tanks vs rpg's

[PlasmaKrab]

That's right, penetration bonus can account for the numerous weak points crowding any AFV.

And yes, sometimes you see a round getting a huge bonus but still not penetrating... that can be quite infuriating.

RanXerox, JaM is right, you should look closely at the hit reports given when your tank is hit, that will tell you which part exactly as been hit and what the penetration and armor ratings used were (depends on the hit angle).