Re: Pen1 Arm4 @ 18 degrees
To further the point made by SaS TrooP, penetration of sloped armor depends greatly on the angle at which the projectile "attacks". as you can see here:
When hit head on at a 90 degrees angle the T-55 has a mere 100mm of frontal armor, however its sloped armor can create a situation where it provides 200mm of protection. This is true not only of sloped armor but all armor, if rounds hit at strange angles they are deflected or must pass multiplied thickness of steel. This means that in combat both KE(kinetic energy) and CE(Chemical Energy)penetration differs greatly the figures given by manufacturers. What effects this, and is modeled quite well in SPMBT is the range, slope and shape of armor, height difference between shooter and target, and characteristics of the projectile.
The same AT-3 Sagger can be completely stopped by the frontal armor of a tank if it hits at a flat angle, or utterly penetrate and destroy the tank if it hits at a straight angle as it was designed to do.
So when you see "PenX Arm Y @ Z Degrees" you are actualyl given an explanation by WINSPMBT as to why a specific target was penetrated/not penetrated/partially penetrated.
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The best terrain for tank operations is terrain devoid of anti tank weapons.
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