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SU-122 UZTM (1943)

Description

Assault gun SU-122 was produced at Ural Heavy Machinery Factory (UZTM) in Sverdlovsk from the end of December 1942 till August 1943 with 640 units built in total.

It used Т-34-76 tank chassis, but the crew compartment has been completely rebuilt and the original turret was replaced with 122 mm M-30S howitzer. The suspension, engine compartment and the total weight of the vehicle remained the same, although the front armor slope was reduced. The assault gun was equipped with panoramic non-recoiling gunsight capable of direct fire for the gunner and PTK-5 panoramic visor for the commander.

The assault guns made in early May 1943 like the one represented in the sim had a new traveling lock for the gun, different gunner cupola shutter mechanisms and a small hatch that made access to the right track tightener easier.

Unladen weight: 30900 kg.
Length: 6.9 m.
Width: 3.0 m.
Height: 2.2 m.
Clearance: 400 mm.

Engine: V-2 diesel.
Maximum power: 500 HP at 1800 RPM.
Maximum RPM: 1900 RPM.
5 speed gearbox.

Maximum road speed:
1-st gear: 7.4 kph.
2-nd: 15.9 kph.
3-rd: 22.4 kph.
4-th: 34.1 kph.
5-th: 54.0 kph.
Reverse: 8.4 kph.

Maximum offroad speed: 31 kph.

Fluids:
Internal fuel tanks capacity: 460 l.
Engine oil system capacity: 80 l.
Summer engine coolant: 95 l. of water
Winter engine coolant: 95 l. of 50% ethylene-glycol
Endurance range: 300 km.
Maximum oil consumption: 9 l/h.

Armour:
Front: 45 mm.
Sides: 45 mm rolled armour.
Rear: 45 mm rolled armour.
Roof: 20 mm rolled armour.
Bottom: 20 mm rolled armour.
Bottom above tracks: 20 mm rolled armour.
Gun mantlet: 45 mm rolled armour.

Main gun: rifled, 122 mm M-30S, separate loading.
Barrel length: 22.7.
Elevation: +25°..-3°.
Azimuth: +10°..-10°.
Ammo: up to 40 rounds.
Usable rate of fire: 3 rounds per minute.
Turret drive: mechanical.

Gun ammunition:

OF-462 high explosive (HE): 21.79 kg, 515 m/s, 3.67 kg explosives.
Gunsight settings
(Distance - point number of “ДГ полный” scale):
0000m - 000
0200m - 004 3200m - 064 6200m - 124
0400m - 008 3400m - 068 6400m - 128
0600m - 012 3600m - 072 6600m - 132
0800m - 016 3800m - 076 6800m - 136
1000m - 020 4000m - 080 7000m - 140

1200m - 024 4200m - 084 7200m - 144
1400m - 028 4400m - 088 7400m - 148
1600m - 032 4600m - 092 7600m - 152
1800m - 036 4800m - 096 7800m - 156
2000m - 040 5000m - 100 8000m - 160

2200m - 044 5200m - 104 8200m - 164
2400m - 048 5400m - 108 8400m - 168
2600m - 052 5600m - 112 8600m - 172
2800m - 056 5800m - 116 8800m - 176
3000m - 060 6000m - 120 9000m - 180

BP-460A high explosive anti-tank (HEAT): 13.34 kg, 335 m/s, 120 mm.
Gunsight settings
(Distance - point number of “ДГ третий” scale):
0000m - 000
0200m - 004 1200m - 026
0400m - 008 1400m - 032
0600m - 012 1600m - 037
0800m - 017 1800m - 042
1000m - 022 2000m - 047

Gunsights:
PG gunner panoramic periscopic sight, field of view 10.5°, allows indirect fire.
PTK commander panoramic periscopic sight, field of view 26°, for target designation and observation.

Radio equipment:
VHF 9-RM transceiver.
3 intercom terminals.

Modifications

High-Explosive Shells
OF-462

Good against soft, unarmoured or lightly armoured targets.

Mass 21.79 kg, explosives mass 3.67 kg.
Direct hit armour penetration 44 mm, effective damage distance for light vehicles 6 m.

When fired from a M-30S gun:
Muzzle velocity: 515 m/s.
500 m: velocity: 482 m/s, drop -5.1 m.
1000 m: velocity: 451 m/s, drop -20.5 m.
2000 m: velocity: 390 m/s, drop -91.1 m.

High Explosive Anti-Tank Shells
BP-460A

HEAT shells armed with high-explosive shaped charge warhead.

Their armour piercing capability doesn’t decrease with range, but accuracy does because of the lower projectile velocity and similar kinetic projectiles usually have a higher armour piercing capability up close.

Mass 13.34 kg, explosives mass 2.15 kg, armour penetration 120 mm.

When fired from a M-30S:
Muzzle velocity: 335 m/s.
500 m: velocity: 309 m/s, drop -11.7 m.
1000 m: velocity: 284 m/s, drop -49.6 m.
2000 m: velocity: 238 m/s, drop -224.6 m.

Removed Fuel Tanks
The external rear-mounted fuel tanks oftenly were removed.