The Object 268 is a SPG based on the T-10 chassis.
Virtually all Soviet tanks have this weak lower side armor that is 20-30mm depending on the vehicle.
However on the Object 268 the entire lower side, including the angled part conecting to the hull floor is 80mm.
This makes this area even more armored than the upper part of the chassis, which seems weird.
Seems like an oversight to me. Or is it?
Spoiler
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Is it possible that it was uparmoured? I find remarkably little looking online.
If it’s a genuine error it’s certainly grounds for a bug report, though I don’t think saying it’s based on the T-10 is enough…
@FlipAllTheTables this sounds like a thread for you.
I’d imagine it’s wrong since the Object 268 is supposed to be on the same hull as the T-10M, but I don’t do much research on Russian vehicles.
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Please explain what kind of circus with horses this is???
Why and how does a high-explosive projectile penetrate something that kinetic projectiles from heavy tanks cannot penetrate? Where is the real board of the self-propelled guns? Why is it on the IS-3 but not here?
Wrong. It is 80mm. Proof:
Crosssection “Ж” on the blueprint.
Half width indicated is 40mm, (Overlap with the Bottom plate needed in order to leave room for a Fillet Weld with Leg Lenght of 15mm.
I’m talking about this part here: The sloped lower side that connects to the bottom.
Which clearly does not have the same thickness as the straight side walls:

Also the upper side armor should be 80mm like the lower part, while in the game it’s only 60mm.
YES, my mistake. The cross section I gave is further back! Where the 80mm side armor protrudes all the way down (near the engine bay).
What you are talking about is the Bottom plate (at least I wouldnt call it “side” armor since its angle is closer to the horizontal than to the vertical).
So the cross section we need is “E”. Unfortunately no dimensions are given there but we can assume 30mm of thickness.
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“Also the upper side armor should be 80mm like the lower part, while in the game it’s only 60mm.”
You mean the one with the inward slope?
This?
Edit: you are right it should be 80mm. May be tomorrow I will make a bug report about all of this.
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I wonder if any of the Russian players that happen to live near the musuem would be able to go measure the armor?