In 1957, Uralvagonzavod built two Ob'yekt 140 prototypes which were put on trials soon after. The engine was placed on the bottom of the hull, a solution that reduced the height of the engine compartment. The tank carried 50 rounds and was powered by a V-36 diesel engine developed by engineer Artiemejev. The turret was cast and armed with the same D-54TS tank gun and included the Molniya two-plane stabilization system. The new tank had a suspension with six light road wheels made of aluminium. When the T-54M was abandoned, he and his design team started working on a new tank, called Ob'yekt 140.
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He had already led the development of the relatively minor upgrades to the T-54 that produced the T-54A (Ob'yekt 137G) and T-54B (Ob'yekt 137G2) and began the development of a more major update as the T-54M (Ob'yekt 139). Kartsev, the head of the OKB-520 design bureau of Uralvagonzavod factory (UVZ) in Nizhny Tagil.
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It was armed with the new 100 mm D-54TS tank gun.ĭuring this period, simpler upgrades to the existing T-54 design were assigned to a young engineer, Leonid N. The turret had three-layer armour with an overall thickness of 185 mm to 240 mm. Ob'yekt 430 had a hull of welded rolled steel plates and a turret of cast and forged steel. Object 140 Īfter delivery of the T-54 design, its lead designer Alexander Morozov turned his attention to a new design, the Ob'yekt 430. The T-62 thus took shape, marking an evolutionary improvement on the T-55. This in turn necessitated a larger hull, as the T-55 hull was simply too small to accept the new turret. The bigger gun required a bigger turret and turret ring to absorb the higher recoil. Įxperimental trials showed that the T-55 was inherently unsuited to mount the larger new cannon, and work, therefore, began on a new tank.
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It was decided to up-gun the T-55 with a 115 mm smoothbore cannon, able to fire kinetic energy penetrator armour-piercing fin-stabilized discarding sabot (APFSDS) rounds.
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While 100 mm high-explosive anti-tank (HEAT) ammunition could have done the job, they were much less accurate than APDS shells, and the relatively low flight velocity resulted in poorer accuracy if used on moving targets.