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S-51

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S-51

AnnoR15_S-51.png
Battle Tier
1234567891011
Overview
Mouse over "
Well, the ones further down, of course.
" for more information
[Client Values; Actual values in
Specifically, the mismatch in crew values caused by commander's 10% crew skill bonus. Outside of a crew of 1 commander only, 100% crew is a fiction. The client values, given for 100% crew, will normally be taken into battle with 110% crew skill members aside from specific functions, causing their actual performance to deviate from the expected client value. These differences are taken into account in tooltip boxes.
]
1,400,000  Credits Cost
350350 HP Hit Points
50.22/5249.71/52.5 t Weight Limit
Crew
  1. Commander (Radio Operator)
  2. Gunner
  3. Gunner
  4. Driver
  5. Loader
  6. Loader
Mobility
500600 hp Engine Power
30/8 km/h Speed Limit
1820 deg/s Traverse
9.9612.07 hp/t Power/Wt Ratio
YesYes Pivot
Armor
60/60/60 mm Hull Armor
Armament







{{#ifeq:HIGH_EXPLOSIVE|ARMOR_PIERCING||



{{#ifeq:|ARMOR_PIERCING||


HE/HE







{{#ifeq:HIGH_EXPLOSIVE|ARMOR_PIERCING||



{{#ifeq:|ARMOR_PIERCING||


HE/HE
Shells




















1120/5200




















1910/8000
Shell Cost
700/700/1050/1050/ HP Damage
38/38/52/52/ mm Penetration



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2.4 r/m 

Standard Gun

Reload Times
Nominal: 25 s
50% Crew: 30.97 s
75% Crew: 27.04 s
100% Crew: 23.97 s
Rammer: 21.57 s
Vents: 23.44 s
Both: 21.1 s
Both and BiA: 20.64 s
Both and Max Crew %: 19.78 s

See Crew, Consumables, or Equipment for more information.



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1.15 r/m 

Standard Gun

Reload Times
Nominal: 52.3 s
50% Crew: 64.79 s
75% Crew: 56.57 s
100% Crew: 50.15 s
Rammer: 45.14 s
Vents: 49.04 s
Both: 44.14 s
Both and BiA: 43.18 s
Both and Max Crew %: 41.39 s

See Crew, Consumables, or Equipment for more information.
Rate of Fire






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1841

Standard Gun

Using Shell Type 1 (700 Damage):
With wholly penetrating hits

Theoretical Damage Per Minute
Nominal DPM: 1841
50% Crew: 1484
75% Crew: 1701
100% Crew: 1918
100% Crew
Vents: 1960
Rammer: 2128
Both: 2177
Both and BiA: 2226
Both and Max Crew %: 2324

Advantageous Damage Per Minute
First-shot DPM: 2541
50% Crew: 2184
75% Crew: 2401
100% Crew: 2618
100% Crew
Rammer: 2828
Vents: 2660
Both: 2877
Both and BiA: 2926
Both and Max Crew %: 3024

See here, here, or here for more information.

Standard Gun

Using Shell Type 2 (700 Damage):
With wholly penetrating hits

Theoretical Damage Per Minute
Nominal DPM: 1841
50% Crew: 1484
75% Crew: 1701
100% Crew: 1918
100% Crew
Vents: 1960
Rammer: 2128
Both: 2177
Both and BiA: 2226
Both and Max Crew %: 2324

Advantageous Damage Per Minute
First-shot DPM: 2541
50% Crew: 2184
75% Crew: 2401
100% Crew: 2618
100% Crew
Rammer: 2828
Vents: 2660
Both: 2877
Both and BiA: 2926
Both and Max Crew %: 3024

See here, here, or here for more information.






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1207.5

Standard Gun

Using Shell Type 1 (1050 Damage):
With wholly penetrating hits

Theoretical Damage Per Minute
Nominal DPM: 1207.5
50% Crew: 976.5
75% Crew: 1113
100% Crew: 1260
100% Crew
Vents: 1291.5
Rammer: 1396.5
Both: 1428
Both and BiA: 1459.5
Both and Max Crew %: 1522.5

Advantageous Damage Per Minute
First-shot DPM: 2257.5
50% Crew: 2026.5
75% Crew: 2163
100% Crew: 2310
100% Crew
Rammer: 2446.5
Vents: 2341.5
Both: 2478
Both and BiA: 2509.5
Both and Max Crew %: 2572.5

See here, here, or here for more information.

Standard Gun

Using Shell Type 2 (1050 Damage):
With wholly penetrating hits

Theoretical Damage Per Minute
Nominal DPM: 1207.5
50% Crew: 976.5
75% Crew: 1113
100% Crew: 1260
100% Crew
Vents: 1291.5
Rammer: 1396.5
Both: 1428
Both and BiA: 1459.5
Both and Max Crew %: 1522.5

Advantageous Damage Per Minute
First-shot DPM: 2257.5
50% Crew: 2026.5
75% Crew: 2163
100% Crew: 2310
100% Crew
Rammer: 2446.5
Vents: 2341.5
Both: 2478
Both and BiA: 2509.5
Both and Max Crew %: 2572.5

See here, here, or here for more information.
Damage Per Minute


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0.69 m 

With 50% Crew: 0.855 m
With 75% Crew: 0.746 m
With 100% Crew: 0.662 m
With BiA: 0.647 m
With BiA and Vents: 0.633 m
Maximum possible: 0.607 m

For more details, see Crew


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0.83 m 

With 50% Crew: 1.028 m
With 75% Crew: 0.898 m
With 100% Crew: 0.796 m
With BiA: 0.778 m
With BiA and Vents: 0.761 m
Maximum possible: 0.73 m

For more details, see Crew
Accuracy


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5.4 s 

With 50% Crew: 6.689 s
With 75% Crew: 5.841 s
With 100% Crew: 5.178 s
With GLD: 4.707 s
With BiA: 5.064 s
With BiA and Vents: 4.954 s
With both and GLD: 4.503 s
Maximum possible: 4.317 s

For more details, see Crew or Equipment


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6.3 s 

With 50% Crew: 7.804 s
With 75% Crew: 6.814 s
With 100% Crew: 6.041 s
With GLD: 5.492 s
With BiA: 5.908 s
With BiA and Vents: 5.779 s
With both and GLD: 5.254 s
Maximum possible: 5.036 s

For more details, see Crew or Equipment
Aim time
1212 deg/s Gun Traverse Speed
8° Gun Arc
-2°/+58°-2°/+58° Elevation Arc
3012 rounds Ammo Capacity
General
1515 % Chance of Fire






275 m 

With 50% Crew: 216.1 m
With 75% Crew: 245.6 m
With 100% Crew: 275 m
With Recon and Situational Awareness: 288.9 m
With Coated Optics: 302.5 m
With Binocular Telescope: 343.75 m
Maximum possible: 393.7 m

For more details, see Skills or Equipment






275 m 

With 50% Crew: 216.1 m
With 75% Crew: 245.6 m
With 100% Crew: 275 m
With Recon and Situational Awareness: 288.9 m
With Coated Optics: 302.5 m
With Binocular Telescope: 343.75 m
Maximum possible: 393.7 m

For more details, see Skills or Equipment
View Range


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360 m 

With 50% Crew: 282.8 m
With 75% Crew: 321.5 m
With 100% Crew: 360 m
With 100% Signal Boost: 432 m
When affected by 100% Relaying: 396 m
Maximum possible: 518 m

For more details, see Skills or Equipment


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625 m 

With 50% Crew: 491.1 m
With 75% Crew: 558.1 m
With 100% Crew: 625 m
With 100% Signal Boost: 750 m
When affected by 100% Relaying: 687.5 m
Maximum possible: 899.3 m

For more details, see Skills or Equipment
Signal Range
Values are Stock - click for Top


VII

annoS-51.png

1400000

The S-51 is a Soviet tier 7 self-propelled gun.

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.

Often nicknamed by the players as "The Unicorn" for the impressive long barrel gun it holds when aiming upwards, out of the box, it has the SU-14-1's upgraded gun. It's rather slow when you first get it, and performance will be sluggish, but once upgraded, its mobility kicks in. Most players agree that the S-51 is superior to the SU-14-1 for these reasons: its mobility (especially when relocating to avoid becoming a counter-battery target), its agility in running from danger, and faster traverse speeds in switching between targets. It also has a smaller profile than the SU-14, which helps it with camouflage.

S-51 starts with 152 mm BR-2 Howitzer, which considering its repositioning in 8.6, makes it comparable to the old SU-8. However, the second gun, the 203 mm B-4 is the cannon that your enemies will fear you for. It gives the S-51 the ability to deal more alpha damage than any other Tier 7 SPG, and even deal one-shots to Tier 8 heavy tanks. On the downside, it has a very slow reload time and it is rather inaccurate. Its large splash radius will nonetheless ensure that your opponent receives at least some kind of damage. The 203 mm B-4 canon can only carry 12 shells, which in most cases is enough thanks to the low rate of fire.

The S-51 leads to the SU-14-2.

Modules / Available Equipment and Consumables

Modules

Ico_gun_alpha.png

Guns

Tier Gun Penetration
(mm)
Damage
(HP)
Rate of fire
(rounds/minute)
Dispersion
(m/100m)
Aiming time
(s)
Weight
(kg)
Price
(Credits)

VII 152 mm BR-2 38/38 700/700 2.4 0.69 5.4 5720 92000
IX 203 mm B-4 52/52 1050/1050 1.15 0.83 6.3 5200 235000

Ico_engine_alpha.png

Engines

Tier Engine Engine Power
(hp)
Chance of Fire on Impact
(%)
Weight
(kg)
Price
(Credits)

VI V-2K 500 15 750 23050
VI V-2-10 520 15 750 29000
VII V-16 600 15 750 36500

Ico_suspension_alpha.png

Suspensions

Tier Suspension Load Limit
(т)
Traverse Speed
(гр/сек)
Rmin Weight
(kg)
Price
(Credits)

VI S-51 52 18 0 12500 14600
VII S-51 Bis 52.5 20 0 12500 19800

Ico_radio_alpha.png

Radios

Tier Radio Signal Range
(м)
Weight
(kg)
Price
(Credits)

V 10R 360 100 3660
IX 12RT 625 110 33600


Compatible Equipment

Heavy Spall Liner Camouflage Net Fill Tanks with CO2 Coated Optics Enhanced Gun Laying Drive Enhanced Torsion Bars 5+ t Class Cyclone Filter Large-Caliber Artillery-Shell Rammer Binocular Telescope Toolbox "Wet" Ammo Rack Class 2 

Compatible Consumables

Automatic Fire Extinguisher Manual Fire Extinguisher Large First Aid Kit Large Repair Kit Lend-Lease Oil Extra Combat Rations Removed Speed Governor Small First Aid Kit Small Repair Kit 


Player Opinion

Pros and Cons

Pros:


  • 203mm gun has high vertical shell arc
  • Highest damage in tier (tied with the SU-14-1)
  • Better gun depression than it's brother, the SU-14-1. It has 1 compared to 0 degrees.


Cons:


  • Very narrow gun traverse
  • Very long reload time
  • Very limited ammo capacity
  • Slow aim time and low accuracy


Performance

Along with its counterpart the SU-14-1, the S-51 carries a massive-for-its-tier 203mm gun, but it pays dearly for that power. Similar to the G.W. Tiger (p) and SU-14-1, it has high damage for its tier (and is often overkill against tanks below its tier), but at the cost of low accuracy, long reload, and low mobility, and some may choose to use the 152mm stock gun for its better reload, higher accuracy, and damage that isn't overkill versus tier 5's. Its low ammo count of only 12 rounds with the top gun mean you can't carry much variety of ammo or you risk running out of a type. The bad accuracy combined with a long aim time means that you must pre-aim targets well in advance and choose your shots carefully, as you won't get many of them.


Early Research

  • Since it can hold the best gun, radio and engine in stock form, you don't have to get the Suspension.
  • IF you want the 203 mm gun on this vehicle, you can research it right away.
  • Get the radio as it extends the radio range
  • Next, get the suspension; it gives you better turning speed and maneuverability and it's relatively cheap to research
  • Finally, get the Engine
  • Even if you don't wish to use the 203 mm gun, you should still research it. You will need it on the SU-14-2.


Suggested Equipment


Large-Caliber Artillery-Shell Rammer Camouflage Net Enhanced Gun Laying Drive 


Gallery

Historical Info

On end of 1943, the GAU began the re-designing of mobile heavy duty self-propelled artillery systems. Ten years earlier, it was supposed to arm a platform with the 203-mm howitzer model 1931, with production planned to resume at the factory "Bolshevik" in 1944. If it succeeded, WPRA would get a mobile devastating weapon. By order of the Commissar of weapons Ustinov in November 1943, a competition to develop self-propelled guns was announced, which received the semi-official title of "Knight".

Within weeks, some preliminary drafts were presented from plant № 100 NKTP, CB Uralmash, and TsAKB. The first of them, created under the leadership of J. J. Kotin, was a self-propelled gun carriage with trailer that, in some ways, resembled the French GPF 194, but with a more powerful gun. Draft CB UZTM had two options; a 203-mm howitzer B-4 on the chassis of the KV-1S (modernized draft SAC U-19) or two 152-mm howitzers on two SU-122 chassis. Before using its gun, it was supposed to connect both chassis; preparation to firing was about 30-40 minutes, versus 20 minutes with the Kotin design. It is clear that the development of plant number 100 and UZTM won't give adequate fire support due to its technological complexity. In order to build a single prototype, only TsAKB submitted a draft SAU under the symbol "S-51". The chassis of the KV-1S was considered for the base of the S-51, but it was quickly discovered that the length of the support-surface was insufficient and needed adjustment: a modified version with 7 or 8 rollers. However, NKTP was reluctant to change its production because the amount of modifications required was relatively large, and the number of issued ACS was unlikely to be exceed several tens of units. To this end, it was decided to establish a howitzer on the chassis of an unaltered KV-1S anyways, which was not the best solution. The chassis did not undergo any major change, except for the engine. The tank turret was dismantled, and a 203-mm howitzer B-4 was mounted on the open gun-carriage. Because the weight of the 203 mm howitzer was slightly heavier than the weight of a fully-loaded turret, the full combat-load weight was almost 50 tons. Thus, it was not expected to have good mobility.

The first prototype of the S-51 entered factory tests in February 1944, conducted under the reduced program. However, interest in high powered artillery was so great that it was still not finished was transferred to ANIOP. Here, all of the major disadvantages of the S-51 were revealed. Because of the high line-of-fire when firing, the self-propelled chassis was strongly swayed by inertia and would move to a lateral displacement. The elevation angle was relatively small, and the recoil was so strong that the crew could not hold on their seats. The severe recoil, large size and weight of its projectiles, and the extreme discomfort for the crew would require the installation of a rammer/loader. In addition, the chassis of the KV-1S proved it was clearly not a good platform on which to install guns of this calibre. After comparing all the data obtained in the COD, it was felt that the S-51 still be sent to production, but to no success. First of all, the issue of using KV-1S chassis was resolved in December 1942: the required amount of modifications for heavy self-propelled guns was only possible with the serious alteration of serial machines. Another important reason was the lack of the B-4 howitzer, which was not in production-scale numbers.

In return, engineers and design bureaus TsAKB plant number 100 had developed a version of an SPG on the chassis of a heavy tank, with the installation of a 152-mm howitzer BL-2. A prototype self-propelled guns, named S-59, was made in early 1944 on May-June, and underwent range tests. There is some discrepancy in the data on the type of equipment. According to factory records, S-59 received the chassis and body from the IP-85, but according to a report on the tests, the self-propelled gun had the "improved chassis of the heavy KV tank ". However, when firing a full charge, the S-59 began to have problems similar to that of the S-51, so mass production of the unit was not raised. As a result, this direction in the development of ACS fire-power ended.

Nevertheless, the projects of heavy self-propelled guns continued to appear until the end of the war. For example, on July 29 1944, head of the Leningrad branch TsAKB Igor Ivanov presented the "technical adjustment of the IEC preliminary draft of ACS", which was supposed to use the chassis of paired T-34 tanks and the 210 mm gun BR-17 or 208 mm howitzer BL-18 . Based on a draft presented a year earlier of the proposed CB UZTM, this ACS differed by a more simple design. This development by TsAKB aroused some interest in the leadership of the People's Commissariat of Arms, but the timing of the project was not realistic; a prototype self-propelled gun was required to be submitted not later than 30 September of that year, and thus failed at the challenge of Leningrad.


Historical Gallery

USSR
Light Tanks IMS-1 IIBT-2 IIT-45 IIT-26 IIT-60 IITetrarch IIIBT-7 IIIBT-SV IIILTP IIIM3 Light IIIBT-7 artillery IIIT-127 IIIT-46 IIIT-70 IVA-20 IVT-80 IVValentine II VT-50 VIMT-25 VIILTG VIIILTTB IXT-54 ltwt. XT-100 LT
Medium Tanks IVA-32 IVT-28E with F-30 IVT-28 VMatilda IV VT-34 VIA-43 VIT-34-85M VIT-34-85 Rudy VIT-34-85 VIIA-44 VIIKV-13 VIIT-43 VIIT-44-122 VIIIObject 416 VIIIT-54 first prototype VIIIT-44-100 (R) VIIIT-44 IXObject 430 Version II IXT-54 XObject 140 XObject 430 XObject 907 XT-22 medium XT-62A
Heavy Tanks VChurchill III VKV-1S VKV-220-2 VKV-220-2 Beta Test VKV-1 VIKV-2 VIKV-85 VIT-150 VIIIS VIIKV-3 VIIKV-122 VIIIS-2 VIIIIS-3 VIIIIS-6 VIIIKV-5 VIIIKV-4 VIIIIS-5 (Object 730) VIIIIS-3A VIIIKV-4 Kreslavskiy VIIIObject 252U Defender VIIIObject 252U IXT-10 IXST-I XIS-4 XIS-7 XObject 260
Tank Destroyers IIAT-1 IIISU-76M IIISU-76I IVSU-85B VSU-85 VSU-85I VISU-100 VISU-100Y VIIISU-122S VIISU-152 VIISU-100M1 VIISU-122-44 VIIIISU-152 VIIIISU-130 VIIISU-101 IXObject 704 IXSU-122-54 XObject 263 XObject 268
Self-Propelled Artillery IISU-18 IIISU-26 IVSU-5 VSU-122A VISU-8 VIIS-51 VIISU-14-1 VIIISU-14-2 IX212A XObject 261
Self-Propelled Guns
USA IIT1 HMC IIIT18 HMC IIIM7 Priest IVT82 HMC IVM37 VM41 HMC VIM44 VIIM12 VIIIM40/M43 IXM53/M55 XT92 HMC
UK IILoyd Gun Carriage IIISexton II IIISexton I IVBirch Gun VBishop VIFV304 VIICrusader 5.5-in. SP VIIIFV207 IXFV3805 XConqueror Gun Carriage
Germany IIG.Pz. Mk. VI (e) IIISturmpanzer I Bison IIIWespe IVPz.Sfl. IVb IVSturmpanzer II VGrille VIHummel VIIG.W. Panther VIIIG.W. Tiger (P) IXG.W. Tiger XG.W. E 100
France IIRenault FT 75 BS IIILorraine 39L AM IVAMX 105 AM mle. 47 VAMX 13 105 AM mle. 50 V105 leFH18B2 VIAMX 13 F3 AM VIILorraine 155 mle. 50 VIIILorraine 155 mle. 51 IXBat.-Châtillon 155 55 XBat.-Châtillon 155 58
USSR IISU-18 IIISU-26 IVSU-5 VSU-122A VISU-8 VIIS-51 VIISU-14-1 VIIISU-14-2 IX212A XObject 261
China
Japan
Czechoslovakia
Sweden