podlaska Wytwórnia Samolotów'' - Podlasie Aircraft Factory), which remained a prototype.
==Design and development==
In parallel with development of a fighter aircraft, the PWS-10, the design team of Aleksander Grzędzielewski and Augustyn Bobek-Zdaniewski from the PWS factory, started work on an intermediate aircraft for training fighter pilots. Like the PWS-10, the new plane was of a parasol wing configuration, but the shape of the fuselage, wings and empennage were similar to a liaison aircraft, the PWS-5 of the same designers and powered by the same engine. In 1929, the Aviation Department of the Polish War Ministry ordered the prototypes and an airframe for static tests. The plane was initially known as PWS-11SM, for ''szkolno-myśliwski'' (fighter/trainer).〔Glass, A. (1977)〕
The first prototype of the PWS-11 was flown in November 1929 at Biała Podlaska by Franciszek Rutkowski. Its handling characteristics were lacking and as a result, its empennage underwent several modifications. The second prototype of 1930, designated the PWS-11bis was much improved. The rectangular section fuselage was replaced by an oval one and an engine was fitted with a Townend ring. After further changes to the empennage and Townend ring, the aircraft was then highly maneuverable and was found satisfactory. The Air Force however was not interested and the plane was not built in series.〔
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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