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The KV-13 program's IS-85 prototype was accepted for production as the IS-1 (or IS-85, Object 237) heavy tank. After testing with both the 100 mm D-10 and 122 mm guns, the D-25T 122 mm gun 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 ...
The KV-85 was a KV-1S with the new turret from the Object 237 (IS-85) still in development, mounting the 85mm D-5T gun. The tank was a result of the USSR's tank design bureau being torn in two, one half focusing on the KV-85 and its variants, and the other working on the later IS series.
The KV-85 was a stop-gap solution until the introduction of the IS series. Note the modified KV chassis with the removal of the hull machine-gunner/ radio operator's station with one operated by the driver, and the driver's station slightly centered at the front; a staple design of all IS-series tanks.
The KV-1S was a version of the KV-1 with lighter armour (making it faster) and a new turret (still with a 76 mm gun). KV-85 was a KV-1S fitted with an 85 mm gun in the same turret as the IS-1. After Voroshilov lost political favour, the new KV-13 model with the KV-85's turret and gun was renamed IS-1 after Joseph Stalin. It was soon upgraded to ...
While most of the Soviet Union's armoured forces were composed of such tanks, the T-34 and the KV designs, which were previously unknown, took the Germans by surprise. [4] Both types were encountered on the second day of the invasion – 23 June 1941. [5] Half a dozen anti-tank guns fire shells at him [a T-34], which sound like a drumroll.
Russian Tanks, 1900–1970: The Complete Illustrated History of Soviet Armoured Theory and Design, Harrisburg Penn.: Stackpole Books. ISBN 0-8117-1493-4. Zaloga, Steven J., James Grandsen (1984). Soviet Tanks and Combat Vehicles of World War Two, London: Arms and Armour Press. ISBN 0-85368-606-8
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The IS Tank was a heavy tank series that replaced the KV-series during 1944 in World War II beginning with the IS-1(IS-85 or just IS) tank. The heavy tanks were designed with thick armor to counter German 88 mm guns and carried a main gun capable of defeating Tiger II , Tiger I , and Panther tanks .