Originally posted by JagdTankker
you mean the iS2.2 part ammo, 33 second load time for a 122mm gun.200mm of frontal armor plate.To bad it would never be modeled right in this game.
The D-25S and T was an A-19 with better designed breech block and a higher, but still slow, rate of fire (4 rounds per minute instead of 2 rounds per minute).
guns vs armorOriginally posted by Denniss
The IS-2 image is of a IS-2 model 1944 (or of a later, modified variant, the Is-2 m1944 were built from June 1944 on and had a maximum armor of 120 mm on the hull and 100mm on the turret.
Panther was able to pierce this IS-2 frontally at ranges of 1km and slightly above, Tiger 1 at ranges below 1km and KėPigstiger/Nashorn were able to achieve much longer ranged kills.
the same gun mounted on ISU122:
Having the same armament as the IS-2 it also had good armor performance but more importantly very good performance with high-explosive rounds. In order to kill a King Tiger frontally it had to be within 200m. A Panther however could be killed within 1500m. A-19S or D-25S cannon fired the 25 kg armour-piercing BR-471 projectile with a muzzle velocity of 800 m/s. It was able to penetrate the armour of all German World War II AFVs, with rare exceptions (only JagdTiger on its gun mantlet and superstructure, and Elefant were strong enough to resist the BR-471, although heavy spalling would be experienced, and the King Tiger could only be penetrated at 200m or less). But the BR-471 had high kinetic energy, and it often damaged heavily armoured German vehicles without armour penetration by mechanical shock, causing engine or gearbox failures. So the ISU-122 was very popular in the Red Army as a long-range tank destroyer. The 121.92-mm gun had great potential, but it should be noted that the gun's abilities were somewhat reduced by the available projectiles. In 1944 only the armour-piercing BR-471 was available (the Germans usually had these as well, but with ballistic nose and sub-caliber variants also). The improved version, BR-471B was developed in early 1945, but it was available in quantity only after World War II ended. So in difficult cases the ISU-122 fought against enemy heavy armour with high explosive projectiles OF-471. These shells also had a mass of 25 kg, muzzle velocity of 800 m/s, and were equipped with a 3 kg TNT charge. Mechanical shock and explosion was often enough to knock-out enemy AFV without any armour penetration.
wikipedia ISU122Originally posted by Rich46yo
I think most people would experience the terrible load times of the Stalin and never take it out again. It was actually an open country breakthrough tank which is a complete opposite to the way Tanks operate in AH. Not just that but the Stalin had a rather poor aiming system which negated much of the long range advantage the big gun gave it.
Had the JS been fitted with the far better 100mm gun, and had a better sighting system, this could have been a really great tank. As it was it was still the right tank at the right time, however, Im not sure it would fit into AH very well.
But I guess it all depends on modeling.
The 100mm gun (later adopted on the SU-100 tank destroyer and the T-55 tank) had superior armour penetration (185 mm compared to 160 mm), but a less useful high explosive round than the 122mm gun. Also, the 100mm gun was a relatively new weapon in short supply. Excess production capacity existed for the 122mm gun and its ammunition.
wikipedia IS-2 tank The first person to suggest arming the JS tank with a gun larger than 85 mm was the Director and Chief Designer of Factory #100, Zh.Y.Kotin. He realized in August 1943, after studying the results of the Kursk battle, that the most effective anti-tank weapon employed against German Tigers was the Corps 122 mm Field Cannon A-19 Model 1931.
The designers at Factory #9 came to the same conclusions as Mr. Kotin, and designed the D-2 Heavy Anti-Tank Cannon by marrying the A-19 barrel with the carriage of the Divisional 122 mm Howitzer M-30.
This powerful weapon was ordinarily employed against heavy tanks as an anti tank gun. The barrel of the gun was built into the gun carriage of the M-30 and the resulting gun successfully passed its tests, it became possible to install the A-19 gun in a heavy tank by using recoil-absorbers, elevation mechanism, and other mechanisms from the Experimental 122 mm Tank Howitzer U-11. This was done in a similar fashion to the 85mm guns D-5T and D-5S, but it was also necessary to add a muzzle brake.
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Nevertheless, the appearance of the turret was considerably changed in the process of its production. The first batch of tanks manufactured in 1943 had a narrow porthole through which the sighting telescope fits. After the installation of the D-25T Main Gun, it became almost impossible to use the telescopic sight, even though its breech was the same as that of the D-5T.
Starting in May of 1944, a new turret with a widened porthole was manufactured, which resulted in the sight being moved to the left. The armour protection of the tank's mantlet was improved and the armour thickness of the sides of the lower hull was increased.
The commander's cupola was shifted 63 mm to the left and the PT4-17 periscopic sight was changed to a MK-IV sight. A DShK anti-aircraft machine gun (designer P.P.Isakov) was installed on the commander's cupola. After that, no further significant changes were made to the turret until the end of the war.
Russian battlefield
