
S-51Designed and built on the chassis of the KV-1S. The development of a prototype started in January 1944. The 203-mm B-4 howitzer was mounted on the restored hull of a KV-1S. From March 1944 through to the beginning of April, the vehicle underwent trials. Despite successful trials, the S-51 never entered mass production.
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203 mm B-4 (S-51) (damage per shot: 900):
152 mm BR-2 (S-51) (damage per shot: 600):
500
701
885
1044


203 mm B-4 (S-51) (damage per shot: 900):
152 mm BR-2 (S-51) (damage per shot: 600):
Expected
frags:
0.91
Expected
spot
0.04
Expected
defense points
0.83
Expected
winrate
50.93%












Tier VII field modification
available for tier IX-X tanks
Tier VIII field modification
available for tier X tanks
-3% to dispersion during gun traverse
+3% to engine power
+4% to dispersion during movement
+5 km/h to top forward speed
-7% to concealment after firing
-5% to dispersion on gun traverse
+5% to dispersion on hull traverse