![]() It was intended as a stopgap vehicle, until the KV-4 and KV-5 were ready for production. The KV-3 was based on the previous KV-220, but with thicker 120 mm armor and the larger 107 mm ZiS-6 gun. On 7 April, the GABTU completely redesigned their request, introducing two new heavy tanks, the KV-3 (Object 223) and KV-5 (Object 225). ![]() The deadline for the blueprints was set for July 17, 1941. Propulsion was to be provided by a 1,200 hp M-40 engine, also developed at LKZ, and the crew was to consist of six. Armor was to be 130 mm at the front and 120 mm towards the sides and rear. The KV-4 was required to be a 70-72 tonne heavy tank armed with a 107 mm ZiS-6 gun, a secondary 45 mm 20-K gun, and at least three DT machine guns. Work on developing heavier tanks commenced, and on 21 March 1941, the GABTU sent requirements to LKZ for the development of the KV-4, designated Object 224. The Soviets realized that their existing heavy tanks, the T-35 and the KV-1, were not enough to match the German threat. The Soviet Union was caught off guard in 1941 when intelligence reports revealed that Germany was developing a 90-tonne heavy tank armed with a 105 mm gun. –Dear reader: A more detailed development analysis of the KV-4 program can be found in the KV-4 Dukhov article– KV-4 designs Placementġ07 mm ZiS-6 (F-42) main cannon (112 or 102 rounds) His unusual proposal was appreciated and was awarded sixth place in the competition. ![]() Its development consisted of a tank design competition, in which engineer K.I. But rumors of German super heavy tank projects catalyzed the development of a variety of even larger heavy tank projects, one of them being the KV-4. In spring of 1941, the Soviets were working on KV-1 replacements of various sizes and weights, from the moderate upgrade T-150, to the much larger KV-220. ![]()
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