On the L2A4, the front glacis plate has 600mm of Rolled Homogeneous Armor equivalent protection. The Leopard 2 uses composite armor, which is made up of steel plates, kevlar pads, ceramic plates, and open space, all designed to stop an incoming round. The Soviet 122mm m1931/37, the gun for the IS-2 and 3 tanks, using the same ammunition and at the same range, would penetrate ~125mm of armor. To pull some numbers, the German 8.8 cm KwK 36, firing APCBC (Armor Piercing round, filled with explosives, designed to penetrate armor) would, at 500meters, penetrate an average of 110mm of steel armor. Even the big guns of the war, like the 8.8cm or the Soviet 122mm would struggle against a modern tank round. Hence, "doorknocker".Īgainst a modern tank, the Pak36 would be completely useless. The round would make a loud BANG, alerting the tank crew to danger, and the flash would expose the guns position. So, the German 3.7cm Pak 36 AT gun was called the "doorknocker", because except at close range, and against the vulnerable side and rear of a tank, the gun simply wouldnt penetrate. Previous AMAs | Previous Roundtables Featuresįeature posts are posted weekly.
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