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PWS-8
The PWS-8 was a Polish sports plane of 1930, constructed by the ''Podlaska Wytwórnia Samolotów'' (PWS), that remained a prototype.
==Design and development==
The plane was designed in 1929 by Jarosław Naleszkiewicz in ''Podlaska Wytwórnia Samolotów'', on factory's initiative, to participate in the Challenge 1930 international touring aircraft contest (with PWS-50, PWS-51 and PWS-52). It was a wooden biplane, partly modelled after de Havilland Gipsy Moth.〔Glass, A. (1977), p.184-185〕 Its unique feature, taken from earlier PWS military aircraft, like PWS-5, were N-shaped struts between lower and upper wing and additional oblique transverse struts, stiffening the design, instead of wire braces (similar bracing to Handley Page Gugnunc〔(Edwin P.A. Heinze, ''International Touring Competition'' ), in Flight, August 8, 1930, p.888〕).
The plane was first flown in 1929/1930 by F. Rutkowski, with Armstrong Siddeley Genet 80 hp radial engine. In spring of 1930 it was modified, with Walter Vega 85 hp radial engine, also a tailfin shape and some other details were changed. It was however too heavy for engines used (65 kg heavier, than designed).〔
The plane was a counterpart of PZL.5 for a sportsplane and trainer, but was worse, and as a result, remained a prototype.〔 Its major fault was low speed, especially in a view of competition purpose.
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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