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S-51

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Revision as of 17:10, 18 September 2011Revision as of 00:38, 10 October 2011
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 The S-51 is a tier 6 USSR SPG widely called "Unicorn", and is the KV line counterpart to the [[SU-14]].  The S-51 is a tier 6 USSR SPG widely called "Unicorn", and is the KV line counterpart to the [[SU-14]].
  
?Out of the box, it's the same as the SU-14 in the gun department, as both use the same gun. It's rather slow when you first get it, performance will be sluggish but once upgraded mobility kicks in. Most players agree that the S-51 is superior to the SU-14 for these reasons; its mobility (especially when changing locations to avoid becoming a counterbattery target), its agility in running quickly 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. +Out of the box, it's the same as the SU-14 in the gun department. 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 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.
  
 It leads to [[Object 212]]  It leads to [[Object 212]]
Line 58:Line 58:
 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. 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. 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 adjusment: 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 un-altered 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 203mm 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.+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 203mm 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. [[image:S51 pic2.jpg|thumb|200px|right|S51 prototype]]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 caliber. 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. 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. [[image:S51 pic2.jpg|thumb|200px|right|S51 prototype]]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 caliber. 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.

Revision as of 00:38, 10 October 2011

S-51

Render
S-51
USSR SPG Tier VI
Totals
Cost 1,072,500  Credits
Health 380
Weight/Load Limit 50.5/52t
Crew
6
Mobility
Engine Power 500hp
Speed Limit 32km/h
Traverse Speed 17deg/s
Armor
Hull Armor 60/60/60mm
Armament
Damage 713-1188HP
Penetration 66-110mm
Rate of Fire 2.6-3.16r/m
Accuracy 0.42m
Aim time 5s
Gun Traverse 13deg/s
Gun Traverse Arc 12/12°
Gun Vertical Limits gunVerticalLimits
Ammo Capacity ammo
General
Chance of Fire 15%
View Range 440m
Signal Range 410m
Parent Contour-USSR-KV.png
Child Contour-noImage.png
Values Are Stock // Top
USSR-S-51.png

The S-51 is a tier 6 USSR SPG widely called "Unicorn", and is the KV line counterpart to the SU-14.

Out of the box, it's the same as the SU-14 in the gun department. 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 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.

It leads to Object 212
















Modules

Gun
Tr
Nm
Dam
Pen
RoF
Acr
Aim
Pr
Wt
07VII
152 mm BR-2
950/750/950(HP)
88/246/90(mm)
3-3.33(r/m)
0.43-0.45(m)
5.0(s)
00106 230 106 230 Credits.png
7 500 7 500(kg)
08VIII
203 mm B-4
1850/1450/1850(HP)
102/260/102(mm)
1.58-1.9(r/m)
0.48-0.50(m)
6.0(s)
00118 880 118 880 Credits.png
7 900 7 900(kg)

Turret
SPGs and TDs don't have turret modules

Engine
Tr
Nm
Pw
CoF
Pr
Wt
06VI
V-2K
0500 500(h.p.)
015 15%
00023 050 23 050 Credits.png
0750 750(kg)
07VII
V-2IS
0600 600(h.p.)
015 15%
00036 000 36 000 Credits.png
0750 750(kg)

Suspension
Tr
Nm
LL
Tv
Pr
Wt
05V
S-51
52.0 52.0(t)
017 17(d/s)
00007 300 7 300 Credits.png
12 500 12 500(kg)
06VI
S-51 bis
52.5 52.5(t)
019 19(d/s)
00017 300 17 300 Credits.png
12 500 12 500(kg)

Radio
Tr
Nm
SR
Pr
Wt
05V
10R
0410 410(m)
00003 660 3 660 Credits.png
0100 100(kg)
09IX
12RT
0700 700(m)
00033 600 33 600 Credits.png
0110 110(kg)

Historical Info

S51 prototype

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 203mm 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.
S51 prototype
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 caliber. 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 203-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.



Soviet Tanks
Light Tanks MS-1  • BT-2  • Tetrarch  • T-26  • T-60  • BT-7  • BT-SV  • LTP  • M3 Light  • T-127  • T-46  • T-70  • A-20  • T-50  • T-80  • Valentine II  • T-50-2  • MT-25
Medium Tanks A-32  • T-28  • Matilda IV  • T-34  • T-34-85  • A-43  • KV-13  • T-43  • A-44  • T-44  • Object 416  • T-54  • Object 430 II  • T-62A  • Object 140  • Object 430
Heavy Tanks Churchill III  • KV  • KV-1  • KV-220  • KV-220 Beta-Test  • KV-1S  • KV-2  • T-150  • IS  • KV-3  • IS-3  • IS-6  • KV-4  • KV-5  • IS-8  • ST-I  • IS-4  • IS-7
Tank Destroyers AT-1  • SU-76  • SU-85B  • SU-85  • SU-85I  • SU-100  • SU-100Y  • SU-100M1  • SU-122-44  • SU-152  • ISU-152  • SU-101  • Object 704  • SU-122-54  • Object 263  • Object 268
Self-Propelled Guns SU-18  • SU-26  • SU-5  • SU-122A  • SU-8  • S-51  • SU-14-1  • SU-14-2  • 212A  • Object 261



Self-Propelled Guns
USA II T1 HMC  • III T18 HMC  • III M7 Priest  • IV T82 HMC  • IV M37  • V M41 HMC  • VI M44  • VII M12  • VIII M40/M43  • IX M53/M55  • X T92 HMC
UK II Loyd Gun Carriage  • III Sexton II  • III Sexton I  Gold  • IV Birch Gun  • V Bishop  • VI FV304  • VII Crusader 5.5-in. SP  • VIII FV207  • IX FV3805  • X Conqueror Gun Carriage
Germany II G.Pz. Mk. VI (e)  • III Sturmpanzer I Bison  • III Wespe  • IV Pz.Sfl. IVb  • IV Sturmpanzer II  • V Grille  • VI Hummel  • VII G.W. Panther  • VIII G.W. Tiger (P)  • IX G.W. Tiger  • X G.W. E 100
France II Renault FT 75 BS  • III Lorraine 39L AM  • IV AMX 105 AM mle. 47  • V AMX 13 105 AM mle. 50  • V 105 leFH18B2  Gold  • VI AMX 13 F3 AM  • VII Lorraine 155 mle. 50  • VIII Lorraine 155 mle. 51  • IX Bat.-Châtillon 155 55  • X Bat.-Châtillon 155 58
USSR II SU-18  • III SU-26  • IV SU-5  • V SU-122A  • VI SU-8  • VII S-51  • VII SU-14-1  • VIII SU-14-2  • IX 212A  • X Object 261
China
Japan
Czechoslovakia
Sweden