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Don't know if it would've been ideal but it certainly would've been a whole lot better, esp. if other areas such as the radio communication equipment and so was improved as-well.
But one also has to think within the boundaries of possibility, and the gun was possible in the 100mm D-10, but the Soviets still lacked the know how and precision equipment to build proper optics, and their radio equipment wasn't particularly good either. Furthermore the 4 man crew was best increased to a 5 man one, and space inside the tank was best to be increased as-well to permit faster reloads, and that would nessicate a larger tank, probably in the 55 to 60 ton category. And by that point getting an engine powerful enough would've proven a challenge.
Hi,
Since the 3 crew members were located in turret, the possible 5th crew member would've to be seated next to the driver with almost no role in battle. The 100mm gun itself would've allow faster reloads, since it used unitary ammo.
The next major Russian tank type, the T-54/55, sported 100mm gun, armor up to 8in (yep, 203mm), almost the same engine, and weighted 20% less then IS-2. The Leo1 and AMX-30 have had 105mm installed, again weighting under 40 tons and being of modest size.
So I see no need to increase the tank.
.The 5th guy would be the radio operator and a hull machine gunner if such a thing was added, as in the German tanks.
T-34, KV-1, Sherman etc all featured the hull machine gunner.
This was the way forward. The hull machine gun was extremely effective when enemy infantry was in the area.
Rather a way backvard. The hull machine gunner position was all but removed from the 1st generation of post-WWII tanks, and no modern tank has it. Despite the massive proliferation of RPGs of all kinds.
As for the T-54, remember only the front turret had 204mm armour, the hull only had 99mm and the sides were pretty weak as-well. And again, a 4 man crew. And along with the T-72 the T-54/55 was when eventually tested by the British US considered a deathtrap, it was waay too cramped for one.
I've never said that T-54/55 were ideal tanks, but just offered the numbers for comparison.
I've also offered Leo1 and AMX-30 for the same purpose
And it's no wonder for someone used to the roomy M-47/48/60, or Centurion/Chieftain, to say that T-54 is cramped..
Boy ,don't i like to talk about tanks
The hull machine gunner has been removed from modern designs as tanks today are far more mobile and the angle of the hull rarely allows one to be installed, plus the turrets have much faster travers and the gun stays locked on target even if driving through the toughest types of terrain. All of this means that the hull machine gun isn't necessary on new tanks, but on a WW2 tank it was essential, and that the IS-2 lacked it just put it at a disadvantage.
Now while you say than the absence of a hull MG on the IS-2 improved the integrity of the glacis you'd be wrong. Why ?:
1.) Cause there simply wasn't room for a hull MG. Thus the absence of the hull MG wasn't a design choice in order to improve armour integrity, it was simply left out because there wasn't room for it. To sorta make up for that an MG was placed at the rear of the turret.