"Comparative table of tactical-technical characteristics of heavy IS-2 and IS-3 tanks
IS-2 | IS-3 | |
Combat weight (tons) | 45.5-46.0 | 46.0-46.5 |
Length, hull (mm) | 6770 | 6850 |
Full height (mm) | 2730 | 2450 |
Full width (mm) | 3070 | 3170 |
Clearance (mm) | 470 | 465 |
Bore axis (mm) | 1950 | 1800 |
Ground pressure on solid ground, kg/cm2 | 0.81 | 0.82 |
Armour protection, thickness and slope in mm/degrees | ||
Upper front plate | 90/60 | 120/55 |
Lower front plate | 90/30 | 110/55 |
Side, vertical | 90/0 | 90/0 |
Side, sloped | - | 90/60 |
Rear | 60/41-49 | 60/41-49 |
Turret front | 100/0 | 240/0 |
Sides | 100/20 | 115/45 |
Roof | 30 | 20-30 |
Floor | 20 | 16-20 |
Turret ring diameter | 1800 | 1840 |
Armament | ||
122 mm D-25 gun | 1 | 1 |
DT machinegun | 2 | 1 |
DShK AA machinegun | 1 | 1 |
Gun ammunition | 28 rounds | 28 rounds |
Engine | ||
Diesel | 1 | 1 |
Maximum power at 2000 RPM (hp) | 600 | 600 |
Normal power (hp) | 520 | 520 |
Range without refueling (km) | 120-150 | 140-150 |
Transmission and chassis | ||
Friction clutch | Multi-disk, dry | |
Gearbox | 8 gear | |
Turning mechanism | Planetary, two step with friction stopper | |
Brake | Floating band type | |
Final drives | Planetary gear | |
Suspension | Torsion bar | |
Road wheels per side | 6 | |
Aiming and observation devices | ||
Periscopic tank sight | T-Sh-14 | |
Collimating sight | KV-T | |
MK-IV observation devices | ||
Commander | 1 | 1 |
Driver | 2 | 1 |
Loader | 1 | 1 |
Gunner | - | 1 |
"