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Concept
7.62 cm Pak 36(r)
Summary
The 7.62 cm FK 36(r) and Pak 36(r) (7.62 cm Feldkanone (Field gun)/36 (russisch) and Panzerabwehrkanone (Anti-tank gun) 36(russisch)) were German anti-tank guns used by the Wehrmacht in World War II. The first guns were conversions of the Soviet 76 mm divisional gun M1936 (F-22). Later in the war, the Soviet USV and ZiS-3 76 mm divisional guns were also converted.
The FK36(r) and Pak 36(r) both had a split-trail carriage with a transverse leaf spring axle suspension, and steel wheels, with foam rubber filled tires. The guns were equipped with a semi-automatic vertical breech block; the recoil mechanism consisted of a hydraulic recoil buffer and a hydropneumatic recuperator. There was no limber; therefore the gun could not be towed by a horse team.
Soon after the German invasion of the USSR in 1941, Wehrmacht units encountered new Soviet tanks: the medium T-34 and the heavy KV. The thick sloped armor of these vehicles gave them a good degree of protection against German anti-tank weapons. The situation eventually led to requests for more powerful guns that would be able to destroy them from long range. Germany already had a suitable design, the 7.5 cm Pak 40, entering production in late 1941, but the first pieces were not delivered until 1942. Until enough of these could be manufactured, expedient solutions were required.
In the early stages of Operation Barbarossa, the Germans captured a large number (approximately 1,300) of Soviet 76-mm divisional guns model 1936 (F-22). Developed with anti-tank abilities in mind, this Soviet gun had powerful ballistics; it was also originally intended to use a more powerful cartridge than the one eventually adopted. However, the design had some shortcomings in the anti-tank role: the shield was too high, the two man laying was inconvenient and the sighting system was more suitable for the F-22's original divisional field gun role. Using considerable thrift, German engineers were able to quickly modify the F-22, which by that time had been adopted in original form as the FK296(r) by the Wehrmacht.
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