tomas898989_2014, on 26 August 2015 - 06:02 PM, said:
Regarding the IS-4 roof, it's not a major weakspot at all (multiple times smaller and harder to hit than IS-3 and E5 cupola!!) and it still has the best turret in the game immune to all guns frontally (except for a milimetre weakspot)
You say? you think its normal that the IS-4 can get penned by IS-3? YES it is. because the IS-3 has to be above him and u can pen most tanks roof when you are above them, even IS-7 etc. When you are in the IS-3 you can't even pen the IS-4 in the roof because the IS-3 isn't tall enough.
On the other hand, the E5 can get penned in the lower plate easily by tier 8s(!!) and the cupola is also easily pennable. This means, in IS-4 or IS-7 you can fight a tier 8 without losing any health (if you are smart and can angle!) meanwhile in the E5 you will probably get shot two or three times... 
I'll make myself more clear: the thickness of IS-4 roof is 30 mm. The whole plate on the roof - 30 mm. Now, the 3 caliber rule: if you have a gun which caliber is 3 times bigger than a thickness of the armor - there will be NO ricochet. It doesn't matter where you are with that gun: above or below IS-4's roof - IF you hit the roof, your round will never bounce. Never ever.
You see, most people don't know about this rule, they see red, they don't shoot. But It doesn't matter if the roof of IS-4 is red or not visible, all you need is to hit it with appropriate gun.
So here is an example (positions are not exact, just for illustration):

Dead Rail map, was penning IS-4 with my M-103 with every shot with AP. All that was visible of him for me was his turret. He peek-a-booed from that building 3 times, 3 he times was shot and penned. He did not come for the 4th one unfortunately. I was obviously below that IS-4. That was no luck (you never lucky 3 times in a row).
Moreover, If an IS-4 is face-hugging you while you are with your E-100 or JgPz E-100, feel free to use HE on his roof, you'll inflict full HE damage possible.
On the contrary, the tit on E5's turret is very bouncy. You not only need to hit it, which is already a challenge, you need to pen it, which is even more challenging.
Edited by unkindest, 26 August 2015 - 08:06 PM.