As shown at Kursk, the 122 and 152 mm (5.98 in) guns were better suited to take on on the new German tanks, the Tiger, Panther and Elefant. The choice of a new 122 mm (4.8 in) gun was studied by Kotin’s team at Zavod Nr.9. Though the IS-100 was reported to have better armor-piercing qualities, the latter had better all-around performance, and the IS-100 development was terminated. This resulted in the IS-100, two prototypes which went into trials against the IS-122 armed with the new A19 122 mm (4.8 in) gun. As early as November and December 1943, tests were performed with a new gun, the 100 mm (3.94 in) BS-3 already tested on the new SU-100 tank-hunter. However, the roomy turret could manage heavier and better guns. So the IS-1 had, like the former KV-1, only slightly better protection, but shorter range and poorer mobility compared to its medium counterpart. The only issue with this gun was that the new medium T-34/85, which sported the same gun, was released in the meantime, entering service during the winter 1943/44. The IS-1 was an improvement over previous designs, combining the hull developed for the KV-13 prototypes with the new three-man KV-85 turret, fielding the new D5-T 85 mm (3.35 in) gun. KV-13 prototype cutaway Precursors: The IS-1 and IS-100 If you spot anything out of place, please let us know! Hello dear reader! This article is in need of some care and attention and may contain errors or inaccuracies. These would prove real issues on the long run, starting with the gun itself, slow to reload and with bulky two-piece naval ammunition. In reality, some shortcuts were taken to meet the expectations. With a partly sloped frontal armor, 120 mm (4.72 in) thick and, moreover, a new massive 122 mm (4.8 in) main gun, the new heavy tank seemed to be just the trump card Stalin needed to wash over any armored opposition on the Eastern Front. Heavy Tank – 3,854 Built A new standard in hell: The IS-2Īs the escalation between German and Russian engineers reached a new point with the introduction on the German side of the Panther and Tiger, and the knowledge that something bigger was brewing, the IS-2 was pressed into introduction as soon as its main armament was ready.
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