Difference between revisions of "IS-1"

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== Description ==
 
== Description ==
−
''In the description, the first part needs to be about the history of the creation and combat usage of the vehicle, as well as its key features. In the second part, tell the reader about the ground vehicle in the game. Insert the screenshot of the vehicle. If the novice player does not remember the vehicle by name, they will immediately understand what kind of vehicle it is talking about.''
+
<!--''In the description, the first part needs to be about the history of the creation and combat usage of the vehicle, as well as its key features. In the second part, tell the reader about the ground vehicle in the game. Insert the screenshot of the vehicle. If the novice player does not remember the vehicle by name, they will immediately understand what kind of vehicle it is talking about.''-->
 +
[[File:GarageImage_IS-1.jpg|420px|thumb|left]]
 +
{{break}}
 +
The '''IS-1''' is a Rank III Soviet heavy tank with a battle rating of 5.3. It was introduced during the closed beta testing for Ground Forces before Update 1.41. It is the first unlockable IS series heavy tank.
 +
 
 +
Operational and visual characteristics of the IS-1 retain the visual and operational similarities to the previous KV line of heavy tanks of which it is descended from. Players experienced in operating previous models of the KV series of tanks should have little to no difficulty in adjusting to this vehicle. Unlike its predecessor, the IS series of tanks are designed with a priority of engaging enemy armoured vehicles in mind and as such, come with increased yet more sloped armour than its KV predecessors whilst sporting a slightly longer chassis, more powerful 85mm D-5T gun and a larger, rounded turret.
  
 
== General info ==
 
== General info ==
 
=== Survivability and armour ===
 
=== Survivability and armour ===
−
''Describe armour protection. Note the most well protected and key weak areas. Appreciate the layout of modules as well as the number and location of crew members. Is the level of armour protection sufficient, is the placement of modules helpfull for survival in combat?''
+
<!--''Describe armour protection. Note the most well protected and key weak areas. Appreciate the layout of modules as well as the number and location of crew members. Is the level of armour protection sufficient, is the placement of modules helpfull for survival in combat?''
  
−
''If necessary use a visual template to indicate the most secure and weak zones of the armour.''
+
''If necessary use a visual template to indicate the most secure and weak zones of the armour.''-->
 +
'''Armour type:'''
 +
* Cast homogeneous armour (Front hull, Turret)
 +
* Rolled homogeneous armour (Rear hull, Gun mantlet)
 +
{| class="wikitable"
 +
|-
 +
! Armour !! Front !! Sides !! Rear !! Roof
 +
|-
 +
| Hull || 120 mm (35°) ''Front plate'' <br> 60 mm (75°) ''Front glacis'' <br> 100 mm (28-36°) ''Lower glais'' || 100 mm (11-27°)''Top front'' <br> 90 mm (11°) ''Top rear'' <br> 90 mm ''Bottom'' || 60 mm (48°) ''Top'' <br> 60 mm (35°) ''Lower'' || 30 mm
 +
|-
 +
| Turret || 100 mm (0-89°) ''Turret front'' <br> 100 mm (4-59°) ''Gun mantlet'' || 100 mm (19-21°) || 100 mm (2-36°) || 30 mm <br> 35 mm ''Turret hatches''
 +
|-
 +
! Armour !! Sides !! Roof
 +
|-
 +
| Cupola || 90 mm || 35 mm
 +
|-
 +
|}
 +
'''Notes:'''
 +
* Suspension wheels are 20 mm thick and tracks are 30 mm thick.
 +
* Though the front plate is 120 mm thick, it is not very sloped in comparison to the front glacis. Despite front glacis 60 mm thickness, slope effect up to ~130 mm and ricochet chances improves protection.
  
 
=== Mobility ===
 
=== Mobility ===
−
''Write about the mobility of the ground vehicle. Estimate the specific power and maneuverability as well as the maximum speed forward and backward.''
+
<!--''Write about the mobility of the ground vehicle. Estimate the specific power and maneuverability as well as the maximum speed forward and backward.''-->
 +
{| class="wikitable" style="text-align:center"
 +
|-
 +
!colspan="3" | Mobility characteristic
 +
|-
 +
! Weight (tons)
 +
!colspan="1" | Add-on Armor<br>weight (tons)
 +
!colspan="1" | Max speed (km/h)
 +
|-
 +
|rowspan="2" | 44.0 || colspan="1" rowspan="2" | N/A || colspan="1" | 45 (AB)
 +
|-
 +
|42 (RB/SB)
 +
|-
 +
!colspan="3" | Engine power (horsepower)
 +
|-
 +
!colspan="1" | Mode
 +
!Stock
 +
!Upgraded
 +
|-
 +
|''Arcade''
 +
|671
 +
|827
 +
|-
 +
|''Realistic/Simulator''
 +
|460
 +
|520
 +
|-
 +
!colspan="3" | Power-to-weight ratio (hp/ton)
 +
|-
 +
!colspan="1" | Mode
 +
!Stock
 +
!Upgraded
 +
|-
 +
|''Arcade''
 +
|15.25
 +
|18.79
 +
|-
 +
|''Realistic/Simulator''
 +
|10.45
 +
|11.82
 +
|-
 +
|}
  
 
== Armaments ==
 
== Armaments ==
 
=== Main armament ===
 
=== Main armament ===
−
''Give the reader information about the characteristics of the main gun. Assess its effectiveness in a battle based on the reloading speed, ballistics and the power of shells. Do not forget about the flexibilty of the fire, that is how quickly the cannon can be aimed at the target, open fire on it and aim at another enemy. Add a link to the main article on the gun: <code><nowiki>{{main|Name of the weapon}}</nowiki></code>. Describe in general terms the ammunition available for the main gun. Give advice on how to use them and how to fill the ammunition storage.''
+
<!--''Give the reader information about the characteristics of the main gun. Assess its effectiveness in a battle based on the reloading speed, ballistics and the power of shells. Do not forget about the flexibilty of the fire, that is how quickly the cannon can be aimed at the target, open fire on it and aim at another enemy. Add a link to the main article on the gun: <code><nowiki>{{main|Name of the weapon}}</nowiki></code>. Describe in general terms the ammunition available for the main gun. Give advice on how to use them and how to fill the ammunition storage.''-->
 +
{{main|D-5T (85 mm)}}
 +
 
 +
{| class="wikitable" style="text-align:center"
 +
|-
 +
! colspan="6" | [[D-5T (85 mm)|85 mm D-5T]]
 +
|-
 +
! colspan="3" rowspan="1" style="width:5em" |Capacity
 +
! rowspan="1" | Vertical <br> guidance
 +
! rowspan="1" | Horizontal <br> guidance
 +
! rowspan="1" | Stabilizer
 +
 
 +
|-
 +
| colspan="3" | 59 || -5°/+25° || ±180° || N/A
 +
|-
 +
! colspan="6" | Turret rotation speed (°/s)
 +
|-
 +
! style="width:4em" |Mode
 +
! style="width:4em" |Stock
 +
! style="width:4em" |Upgraded
 +
! style="width:4em" |Prior + Full crew
 +
! style="width:4em" |Prior + Expert qualif.
 +
! style="width:4em" |Prior + Ace qualif.
 +
|-
 +
| ''Arcade'' || 8.30 || 11.50 || 24.0 || 26.60 || 28.20
 +
|-
 +
| ''Realistic'' || 8.30 || 9.80 || _.__ || _.__ || _.__
 +
|-
 +
! colspan="4" | Reloading rate (seconds)
 +
|-
 +
! colspan="1" style="width:4em" |Stock
 +
! colspan="1" style="width:4em" |Prior + Full crew
 +
! colspan="1" style="width:4em" |Prior + Expert qualif.
 +
! colspan="1" style="width:4em" |Prior + Ace qualif.
 +
|-
 +
| 9.60 || _.__ || _.__ || _.__
 +
|-
 +
|}
 +
 
 +
===== Ammunition =====
 +
{| class="wikitable sortable" style="text-align:center" width="100%"
 +
! colspan="8" | Penetration statistics
 +
|-
 +
! rowspan="2" data-sort-type="text" | Ammunition
 +
! rowspan="2" class="unsortable" | Type of <br /> warhead
 +
! colspan="6" | '''Penetration''' '''''in mm''''' '''@ 90°'''
 +
|-
 +
! 10m
 +
! 100m
 +
! 500m
 +
! 1000m
 +
! 1500m
 +
! 2000m
 +
|-
 +
| BR-365A || APHEBC || 142 || 139 || 123 || 105 || 91 || 81
 +
|-
 +
| BR-365K || APHE || 145 || 142 || 125 || 107 || 92 || 78
 +
|-
 +
| O-365K || HE || 9 || 9 || 9 || 9 || 9 || 9
 +
|-
 +
| BR-365P || APCR || 180 || 175 || 136 || 100 || 73 || 54
 +
|-
 +
|}
 +
{| class="wikitable sortable" style="text-align:center" width="100%"
 +
! colspan="10" | Shell details
 +
|-
 +
! rowspan="2" data-sort-type="text" | Ammunition
 +
! rowspan="2" |Velocity <br /> in m/s
 +
! rowspan="2" |Projectile<br />Mass in kg
 +
! rowspan="2" | ''Fuse delay''
 +
''in m:''
 +
! rowspan="2" | ''Fuse sensitivity''
 +
''in mm:''
 +
! rowspan="2" | ''Explosive Mass in g<br /> (TNT equivalent):''
 +
! rowspan="2" | ''Normalization At 30° <br> from horizontal:''
 +
! colspan="3" | ''Ricochet:''
 +
|-
 +
! 0%
 +
! 50%
 +
! 100%
 +
|-
 +
| BR-365A || 792 || 9.2 || 1.2 || 15 || 164 || +4° || 48° || 63° || 71°
 +
|-
 +
| BR-365K || 792 || 9.2 || 1.2 || 15 || 81.6 || -1° || 47° || 60° || 65°
 +
|-
 +
| O-365K || 780 || 9.5 || 0.1 || 0.3 || 646 || +0° || 79° || 80° || 81°
 +
|-
 +
| BR-365P || 1030 || 5.4 || N/A || N/A || N/A || +1.5° || 66° || 70° || 72°
 +
|-
 +
|}
 +
 
 +
===== [[Ammo Racks|Ammo racks]] =====
 +
[[File:Ammoracks_IS-1.png|right|thumbnail|x250px|[[Ammo Racks|Ammo racks]] of the IS-1.]]
 +
{| class="wikitable sortable" style="text-align:center"
 +
|-
 +
! class="wikitable unsortable" |Full<br /> ammo
 +
! class="wikitable unsortable" |1st<br />  rack empty
 +
! class="wikitable unsortable" |2nd<br />  rack empty
 +
! class="wikitable unsortable" |3rd<br />  rack empty
 +
! class="wikitable unsortable" |4th<br />  rack empty
 +
! class="wikitable unsortable" |5th<br />  rack empty
 +
! class="wikitable unsortable" |6th<br />  rack empty
 +
! class="wikitable unsortable" |7th<br />  rack empty
 +
! class="wikitable unsortable" |Visual<br /> discrepancy
 +
|-
 +
|| '''59''' || 42&nbsp;''(+17)'' || 37&nbsp;''(+22)'' || 32&nbsp;''(+27)'' || 27&nbsp;''(+32)'' || 24&nbsp;''(+35)'' || 11&nbsp;''(+48)'' || 1&nbsp;''(+58)'' || style="text-align:left" | no
 +
|-
 +
|}
  
−
=== Additional armament ===
+
Turret empty: 37&nbsp;(+22)
−
''Some tanks are armed with several guns in one or more turrets. Evaluate the additional weaponry and give advice on its use. Describe the ammunition available for additional weaponry. Give advice on how to use them and how to fill the ammunition storage. If there is no additional weaponry remove this subsection.''
 
  
 
=== Machine guns ===
 
=== Machine guns ===
−
''Offensive and anti-aircraft machine guns not only allow you to fight some aircraft, but also are effective against lightly armoured vehicles. Evaluate machine guns and give recommendations on its use.''
+
<!--''Offensive and anti-aircraft machine guns not only allow you to fight some aircraft, but also are effective against lightly armoured vehicles. Evaluate machine guns and give recommendations on its use.''-->
 +
{{main|DT (7.62 mm)}}
 +
 
 +
{| class="wikitable" style="text-align:center"
 +
|-
 +
! colspan="7" | [[DT (7.62 mm)|7.62 mm DT]]
 +
|-
 +
! colspan="7" | ''Coaxial mount''
 +
|-
 +
! colspan="4" rowspan="1" style="width:5em" |Capacity (Belt capacity)
 +
! rowspan="1" | Fire rate <br> (shots/minute)
 +
! rowspan="1" | Vertical <br> guidance
 +
! rowspan="1" | Horizontal <br> guidance
 +
|-
 +
| colspan="4" | 1,890 (63) || 600 || N/A || N/A
 +
|-
 +
|}
  
 
== Usage in the battles ==
 
== Usage in the battles ==
−
''Describe the tactics of playing in the vehicle, the features of using vehicles in the team and advice on tactics. Refrain from creating a "guide" - do not impose a single point of view but give the reader food for thought. Describe the most dangerous enemies and give recommendations on fighting them. If necessary, note the specifics of the game in different modes (AB, RB, SB).''
+
<!--''Describe the tactics of playing in the vehicle, the features of using vehicles in the team and advice on tactics. Refrain from creating a "guide" - do not impose a single point of view but give the reader food for thought. Describe the most dangerous enemies and give recommendations on fighting them. If necessary, note the specifics of the game in different modes (AB, RB, SB).''-->
 +
As the tank's design purpose suggests, the IS-1 is a heavy tank built with an emphasis of engaging hostile armoured vehicles as well as a break-through tank. The tanks heavy armour has similar properties of its previous KV-1 line, but the introduction of sloped armour on the front plate and turret mantlet can allow operators to withstand a significant amount of damage at most ranges, especially when armour is angled. The fast reload speed of the 85mm gun (on par with its T-34 and KV-85 mounted sisters) also allows it to be an effective brawler in close quarters combat against multiple targets. When encountering more well protected targets, the IS tank (although equipped with the same type of cannon) has access to APCR rounds to better deal with more heavier opponents, something the KV and T-34 models lack.
 +
 
 +
Although classified as a heavy tank and an upgraded improved design over the KV predecessor, the tank is not invulnerable. The vehicle's armour thickness is quite effective in its class.  Unlike its Tiger rivals and KV predecessors the IS-1 has better or equal thickness armour on almost all sides except the rear hull and is sloped increasing the chance of ricochet and damage reduction when struck. Of note is the large turret and exposed turret mount which is commonly targeted at engaging hostile vehicles from the front. Armaments and ammunition options aside, the IS tank can perform similarly if not better at engaging targets than the common T-34, albeit with more satisfactory armour protection, able to allow users to lead a charge from the front with relative confidence or provide fire support from the sides or rear. This tank is quite sufficient in holding its own on the battlefield in many situations where more lighter vehicle cannot.
 +
 
 +
Another significant note of this vehicle is its considerably fast reverse rate, the highest of its Rank and Battle-Rating for the nation's faction, topping at 17 km/h. During situations where close-quarters engagement is expected, an unorthodox strategy can be utilized when the operator of the IS tank re-positions the vehicle 90 degrees and drive in reverse towards the enemy. By driving in reverse with the rear facing the opposition, the engine blocks make a crude yet somewhat effective shield and protecting the more delicate crew. As the fuel tanks are mostly stored at the front on the left and right side of the driver's station, the risk of fire and fuel-tank explosion is reduced significantly (but not completely eliminated) and thus, the tank is able to resist even the most powerful of shots. Be aware that more experienced players may attempt to instead fire at the more exposed turret of the IS tank and instantly killing the crew with a common APHE penetrating shell.
 +
 
 +
When engaging the common Tiger tank and Panzer IV models, each of these vehicles retain the design flaw of 90 degree flat armour plates on the front and sides of each respective vehicle. The IS-1's 85mm cannon should have little no difficulty in penetrating this and destroying the opposition's vehicle in a single shot if this weakness is exploited. The Panther and occasional Tiger II models are more considerably dangerous and difficult to dispatch when encountering them head-on due to the thicker and sloped armour of which the 85mm cannon of the IS-1 cannot penetrate. In head-on engagements, operators of this vehicle should note to precisely target the right and left side turret mantlet of each respective vehicles instead. Time expended in attempting to find a penetration confirmation indication on the cross-hair when inspecting the sloped front plate is time wasted and instead, should be diverted on precise targeting of the mantlet.  Other more common tanks such as opposition USSR KV, IS and T-34 models are usually less of a concern than the common Panther tank, as most of these respective tanks also inherit the weakness of somewhat slopped frontal chassis and turret armour which can be easily penetrated even from significant distances with a precise aim.
  
 
=== Pros and cons ===
 
=== Pros and cons ===
−
''Summarize and briefly evaluate the vehicle in terms of its characteristics and combat effectiveness. Mark its pros and cons in a bulleted list. Do not use more than 6 points for each of the characteristics. Avoid using categorical definitions such as "bad", "good" and the like - they have a substitution in the form of softer "inadequate", "effective".''
+
<!--''Summarize and briefly evaluate the vehicle in terms of its characteristics and combat effectiveness. Mark its pros and cons in a bulleted list. Do not use more than 6 points for each of the characteristics. Avoid using categorical definitions such as "bad", "good" and the like - they have a substitution in the form of softer "inadequate", "effective".''-->
−
 
 
 
'''Pros:'''
 
'''Pros:'''
−
*
+
* Good armour.
−
 
+
* Sufficient firepower.
 +
* High rate of fire
 +
* Good mobility.
 +
* Significantly fast reverse speed.
 +
* Ability to fire APCR.
 +
* Extremely durable against in down-tiered battles (when encountering lower-tier M4 Shermans, Valentines, Pz.IV etc.)
 +
* Re-positioning of fuel tanks reducing chances of fires.
 +
* Player skill compatibility between older and newer KV and IS models.
 
'''Cons:'''
 
'''Cons:'''
−
*
+
* Poor gun depression (common trait in all USSR tanks).
 +
* Large silhouette and profile (slightly longer than its KV predecessor)
 +
* Difficult to angle armour due to weaker hull cheeks.
  
 
== History ==
 
== History ==
−
''Describe the history of the creation and combat usage of the ground vehicle in more detail than in the introduction. If the historical reference turns out to be too big, take it to a separate article, taking a link to an article about the vehicle and adding a block "/historical reference" (example: https://wiki.warthunder.com/Name-vehicles/historical reference) and add a link to it here using the <code>main</code> template. Be sure to include links to sources at the end of the article.''
+
<!--''Describe the history of the creation and combat usage of the ground vehicle in more detail than in the introduction. If the historical reference turns out to be too big, take it to a separate article, taking a link to an article about the vehicle and adding a block "/historical reference" (example: https://wiki.warthunder.com/Name-vehicles/historical reference) and add a link to it here using the <code>main</code> template. Be sure to include links to sources at the end of the article.''-->
 +
===Development===
 +
The start of the development for a new heavy tank in the Red Army came from the many criticism of their current heavy tank, the [[KV-1 ZiS-5|KV-1]]. The KV-1 had poor mobility and a lack of firepower and armour advantage over the standard [[T-34 1942|T-34]], plus the KV-1 was more expensive to produce for no real advantage. Attempts to remedy this problem produced the ''KV-1S'' and the ''[[KV-85]]'', which tried to make the KV-1 more mobile, more ergonomic, and have better firepower. Though they were improvements over the original KV-1 design, it was already determined that the KV-1 designs are to be replaced by a new heavy tank design and the newer KV-1 developments were to be interim designs until the heavy tank development is complete.
 +
 
 +
The heavy tank project, code named ''Object 237'', had its basis from the cancelled KV-13 program and was restarted from the discovery of the [[Pz.Kpfw. VI Ausf. H1|Tiger I]] after one was captured in Leningrad, thus it began in January 1943. However, despite the ensuing development, the intense tank fighting in 1943 in Kursk and ensuing operations forced the Object 237 to see action early, with its turret used on the KV-85, which itself was built atop the KV-1S hull. The turret mounted the new 85 mm D-5T gun and would be a great firepower advantage enjoyed by the Soviet tank forces as it gave them a heavy tank with a comparable firepower to the Tiger I's 88 mm cannon. In the end of 1943, the Object 237 project was finished and was accepted into service as the '''IS-85''', or the '''IS-1''', named after Iosef (Joseph) Stalin, the current leader of the Soviet Union during World War II. The IS-1 began to be delivered in October 1943 and went into service in the same month. The IS-1 stayed in service until January 1944, when its production also ended with about 200 units produced.
 +
 
 +
===Combat usage===
 +
The IS-1, like the KV-85 before it, was a great assist to the Soviet tank forces, giving them a heavily armoured tank with a great 85 mm gun that could defeat most of the German tanks in service except their heaviest ones such as the [[Pz.Kpfw. VI Tiger Ausf. E|Tiger I]] and the [[Pz.Kpfw. V Ausf. D|Panther]] tanks. The IS-1 were issued to Guards Heavy Tank Regiments for service, most notably the 1st, 8th, and 13th Guards Heavy Tank Regiments which saw service in Ukraine and Slovakia.
 +
 
 +
The IS-1 had a short-lived production due to advances in Soviet tank technology. Their standard [[T-34 1942|T-34]] medium tanks were upgraded with the same 85 mm gun on the IS-1 into the [[T-34-85]]. The lack of firepower advantage the IS-1 now presented due to this upgrade prompted an up gunning of the IS tank with a much bigger gun. After further development in late 1943, the IS-1 evolved into the [[IS-2]], which has the larger and much more powerful 122 mm A-19 gun.
  
 
== Media ==
 
== Media ==
−
''An excellent addition to the article will be video guides, as well as screenshots from the game and photos.''
+
<!--''An excellent addition to the article will be video guides, as well as screenshots from the game and photos.''-->
 +
[http://live.warthunder.com/feed/camouflages/?q=%23is1 Skins and camouflages for the IS-1 from live.warthunder]
 +
 
 +
==References==
 +
<references />
  
 
== Read also ==
 
== Read also ==
Line 51: Line 266:
 
* ''topic on the official game forum;''
 
* ''topic on the official game forum;''
 
* ''other literature.''
 
* ''other literature.''
 +
 +
{{USSR heavy tanks}}

Revision as of 06:17, 17 October 2018

IS-1
ussr_is_1.png
IS-1
USSR flag.png USSR
III Rank
Battle rating:
AB RB SB
5.7 5.7 5.7
Class:
Research:40 000 Specs-Card-Exp.png
Purchase:135 000 Specs-Card-Lion.png
Show in game

Description

GarageImage IS-1.jpg


The IS-1 is a Rank III Soviet heavy tank with a battle rating of 5.3. It was introduced during the closed beta testing for Ground Forces before Update 1.41. It is the first unlockable IS series heavy tank.

Operational and visual characteristics of the IS-1 retain the visual and operational similarities to the previous KV line of heavy tanks of which it is descended from. Players experienced in operating previous models of the KV series of tanks should have little to no difficulty in adjusting to this vehicle. Unlike its predecessor, the IS series of tanks are designed with a priority of engaging enemy armoured vehicles in mind and as such, come with increased yet more sloped armour than its KV predecessors whilst sporting a slightly longer chassis, more powerful 85mm D-5T gun and a larger, rounded turret.

General info

Survivability and armour

Armour type:

  • Cast homogeneous armour (Front hull, Turret)
  • Rolled homogeneous armour (Rear hull, Gun mantlet)
Armour Front Sides Rear Roof
Hull 120 mm (35°) Front plate
60 mm (75°) Front glacis
100 mm (28-36°) Lower glais 		100 mm (11-27°)Top front
90 mm (11°) Top rear
90 mm Bottom 		60 mm (48°) Top
60 mm (35°) Lower 		30 mm
Turret 100 mm (0-89°) Turret front
100 mm (4-59°) Gun mantlet 		100 mm (19-21°) 100 mm (2-36°) 30 mm
35 mm Turret hatches
Armour Sides Roof
Cupola 90 mm 35 mm

Notes:

  • Suspension wheels are 20 mm thick and tracks are 30 mm thick.
  • Though the front plate is 120 mm thick, it is not very sloped in comparison to the front glacis. Despite front glacis 60 mm thickness, slope effect up to ~130 mm and ricochet chances improves protection.

Mobility

Mobility characteristic
Weight (tons) Add-on Armor
weight (tons) 		Max speed (km/h)
44.0 N/A 45 (AB)
42 (RB/SB)
Engine power (horsepower)
Mode Stock Upgraded
Arcade 671 827
Realistic/Simulator 460 520
Power-to-weight ratio (hp/ton)
Mode Stock Upgraded
Arcade 15.25 18.79
Realistic/Simulator 10.45 11.82

Armaments

Main armament

Main article: D-5T (85 mm)
85 mm D-5T
Capacity Vertical
guidance 		Horizontal
guidance 		Stabilizer
59 -5°/+25° ±180° N/A
Turret rotation speed (°/s)
Mode Stock Upgraded Prior + Full crew Prior + Expert qualif. Prior + Ace qualif.
Arcade 8.30 11.50 24.0 26.60 28.20
Realistic 8.30 9.80 _.__ _.__ _.__
Reloading rate (seconds)
Stock Prior + Full crew Prior + Expert qualif. Prior + Ace qualif.
9.60 _.__ _.__ _.__
Ammunition
Penetration statistics
Ammunition Type of
warhead 		Penetration in mm @ 90°
10m 100m 500m 1000m 1500m 2000m
BR-365A APHEBC 142 139 123 105 91 81
BR-365K APHE 145 142 125 107 92 78
O-365K HE 9 9 9 9 9 9
BR-365P APCR 180 175 136 100 73 54
Shell details
Ammunition Velocity
in m/s 		Projectile
Mass in kg 		Fuse delay

in m:

Fuse sensitivity

in mm:

Explosive Mass in g
(TNT equivalent): 		Normalization At 30°
from horizontal: 		Ricochet:
0% 50% 100%
BR-365A 792 9.2 1.2 15 164 +4° 48° 63° 71°
BR-365K 792 9.2 1.2 15 81.6 -1° 47° 60° 65°
O-365K 780 9.5 0.1 0.3 646 +0° 79° 80° 81°
BR-365P 1030 5.4 N/A N/A N/A +1.5° 66° 70° 72°
Ammo racks
Ammo racks of the IS-1.
Full
ammo 		1st
rack empty 		2nd
rack empty 		3rd
rack empty 		4th
rack empty 		5th
rack empty 		6th
rack empty 		7th
rack empty 		Visual
discrepancy
59 42 (+17) 37 (+22) 32 (+27) 27 (+32) 24 (+35) 11 (+48) 1 (+58) no

Turret empty: 37 (+22)

Machine guns

Main article: DT (7.62 mm)
7.62 mm DT
Coaxial mount
Capacity (Belt capacity) Fire rate
(shots/minute) 		Vertical
guidance 		Horizontal
guidance
1,890 (63) 600 N/A N/A

Usage in the battles

As the tank's design purpose suggests, the IS-1 is a heavy tank built with an emphasis of engaging hostile armoured vehicles as well as a break-through tank. The tanks heavy armour has similar properties of its previous KV-1 line, but the introduction of sloped armour on the front plate and turret mantlet can allow operators to withstand a significant amount of damage at most ranges, especially when armour is angled. The fast reload speed of the 85mm gun (on par with its T-34 and KV-85 mounted sisters) also allows it to be an effective brawler in close quarters combat against multiple targets. When encountering more well protected targets, the IS tank (although equipped with the same type of cannon) has access to APCR rounds to better deal with more heavier opponents, something the KV and T-34 models lack.

Although classified as a heavy tank and an upgraded improved design over the KV predecessor, the tank is not invulnerable. The vehicle's armour thickness is quite effective in its class. Unlike its Tiger rivals and KV predecessors the IS-1 has better or equal thickness armour on almost all sides except the rear hull and is sloped increasing the chance of ricochet and damage reduction when struck. Of note is the large turret and exposed turret mount which is commonly targeted at engaging hostile vehicles from the front. Armaments and ammunition options aside, the IS tank can perform similarly if not better at engaging targets than the common T-34, albeit with more satisfactory armour protection, able to allow users to lead a charge from the front with relative confidence or provide fire support from the sides or rear. This tank is quite sufficient in holding its own on the battlefield in many situations where more lighter vehicle cannot.

Another significant note of this vehicle is its considerably fast reverse rate, the highest of its Rank and Battle-Rating for the nation's faction, topping at 17 km/h. During situations where close-quarters engagement is expected, an unorthodox strategy can be utilized when the operator of the IS tank re-positions the vehicle 90 degrees and drive in reverse towards the enemy. By driving in reverse with the rear facing the opposition, the engine blocks make a crude yet somewhat effective shield and protecting the more delicate crew. As the fuel tanks are mostly stored at the front on the left and right side of the driver's station, the risk of fire and fuel-tank explosion is reduced significantly (but not completely eliminated) and thus, the tank is able to resist even the most powerful of shots. Be aware that more experienced players may attempt to instead fire at the more exposed turret of the IS tank and instantly killing the crew with a common APHE penetrating shell.

When engaging the common Tiger tank and Panzer IV models, each of these vehicles retain the design flaw of 90 degree flat armour plates on the front and sides of each respective vehicle. The IS-1's 85mm cannon should have little no difficulty in penetrating this and destroying the opposition's vehicle in a single shot if this weakness is exploited. The Panther and occasional Tiger II models are more considerably dangerous and difficult to dispatch when encountering them head-on due to the thicker and sloped armour of which the 85mm cannon of the IS-1 cannot penetrate. In head-on engagements, operators of this vehicle should note to precisely target the right and left side turret mantlet of each respective vehicles instead. Time expended in attempting to find a penetration confirmation indication on the cross-hair when inspecting the sloped front plate is time wasted and instead, should be diverted on precise targeting of the mantlet. Other more common tanks such as opposition USSR KV, IS and T-34 models are usually less of a concern than the common Panther tank, as most of these respective tanks also inherit the weakness of somewhat slopped frontal chassis and turret armour which can be easily penetrated even from significant distances with a precise aim.

Pros and cons

Pros:

  • Good armour.
  • Sufficient firepower.
  • High rate of fire
  • Good mobility.
  • Significantly fast reverse speed.
  • Ability to fire APCR.
  • Extremely durable against in down-tiered battles (when encountering lower-tier M4 Shermans, Valentines, Pz.IV etc.)
  • Re-positioning of fuel tanks reducing chances of fires.
  • Player skill compatibility between older and newer KV and IS models.

Cons:

  • Poor gun depression (common trait in all USSR tanks).
  • Large silhouette and profile (slightly longer than its KV predecessor)
  • Difficult to angle armour due to weaker hull cheeks.

History

Development

The start of the development for a new heavy tank in the Red Army came from the many criticism of their current heavy tank, the KV-1. The KV-1 had poor mobility and a lack of firepower and armour advantage over the standard T-34, plus the KV-1 was more expensive to produce for no real advantage. Attempts to remedy this problem produced the KV-1S and the KV-85, which tried to make the KV-1 more mobile, more ergonomic, and have better firepower. Though they were improvements over the original KV-1 design, it was already determined that the KV-1 designs are to be replaced by a new heavy tank design and the newer KV-1 developments were to be interim designs until the heavy tank development is complete.

The heavy tank project, code named Object 237, had its basis from the cancelled KV-13 program and was restarted from the discovery of the Tiger I after one was captured in Leningrad, thus it began in January 1943. However, despite the ensuing development, the intense tank fighting in 1943 in Kursk and ensuing operations forced the Object 237 to see action early, with its turret used on the KV-85, which itself was built atop the KV-1S hull. The turret mounted the new 85 mm D-5T gun and would be a great firepower advantage enjoyed by the Soviet tank forces as it gave them a heavy tank with a comparable firepower to the Tiger I's 88 mm cannon. In the end of 1943, the Object 237 project was finished and was accepted into service as the IS-85, or the IS-1, named after Iosef (Joseph) Stalin, the current leader of the Soviet Union during World War II. The IS-1 began to be delivered in October 1943 and went into service in the same month. The IS-1 stayed in service until January 1944, when its production also ended with about 200 units produced.

Combat usage

The IS-1, like the KV-85 before it, was a great assist to the Soviet tank forces, giving them a heavily armoured tank with a great 85 mm gun that could defeat most of the German tanks in service except their heaviest ones such as the Tiger I and the Panther tanks. The IS-1 were issued to Guards Heavy Tank Regiments for service, most notably the 1st, 8th, and 13th Guards Heavy Tank Regiments which saw service in Ukraine and Slovakia.

The IS-1 had a short-lived production due to advances in Soviet tank technology. Their standard T-34 medium tanks were upgraded with the same 85 mm gun on the IS-1 into the T-34-85. The lack of firepower advantage the IS-1 now presented due to this upgrade prompted an up gunning of the IS tank with a much bigger gun. After further development in late 1943, the IS-1 evolved into the IS-2, which has the larger and much more powerful 122 mm A-19 gun.

Media

Skins and camouflages for the IS-1 from live.warthunder

References


Read also

Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example,

  • reference to the series of the vehicles;
  • links to approximate analogues of other nations and research trees.

ETC.

Sources

Paste links to sources and external resources, such as:

  • topic on the official game forum;
  • other literature.


USSR heavy tanks
KV-1  KV-1 (L-11) · KV-1 (ZiS-5) · KV-1E · KV-1S
KV-2  KV-2 (1939) · KV-2 (1940) · KV-2 (ZiS-6)
Other KVs  KV-85 · KV-122 · KV-220
IS-1/2  IS-1 · IS-2 · IS-2 (1944) · IS-2 No.321 · IS-2 "Revenge" · Object 248
Other IS tanks  IS-3 · IS-4M · IS-6 · IS-7
T-10  T-10A · T-10M
Multi-turreted  T-35 · SMK
Other  Object 279
Lend-Lease  ▂MK-II "Matilda"

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