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SU-76-57

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"Mounting of a 57 mm mod. 1943 gun on a SU-76M SPG

This project is being designed according to an order from the Artillery Committee and consists of the installation of a 57 mm mod. 1943 ZIS-2 anti-tank gun barrel on the mount from the 76 mm mod. 1942 ZIS-3 gun on the SU-76M SPG chassis.

The ZIS-2 and ZIS-3 have identical semi-automatic systems and breeches.

The main characteristics of the prototype are shown in the table next to those of the SU-76M:

Characteristic

57 mm gun

76 mm gun

Muzzle velocity:

High explosive

Armour piercing

Subcaliber armour piercing


700

990

1270


680

662

950

Shell mass, kg

High explosive

Armour piercing

Subcaliber armour piercing


3.750

3.120

1.780


6.50

6.56

3.02

Rate of fire, RPM

12

10

Maximum gun elevation

17°

15°

Minimum gun depression

-4°

-3°

Horizontal range

+/-15°

+/-15°

Ammunition capacity

60

60

Crew

4

4

Full length of the SPG, mm

5625

5120

Penetration (calculated)

Armour piercing shell at 90°

100 m

300 m

500 m

1000 m

2000 m


Subcaliber armour piercing shell at 90°

100 m

300 m

500 m

1000 m

2000 m



115

110

106

96

77



175

160

140

120

95



79

76

73

65

48



128

110

92

77

58

Combat weight, tons

10.5

10.5


Trials of the experimental prototype were performed at the Gorohovets artillery proving grounds from May 1st to May 4th of this year in the amount of 270 shots, 107 of them with an increased charge.

After trials, a second variant of the 57 mm SPG was proposed to the Molotov factory, with the following changes:
  • Install the 10-T periscopic sight (remove the panoramic sight of the 76 mm mod. 1942 gun).
  • Install an electric trigger in the elevation flywheel handle. It is permitted to use mass production components to make the trigger.
  • Completely close the fighting compartment in order to protect the crew from bullets and shrapnel (6-8 mm thick roof, 15 mm rear plate).
Currently, GAZ is working on the second variant of the SPG."


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