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  1. 1. You would like to see this tank in WT?

    • Yes, in the regular line of research.
    • Yes, for premium
    • No (Please explain the reason)

Although it is only a prototype. And only have few units built.
I believe that would be a great addition to the game. Enclosed the ease that developers would have, because it use the same chassis as the IS-2 1943, and the same cannon of the Su-100.
objekt 248(IS100 s S-34) 



objekt 245(IS 100 s D-10)



objekt 245(IS 100 s D-10)



objekt 248(IS100 s S-34) 





edited image of IS+SU100 barrel








Birth of the IS Tanks Part 3: IS-100 and Beyond
Even after the vastly successful D-25T gun was chosen for the IS, experiments with the armament of the IS continued. Immediately after the failure of the 107 mm ZiS-6, Grabin's construction bureau hedged their bets on a 100 mm gun based on the naval B-34, similar to the S-3 field gun already being developed. The resulting tank gun was indexed S-34. It also had a mechanism to ease loading and increase the rate of fire. The D-5T-85BM, a higher power 85 mm gun, was also in the running, as well as another 100 mm gun, D-10T. Since the IS-85 and IS-122 were renamed to IS-1 and IS-2 by this point, these new prototypes were named IS-3* (Object 244, with a D-5T-85BM), IS-4* (Object 245, with a D-10T) and IS-5 (Object 248, with an S-34). The IS-3* was rejected due to insufficient muzzle velocity, and thus penetration, of its gun. Initially, out of the remaining designs, the IS-5 was going to win the title of IS-100 and begin production, but both ended up being built. The IS-4* and IS-5 can be distinguished by the position of the commander's cupola: the IS-5's gun required a gunner to the right of the gun, flipping the internals of the turret. The turret also would contain a loading mechanism and a gun stabilizer, but they were not present in initial trials. IS-5 was deemed superior, due to better ergonomics of the loader and gunner, but both designs had some problems that had to be resolved. The D-10T gun was more reliable, but made the loader's job more difficult, and only allowed to carry 30 shells. The S-34 threatened to smack the commander when it recoiled. It was recommended to move him even further right. In October of 1944, the IS-5 turret was finalized. With its loading mechanism and stabilizer, it was superior to every existing heavy tank in terms of rate of fire and accuracy on the move. However, in Malyshev's letter to Beria on October 18, 1944, he wrote: "...[122 mm guns] can now fight any German tank at a distance of 1700 meters and greater..."

The following points supporting the IS-100 were outlined in the letters between Malyshev, Beria, and Fedorenko:
  • Increased rate of fire (up to 8 rounds per minute)
  • Increased ammunition capacity
  • Lack of muzzle brake improves working conditions for the gunner
  • The tank is 500-600 kg lighter, which allows for additional armour
  • Smaller size, leading to a roomier turret
  • Higher penetration
  • Factory #9 was ready to produce D-10T guns along with D-10S
Points against the IS-100 in the same series of letters:
  • D-25T is already sufficient against German tanks at all combat ranges
  • Reduced caliber will reduce HE effectiveness against enemy fortifications and soldiers
  • The increased ammunition capacity is negligible (29 rounds instead of 28)
  • A large caliber, high rate of fire semi-automatic gun will lead to high concentrations of gases inside the tank

Additionally, in a report from the Chief of Experimental Machinery to the Chairman of the Technical Council, the superiority of the D-10T to the D-25T in armour piercing capacity is challenged:

"[The D-25T] penetrates a Panther frontally at 2500 meters, and that is not the limit. The 100 mm D-10T tank gun ... penetrates the front of the Panther at only 1500 meters, which is the maximum distance. ... The results are preliminary, as the D-10T has already fired 400 shells while the D-25T is new, but the difference is so drastic, that it is unlikely to change. "

The report explains this with the lower muzzle velocity of the D-25T: at such a large range, the heavy 25 kg shell has no problem penetrating the Panther's front, while its higher arc lets it impact the front of the Panther at a favourable angle. The D-10T's shells are faster, and therefore fly flatter.

The IS-5 was briefly a platform for very high velocity 85 mm ZiS-1PM (1000 m/s) and S-34-1B (1040 m/s), but those did not pass trials. From the same letter:

"Another question that is prompted by the experiments at Kubinka is the question of large muzzle velocities, namely of 85 mm guns with muzzle velocity of 1000-1100 m/s. Experience shows relatively poor effectiveness of the German 88 mm gun against the German Panther tank. At the same time, we know that such a gun would be of similar effectiveness to a 100 mm gun with muzzle velocity of 900 m/s. Work on these guns is conducted by TsAKB and factory #9, but their effectiveness against a real German tank is increasingly doubtful, especially considering that we cannot place this gun in a turret smaller than one that requires the D-10T or S-34 gun."

Moving on to the IS-6, its initial requirements were pretty lofty. Here are the project requirements:



CAMD RF 38-11355-2243
The mass was incredibly high compared to any IS tank before it, 65 tons. The armour was initially supposed to resist all German 75 and 88 mm guns, firing at up to 1500 m/s (I wonder where they managed to find those), but that requirement is struck out in the document. The tank was to be armed with a 122 mm gun, capable of 4-6 RPM, with one-piece ammunition. and 1100 m/s muzzle velocity. One 50 mm breech-loading mortar was planned (a feature experimented with on all IS tanks), but also crossed out. The tank would carry 35-40 shells for its main gun, 1500 rounds for its 7.62 mm coaxial machine gun, 500 rounds for its 12.7 mm AA machine gun, 1000 rounds for SMGs, 25 grenades, 27 signal flares, and 12 smoke bombs. All of this was planned to move at 40 kph, powered by a 1000 hp engine. 
The IS-6 didn't quite measure up to these requirements, but, several years later, the IS-7 did. 



Precursors: The IS-1 and IS-100

The IS-1 was an improvement over previous designs, combining the hull developed for the one of the KV-13 prototypes with the new three-man KV-85 turret, fielding the new D5-T 85 mm (3.35 in) gun. The only issue with this gun was that the new medium T-34/85, which sported the same gun, was released in the meantime, entering service during the winter 1943/44. So the IS-1 had, like the former KV-1, only slightly better protection but shorter range and poorer mobility compared to its medium counter-part. However the roomy turret could manage heavier and better guns. As early as November and December 1943 tests were performed with a new gun, the 100 mm (3.94 in) BS-3 already tested on the new SU-100 tank-hunter. This resulted in the IS-100, a single prototype which went into trials against the IS-122 armed with the new A19 122 mm (4.8 in) gun. Though the IS-100 was reported to have better armor-piercing qualities, the latter had better all-around performances, and the IS-100 development was terminated.


Edited by _PabloSniper_
  • Upvote 41
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ahh, now i see them, now i know what you are talking about. the is-1-100. the original planned frontline heavy tank of the soviet union. wasnt used because there wernt enough quantitees of the 100mm cannon, which later in the war was and was then put in the su-85 and upgraded to the su-100. instead, they used the 122mm cannon, which performed close enough to the 100mm, and its HE shells were known to blow off turrets of panzer 4's and panthers.


i would like this, but i think they will add it as a premium tank. a 100mm variant of the is-2 would also have a bigger matchmaking, since the 100mm reloads faster and has in comparisment better characteristics. maybe at 6.7 like the su-100.

Edited by sollitdude

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I understood now


So object 245 (D-10T) or object 248 (S-34)


It seems that object 248 was better, had a redesigned turret with gunner to the right, better room for loader, loading mechanism 8 rounds per minute, stabilizer. Now I don't know anything about the gun, but according to the article it had a longer recoil than D-10T, also what about its capabilities?

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I vote for this to not be premium. That's my policy for vehicles which were abandoned for some reason or another. But, ultimately, Gaijin will decide.


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actually, if i were to believe the wiki page.




and i quote: "Two candidate weapons were the A-19 122 mm gun and the BS-3 100 mm gun. The BS-3 had superior armour penetration (185 mm compared to 160 mm), but a less useful high explosive round. Also, the BS-3 was a relatively new weapon in short supply, while there was excess production capacity for the A-19 and its ammunition. Compared to the older F-34 76.2 mm tank gun, the A-19 delivered 5.37 times the muzzle energy and had similar accuracy to that of the 88 mm gun mounted on the Tiger Ausf B.[12]

After testing both A-19 and BS-3 guns, the former was selected as the main armament of the new tank, primarily because of its ready availability and the effect of its large high-explosive shell when attacking German fortifications. The A-19 used a separate shell and powder charge, resulting in a lower rate of fire and reduced ammunition capacity, both serious disadvantages in tank-to-tank engagements. The gun was very powerful, and while its 122 mm armour-piercing shell had a lower muzzle velocity than similar late-issue German 75 mm L/70 and 88 mm L/71 guns, Soviet proving-ground tests established that the D-25 could penetrate the front armour of the German Panther tank at 2500 m while the D-10 could do so at its maximum range of 1500 m.[13][14] It was therefore considered adequate in the anti-tank role." end quote.


so there was plans, and field testing of the 100mm gun. it would be strange if it wouldnt be in the game.

Edited by sollitdude

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Looks like a pretty good candidate for a branch off the IS-2 and probably would be well suited for same BR as the IS-2 44, that way you have the 44 is-2 with better armour and bigger gun or a better AT gun with higher ROF and AP power but less armour to choose from. However i don't fancy more high tier premiums, with the huge grind it would prove to be too much of a advantage.

Edited by Cariocecus
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looks like an acceptable variant. shame about it not being built much, but it would not be the only rare machine about.


as it has the benefit of a turret, it may be appropriate to consider placing it slightly higher br than su-100

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