|Engine Power (hp)||620|
|Speed Limit (km/h)||40|
|Standard Shell Penetration (mm)||188 - 254|
|Standard Shell Damage||300 - 500|
|Rate of Fire (rounds/min)||4.5|
In 1956–1957, the Military Armored Forces Academy developed a speculative design for a new loading system on the IS-3 and T-10 heavy tanks. The IS-3 variant featured a double-row ammo rack with an automatic loading system. The crew was reduced to three members: commander, gunner, and driver. The turret was redesigned in order to accommodate the loading mechanism. The vehicle existed only in blueprints.