DOSSIER · UNCLASSIFIED · OPERATIONS2026-08-28 · OPS-WX

SECTION 10 // ARMOR / VEHICLE PROFILEREF · S-51

VII

S-51

USSR·

SPG·SPG

Designed 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.

Configuration

Health

350

DPM

1,033

View range

275m

Speed

30km/h

Camo

9Terrible

Mark of Excellence requirementsCombined dmg + assist · NA · 2026-08-27

3 marks of excellence

3 marks · 95%

2,042

2 marks of excellence

2 marks · 85%

1,653

1 mark of excellence

1 mark · 65%

1,157

A-01 · ARMOR SCHEMA

Armor thicknessMeasured

Nominal plate thickness straight from the game client. Click any plate to highlight it on the 3D model and focus the camera on it.

Armor

7mm

75mm

Hull

All 10 plates

Turret

All 1 plates

A-02 · SPECIFICATIONS

Specifications

Builds

Grade

Experimental

CrewShared perks

Field mods

Lv 0/5

Weaponry

DPM: 1,033
Damage: 900
Penetration: 52 mm
… at 500m: 52 mm
Reload time: 52.30 s
Rate of fire: 1.15/min
Aim time: 6.30 s
Dispersion: 0.830 m
… moving: 0.280
… tank traverse: 0.280
… turret traverse: 0.550
… after firing: 7.0
Damage vs. modules: 135
Caliber: 203.0 mm
Shell velocity: 425 m/s
Max range: 10,000 m
Ammo capacity: 12
Potential damage: 10,800
Shell cost: 1,910 cr

Mobility

Top speed: 30 km/h
Reverse speed: 8 km/h
Power/weight: 12.07 hp/t
Tank traverse: 20.0 °/s
Turret traverse: 12.0 °/s
Effective top speed
… hard: 30.0 km/h
… medium: 30.0 km/h
… soft: 19.3 km/h
Effective traverse
… hard: 20.0 °/s
… medium: 17.3 °/s
… soft: 10.4 °/s
Gun elevation: 58 °
Gun depression: 2 °
Gun traverse range: -4° / 4°
Terrain resistance
… hard: 1.30
… medium: 1.50
… soft: 2.50

Everything Else

Hull armor: 60 / 60 / 60
Health: 350
Engine health: 190
… repaired: 95
Track health: 120
… repaired: 90
… repair time: 7.20 s
Ammo rack health: 190
… repaired: 143
Fuel tank health: 150
… repaired: 60
Total weight: 49,710 kg
Stationary camo: 4.10 / 0.51%
Moving camo: 2.05 / 0.25%
View range: 275 m
Fire chance: 15%
Tank cost: 1,400,000 cr

Gun Constraints

-4° / 4° traverse

Crew

CommanderRadio Operator
Gunner
Gunner
Driver
Loader
Loader

A-03 · MODULE RESEARCH

Module research

Guns

VI

Stock

152 mm BR-2 (S-51)

VII

64,000

203 mm B-4 (S-51)

Radios

IX

Stock

12RT

Engines

VI

Stock

V-2K (S-51)

VII

11,200

V-16

Tracks

VI

Stock

S-51

VII

7,965

S-51 Bis

A-04 · SERVER PERFORMANCE

Server performance

Aggregate stats from NA players over the last 30d

Avg WN8

807

Average

Avg WNX

808

average

Win rate

49.1%

Below Average

DPG

755

Frags

0.57

Spots

0.02

Survival

40.8%

Dmg taken

213

Hit rate

26.5%

Spot assist

12

Track assist

20

Defense

0.36

Avg XP

542

Aggregated from 882 tracked NA players · 6,736 battles. Coverage grows as more players are tracked.

MoE thresholds (combined dmg + assist)

65%1,157

85%1,653

95%2,042

Reach these combined damage (dealt + assist) values over a rolling window to earn marks of excellence.

Performance over time

Daily NA 30-day aggregates — how this tank trends as patches and meta shift

Population spread

How NA players actually perform in this tank (30-day window)

A-05 · TOP OPERATORS

Top players

Highest performers in the S-51 on NA

A-06 · VIDEO INTEL

Video reviews

Curated reviews, replays, and guides from veteran players

A-07 · SIMILAR HULLS

Similar tanks

Closest matches by stat profile — pick the ones that fit your playstyle.

A-08 · CHANGELOG

Balance changelog

What changed for this tank between game versions

2.0Sep 1, 2025
- Mobility on hard terrain——
- Mobility on medium terrain——
- Mobility on soft terrain——
- EngineV-2KV-2K (S-51)
- EngineV-2-10removed
- GunS-51 / 152 mm BR-2S-51 / 152 mm BR-2 (S-51)
- GunS-51 / 203 mm B-4S-51 / 203 mm B-4 (S-51)

The full USSR tech tree