IS-2 Lower Plate change

On the mod. 1944 variant the lower plate suddendly is 130mm thick. When was that changed?
Very strange.


Effective armor 260mm at 60° impact angle = 130mm thickness

→ ???


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Update “La Royale” if I’m not mistaken. Gaijin completely overhauled the armor model of the IS-2 (1944)s, all the versions, and with it came the change to the LFP.

Edit: Yeah, I’ve confirmed it was “La Royale”. Pretty sure I was also literally the first person to even notice that change.

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Still killable to turret by everyone

AFAIK that is correct. The LFP of JS-2 Mod. 1944 with cast hull had nominal thickness of 120mm, actual thickness varied due to manufacturing deviations up to 130mm. That reddit post is wrong.

Glad to see soviets are getting buffed due to their primitive manufacturing techniques while other nations who employed stricter tolerance on their products are getting shafted because of it.


I remember when Pz IV and Pz V front plate was 85mm thick, because of tollerances. After a great cryout it was reverted… But this?

Who even shooting LFP of Is? Not a big deal.

LFP on the IS-2s is easily the biggest and easiest to hit weakspot, among the weakest two. That’s not the case now with IS-2 (1944)s and some people might still not know it.


Not turret face and really BIG cupola?

I dont care for the Is-2 as an enemy, but that one was changed back to Nominal, while the other was now “buffed” to max tollerance.

Even the “really BIG cupola” is a lot smaller than the LFP of the IS-1 and 2.

The turret front has a lot of additional extra plates that can screw up a shot with volumetric.

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I really almost never had problems with soviet volumetric. If i aimed, i got pen of turret cheeks.

It seems to be a generally accepted explanation that the thicker UFP on later Panther tanks is due to manufacturing tolerance, but I don’t believe this to be the case. +5mm is +6,25%, which is more than +5% max thickness tolerance used in German rolled armour manufacturing. No captured Tiger tank had 85mm thick sides. Also, we see this value again and again on captured vehicles, which is odd if we are to believe this to be a one off outlier.

Why was the glacis plate on later Panther tanks thickened? I don’t know for sure, but I have a theory. 80mm thickess is special as it sits right between 55-80mm interval of thickness and the 80-120mm interval with each having different specifications for (among other things) hardness.



Adding 5mm to the plate wouldve placed it into the “85-120mm” category meant to have lower hardness than preceeding interval. This would help improving the ballistic resistance against large caliber shell at large angle, but decrease resistance aganst small shell coming at low angle, but this would be unimportant as the Panthers UFP was mounted at 55° and would almost never encounter shells at lower obliquity.

So, if this was the only reason, then why didn’t they just manufacture softer 80mm plate just for this purpose? Well, idk. Which is why this is only a theory that needs more research to be viable explanation.


I’ve never seen any diagram showing an IS-2 lower plate at more than 100mm armor.



Btw, even on the Obr.1944, it remains a weak spot vs the 128mm PaK44, tested this in game earlier. Not sure about other guns at that BR.

Interesting. I wish they had measured the LFP thickness on more than one tank, just to be sure this is not a manufacturing flaw.

I only know that when soviets went from stepped to straight UFP they at least considered increasing the thickness of the LFP to 120mm and tested it: Tank Archives: Small Modernization of a Large Tank


Which would make sense as a relatively small increase in weight would’ve made the biggest weak spot to the german 7.5cm Pak 40 gun, disappear.

They are so desperately trying to morph this mediocre piece of junk into a King Tiger equivalent that it is not even funny. I guess this is where the stolen armor from the Maus turret front & Stug III A/F ended up at…


Ok long story short, is it better now or it is worse now??

We should always take these intelligence reports with a grain of salt, otherwise we have to conclude that driver’s plate on JS-2 is only 105mm thick and angled 16°.


Russian Wikipedia says that driver plate had several variations casted/rolled and with different thickness. Some researchers says about 6 different modifications.

IS-2 too but with different UFP.