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PWS-5
The PWS 5 or PWS 5t2, was a Polish liaison aircraft, developed in 1928 by PWS (''Podlaska Wytwórnia Samolotów'' - "Podlasie Aircraft Factory").
==Design and development==
In 1927, the Aviation Department of the Polish War Ministry opened a contest for a liaison and observation plane capable of operating from unprepared airfields, in cooperation with land Army units. In the PWS factory, Aleksander Grzędzielewski and Augustyn Bobek-Zdaniewski proposed a plane, designated initially P.W.S. 7, the first prototype of which was flown on 28 December 1928 at Biała Podlaska by Franciszek Rutkowski, with the designation changing to P.W.S. 5 in 1929.〔Glass, A. (1977)〕
An interesting feature was the interchangeable upper and mainplanes which resulted in the upper wings being shorter than the lower, due to the lack of a centre-section between the upper planes. In February 1929 a second improved prototype,with a shorter forward fuselage and larger tail surfaces,〔 designated P.W.S. 5a was flown, which, in spite of being heavier than planned, empty weight 735 kg (1,620 lb) versus 600 kg (1,323 lb), that affected performance, the War Ministry considered the design satisfactory, with good handling and stability, ordering a short series of 5 aircraft which were designated PWS.5t2 by the factory in a similar fashion to the French Air Ministry ("t" standing for ''towarzyszący'' - army co-operation and 2 being the crew size).〔
However, a detailed evaluation in the Aviation Technical Research Institute (ITBL) showed, that the 'PWS.5t2' had a long take-off run, poor handling in the glide at slow speed and low ceiling due to the use of an inadequate Wright propeller.〔 Other competitors: the PZL Ł.2 and Lublin R-X were evaluated, with better results, so no more PWS-5s were ordered.〔
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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