The intention with FHA was to provide a harder outer face, to defeat smaller projectiles, while the remainder of the plate provided more ductility to defeat larger rounds. The Germans used mostly RHA, with some of the key plates in the 30-50mm range being faced hardened (FHA) to a depth of about 5mm. Panzer IV is a more complex shape, totaling 45 plates. In addition, there are the turret vision slits as potential targets. The Soviets tended to use very high hardness steel, which is a good thing against lighter rounds, but lacks ductility and actually makes it more vulnerable against heavier rounds (such as the Panzer IV's 75mm). The mantlet and turret are cast steel, while the rest is RHA (rolled homogenous armor). T-34 consists of 21 plates, plus the driver hatch and gun mantlet. This means the game is tracking the actual flight-path downrange.
The game uses the same form of ballistics calculations for large projectiles as for small arms.
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