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PZL.38 Wilk
The PZL.38 ''Wilk'' ("wolf") (PZL-38) was a Polish fighter-bomber developed and manufactured by PZL state factory in 1937.
==Design and development==
In 1934 the Polish Air Force ordered a new multi-role heavy fighter-bomber. It was initially supposed to replace fighters in both pursuit and escort duties and light bombers (at that time, such idea was popular in the world, what resulted in aircraft, like Bf 110). In an internal PZL competition a design of the engineer Franciszek Misztal won and was given the designation PZL.38 Wilk. In this construction was used diminished aerodynamic profile and configuration from medium bomber PZL.37 Łoś. The powerplant was to be 490-hp lightweight V-engine PZL Foka (''seal''), designed by Stanisław Nowkuński of Polish Skoda Works (then PZL WS-1). Unfortunately, Nowkuński died in Tatry mountains on 30 July 1936 and work on the engine slowed down. Due to technical problems, overheating and vibration, it was decided to use a foreign engine.
In 1937 two prototypes of PZL.38 were built. The second one (PZl.38/II) received the American Ranger SGV-770B engines (420-450 hp), which were less powerful than the PZL "Foka" engine. As a result the prototype didn't meet expected performance. The second prototype flew first in April or May 1936. The first prototype PZl.38/I, received the PZL Foka engine. The airplane was shown in 1938 at the Paris Air Show. It was flown only in February or March 1939 and also did not meet expected performance (estimated maximum speed was 520 km/h, while it hardly reached 465 km/h). It was also too heavy (2155 kg instead of 1715 kg) and had too small useful load. Because of these facts, further development of PZL.38 "Wilk" aircraft and "Foka" engine was abandoned in the Spring of 1939, in a favour of the new construction PZL.48 "Lampart" - which was a modification of "Wilk" with radial engines.
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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