I experimented with shooting the offline drone tanks last night, and had a couple of perplexing results on the Tiger I:
From the front, the most vulnerable part of the Tiger seems to be the main chassis. Even with the lowly panzer, if I landed a hit there, the Tiger would explode.
The turret was more durable than the main chassis. Hitting the turret from the front resulted in smoke rising from the target drone, but no insta-kill.
I would have thought it would be the other way around?
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Now, a tactical question. I noticed that shots landed diagonally on a tank are sometimes ineffective, i.e. the attacker sees the front and the side of the target; not a pure front shot, not a pure flank shot. This makes sense, as 90 degrees would be the optimum penetration angle for an AP shell, and 45 degrees or less would be ineffective.
Is it tactically sound to line your tank up diagonally to an enemy, so as to present them with an unfavorable chance of hitting your armor at 90 degrees?