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[Client Values; Actual values in
|350350 HP Hit Points|
|50.22/5249.71/52.5 t Weight Limit|
- Commander (Radio Operator)
|500600 hp Engine Power|
|30/8 km/h Speed Limit|
|1820 deg/s Traverse|
|9.9612.07 hp/t Power/Wt Ratio|
|60/60/60 mm Hull Armor|
|700/700/1050/1050/ HP Damage|
|38/38/52/52/ mm Penetration|
|r/m 2.4 r/m 1.15 Rate of Fire|
▼1207.5 Damage Per Minute
With 50% Crew: 0.855 m
With 50% Crew: 1.028 m
|s 5.4 s 6.3 Aim time|
|1212 deg/s Gun Traverse Speed|
|8° Gun Arc|
|-2°/+58°-2°/+58° Elevation Arc|
|3012 rounds Ammo Capacity|
|1515 % Chance of Fire|
|m 275 m 275 View Range|
|m 360 m 625 Signal Range|
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 its impressively long barrel when held upwards when aiming, 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.
The S-51 leads to the SU-14-2.
Modules / Available Equipment and Consumables
|Rate of fire
|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|
|Chance of Fire on Impact
Pros and Cons
- Highest damage in tier with 203mm gun (tied with the SU-14-1)
- 203mm gun has high vertical shell arc
- Relatively mobile for artillery; can relocate easily
- Stock gun has fast reload and good DPM; it is preferred choice of many players
- Very narrow gun traverse
- Very long reload time with top gun
- Very limited ammo capacity with top gun
- Very slow aim time and very low accuracy with top gun
- Entirely different play-style than the preceding KV-2, requiring SPG practice on other lines to be competent
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. Therefore, many people prefer stock 152mm gun for its much faster reload, higher accuracy, and better DPM. Low ammo count of only 12 rounds with the top gun means you can't carry much variety of ammo or you risk running out of a type. Bad accuracy and long aim time (which are both considerably worse on top gun) and - worst of all - very narrow gun traverse, means that you must pre-aim targets well in advance and choose your shots carefully, as you won't get many of them.
- The vehicle can hold the best gun, radio and engine in stock form, so you don't have to get the suspension.
- IF you want the 203 mm gun on this vehicle, you can research it first.
- 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 203mm gun, you should still research it. You will need it on the SU-14-2.
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.
Sources and External Links
|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|