The project was developed at Factory No. 92 in 1945. The design featured the Object 701 (IS-4) hull, but different transmission and suspension. The tank turret was developed from scratch. Existed only in blueprints.
Time for the successive autoreloading of each shell into the magazine.
Characteristics are specified for Siege mode.
The technical characteristics are displayed for the charged turbine mode.
Characteristics are specified for Rapid mode.
Reload time of the first and second guns on double-barreled vehicles.
Characteristics are specified for vehicles with crews trained to 100%.