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  1. In 1944 the Red Army began looking for a replacement for the battle proven T-34. Their initial action was to simply up-gun the T-34 again, this time with the 100mm D-10T from the SU-100. However deficiencies in the transmission prevented this plan from coming to fruition. As a result the Red Army turned to the T-44. Relying on experience gained from the T-44's own up-gun project they created what was called the T-44B. Given the major changes compared to the current T-44 they later changed the name to the T-54. Designed by A.A. Morozov between October 1944 and December 1944 it had reached sufficient development by November 1st 1944 that People's Commissar of Tank Industry of the USSR V.A. Malyshev ordered Factory №183 to produce a prototype. The factory built the original prototype by January 30th 1945 where until mid-February it underwent testing. On February 22nd it was sent to a NIBT training ground to undergo government testing. Despite identifying several flaws such as a lack hydraulic shock absorbers for the road wheels the T-54 was deemed superior to all existing domestic designs and recommended for eventual adoption. T-54 (first prototype) They had reason for their claim; with a transverse mounted engine and a torsion bar suspension the T-54 was much smaller than the T-34. This size decrease allowed the Soviets to significantly up-armor the tank without greatly increasing the weight. The front hull was 120mm thick angled at 60 degrees, the turret was 150mm thick. Despite the armor increases the T-54 only weighed 35.5 tons. Despite the wishes of of the Soviets (who wanted a 700hp engine on their T-34 replacement) the venerable V-2 sill powered the T-54. With an output of 520hp the T-54 was capable of 43.5 km/h. In addition to the increased armor the T-54 was armed with the 100mm D-10T-K gun which was capable of 7-4 rounds a minute. Like other Soviet tanks the turret design limited gun depression with only -3. So despite only being 35.5 tons the T-54 had comparable firepower and armor protection to the 45 ton IS-2. Armor of the T-54 (first prototype) In response to the deficiencies identified by the Red Army Factory №183 created another T-54 prototype. Still designated T-54, though by this point in time it would receive it's GABTU designation of Object 137. The tank was produced in July 1945 with government testing beginning in July and ending in November of that year. The T-54 second prototype had many changes, the hull and turret were redesigned, the transmission was replaced with a different one, the gun was replaced with the 100mm LB-1, among other changes. The new turret was up-armored to 200mm thick. In combination with the new gun and turret the T-54 second prototype had increased gun depression compared to the original with -5. All of these modification caused a weight spiral to 39.15 tons, which with the same V-2 engine as before the speed was reduced to 42.5 km/h. As before the Soviet Government recommended it for Red Army service along with the corrections of some defects. T-54 second prototype (Object 137)
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