IS-1 - Revision history

U54672993: /* Pros and cons */ adding a con about a shot trap that exists when playing the IS-1

2024-10-15T05:15:35Z

‎Pros and cons: adding a con about a shot trap that exists when playing the IS-1

U44629479: /* Survivability and armour */ Edits

2024-04-17T16:22:21Z

‎Survivability and armour: Edits

U9202753: New Specs-Card Artimage (new IS-1 model). Old picture moved to Media: Images

2024-02-23T09:48:49Z

New Specs-Card Artimage (new IS-1 model). Old picture moved to Media: Images

U38088265: /* Armaments */ Updated

2023-10-21T20:57:57Z

‎Armaments: Updated

U74396666: Minor consistency update

2023-09-21T18:48:17Z

Minor consistency update

U38088265: /* Description */

2023-09-16T10:15:32Z

‎Description

U74396666: New Description Project - USSR Priority: Tanks - IS-1

2023-09-15T06:41:32Z

New Description Project - USSR Priority: Tanks - IS-1

U122640064: added info to the machine guns section of the is1.

2023-06-05T00:19:14Z

added info to the machine guns section of the is1.

U44629479: Moved to proper section

2023-03-19T21:06:03Z

Moved to proper section

U74396666: Re-writing the entire pros and cons as the previous version is not comprehensive.

2023-03-19T09:08:06Z

Re-writing the entire pros and cons as the previous version is not comprehensive.

@@ Line 146: / Line 146: @@
 * Commander cupola is a big weak spot
 * Poor gun depression (a common trait in all Soviet tanks)
 == History ==

@@ Line 25: / Line 25: @@
 ! 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
+| Hull || 120 mm (35°) ''Front plate'' <br> 60 mm (75°) ''Front glacis'' <br> 100 mm (28-36°) ''Lower glacis'' || 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''

@@ Line 1: / Line 1: @@
 {{Specs-Card
 |code=ussr_is_1
-|images={{Specs-Card-Image|GarageImage_{{PAGENAME}}.jpg|ArtImage_{{PAGENAME}}.png}}
+|images={{Specs-Card-Image|GarageImage_{{PAGENAME}}.jpg|ArtImage2_{{PAGENAME}}.png}}
 }}
@@ Line 177: / Line 177: @@
 == Media ==
 <!-- ''Excellent additions to the article would be video guides, screenshots from the game, and photos.'' -->
 ;Skins

@@ Line 64: / Line 64: @@
 |-
 ! ''Arcade''
-| rowspan="2" | 59 || rowspan="2" | -5°/+25° || rowspan="2" | ±180° || rowspan="2" | N/A || 11.33 || 15.68 || 19.04 || 21.06 || 22.40 || rowspan="2" | 9.62 || rowspan="2" | 8.51 || rowspan="2" | 7.84 || rowspan="2" | 7.40
+| rowspan="2" | 59 || rowspan="2" | -5°/+25° || rowspan="2" | ±180° || rowspan="2" | - || 11.7 || 16.1 || 19.6 || 21.7 || 23.0 || rowspan="2" | 9.62 || rowspan="2" | 8.51 || rowspan="2" | 7.84 || rowspan="2" | 7.40
 |-
 ! ''Realistic''
-| 8.33 || 9.80 || 11.90 || 13.16 || 14.00
+| 8.6 || 10.1 || 12.2 || 13.5 || 14.4
 |-
 |}
@@ Line 100: / Line 100: @@
 <!-- ''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)}}
-The IS-1 has no roof-mounted heavy machine gun lime they are found in later Soviet heavy tanks and SPGs to defend against incoming enemy aircraft. The only machine gun available is a 7.62 mm coaxial MG. Useful for taking out unarmored trucks and exposed crew.
+The IS-1 has no roof-mounted heavy machine gun lime they are found in later Soviet heavy tanks and SPGs to defend against incoming enemy aircraft. The only machine gun available is a 7.62 mm coaxial MG. Useful for taking out unarmoured trucks and exposed crew.
 {| class="wikitable" style="text-align:center" width="50%"
@@ Line 108: / Line 108: @@
 ! Mount !! Capacity (Belt) !! Fire rate !! Vertical !! Horizontal
 |-
-| Coaxial || 1,890 (63) || 600 || N/A || N/A
+| Coaxial || 2,520 (63) || 600 || - || -
 |-
 |}

@@ Line 6: / Line 6: @@
 == Description ==
 <!-- ''In the description, the first part should 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 a screenshot of the vehicle, so that if the novice player does not remember the vehicle by name, he will immediately understand what kind of vehicle the article is talking about.'' -->
-The '''IS-1''' is the first variant of the IS tank family. The new IS-1 was intended to overcome the lack of firepower and protection issues of the KV series with a whole new sloped hull design. This was a strong armour design intended to deflect or withstand projectiles from all sides. The only major design requirement was that the weight not surpass that of the interim [[KV-85]]. The new armament was the same as the KV-85, an outstanding 85 mm D-5T tank gun with significantly higher range and muzzle velocity than prior Soviet heavy tanks. The turret was also identical to that of the KV-85, with three crews. The drivetrain was similar to that of the KV-85, with enormous tracks supported by three pairs of double return rollers and six double-tired wheels suspended by massive torsion arms. Extra fuel tanks were fitted to the rear of the hull, as with all earlier heavy tanks, and massive mudguards housed storage boxes. The engine was replaced with a new V2-IS 12-cylinder diesel engine producing 520 horsepower. The typical top speed was 37 km/h, and the practical range was only 150 km. Chelyabinsk Kirov Plant was responsible for the IS-1 manufacturing, and the first IS-1 rolled off the line in October 1943, but production was halted in January 1944 as the IS-1 was swiftly replaced by the all-round better [[IS-2]]. As a result, only 200-207 units were produced in total.
+The '''IS-1''' is the first variant of the IS heavy tank family. The new IS-1 was intended to overcome the lack of firepower and protection issues of the KV series with a whole new sloped hull design. This was a strong armour design intended to deflect or withstand projectiles from all sides. The only major design requirement was that the weight not surpass that of the interim [[KV-85]]. The new armament was the same as the KV-85, an outstanding 85 mm D-5T tank gun with significantly higher range and muzzle velocity than prior Soviet heavy tanks. The turret was also identical to that of the KV-85, with three crews. The drivetrain was similar to that of the KV-85, with enormous tracks supported by three pairs of double return rollers and six double-tired wheels suspended by massive torsion arms. Extra fuel tanks were fitted to the rear of the hull, as with all earlier heavy tanks, and massive mudguards housed storage boxes. The engine was replaced with a new V2-IS 12-cylinder diesel engine producing 520 horsepower. The typical top speed was 37 km/h, and the practical range was only 150 km. Chelyabinsk Kirov Plant was responsible for the IS-1 manufacturing, and the first IS-1 rolled off the line in October 1943, but production was halted in January 1944 as the IS-1 was swiftly replaced by the all-round better [[IS-2]]. As a result, only 200-207 units were produced in total.
 Introduced in the Closed Beta Test for Ground Forces before Update 1.41, the IS-1 has slightly superior hull protection than the interim KV-85. Tank shells can be easily deflected at long ranges thanks to a unique sloped frontal hull. However, the hull's lower front armour plate remains a weakness, and nearly all opponents in its rank are able to penetrate it. The visual characteristics of the IS-1 are also comparable to those of the KV-85. Players who have previously played the KV-85 should have little difficulty adjusting to this vehicle. The IS-1, unlike its predecessor, was developed with the purpose of breaching enemy heavy defences and engaging hostile armoured vehicles in mind and, as such, has thicker sloping armour, a slightly longer chassis, a more powerful 85 mm D-5T tank gun, and a larger, rounder turret.

@@ Line 14: / Line 14: @@
 {{Specs-Tank-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 helpful for survival in combat? If necessary use a visual template to indicate the most secure and weak zones of the armour.'' -->
 '''Armour type:'''
@@ Line 38: / Line 40: @@
 {{Specs-Tank-Mobility}}
 <!-- ''Write about the mobility of the ground vehicle. Estimate the specific power and manoeuvrability, as well as the maximum speed forwards and backwards.'' -->
 {{tankMobility|abMinHp=671|abMaxHp=827|rbMinHp=460}}
@@ Line 50: / Line 53: @@
 <!-- ''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 flexibility 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" width="100%"
@@ Line 96: / Line 100: @@
 <!-- ''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" width="50%"
@@ Line 110: / Line 115: @@
 <!-- ''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 instead 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 on engaging hostile armoured vehicles as well as a breakthrough 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 reloads speed of the 85 mm 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 better-protected targets, the IS tank (although equipped with the same type of cannon) has access to APCR rounds to better deal with heavier opponents, something the KV and T-34 models lack.
+As the tank's design purpose suggests, the IS-1 is a heavy tank built with an emphasis on engaging hostile armoured vehicles as well as a breakthrough tank. It has a relatively similar playstyle compared to the previous [[KV-85]] tank, reducing the learning curve. The fast reloads speed of the 85 mm 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 better-protected targets, the IS tank (although equipped with the same type of cannon) has access to APCR rounds to better deal with 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 a lighter vehicle cannot.
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 '''Pros:'''
-* Excellent armour overall; a strong well sloped turret that can bounce a few shells with a improved hull compared to [[KV-85]].
+* Good armour
-* A very strong and potent cannon for this BR range that can deal with a range of enemies with relative ease; careful aiming is required against Tiger I and Panther.
+* Extremely durable against in down-tiered battles (when encountering lower rank M4 Shermans, Valentines, Pz.IV etc.)
-* Unique curvature of the upper front portion of hull armour that can sometimes effectively bounce incoming shells from high penetrating cannons.
+* Re-positioning of fuel tanks reducing chances of fires.
-* Good overall mobility and maneuverability for a heavy tank; respectable reverse speed that allows getting back to cover fast enough to avoid returning fire.
+* Good mobility with a fast reverse speed
-* Relatively similar play style compared to the previous [[KV-85]] tank; small learning curve.
+* Sufficient firepower
 '''Cons:'''
-* Huge and ease to hit commander cupola that will easily destroy the tank by enemies firing APHE shells.
+* Large tank (slightly longer than the KV-1)
-* Impossible to angle the tank due to the unique curvature of the upper front portion of hull armour; while it serves to be an advantage when facing directly forward, any angling will be counterproductive, turning the upper front portion of the hull armour to a major weak spot.
+* Difficult to angle armour due to weaker hull cheeks
-* Taking too many ammunition will risk easy explosion from penetrating enemy tank shells due to widespread storage of tank ammunition around the hull and in turret.
+* Turret cheeks are easy to penetrate even at long distance
-* No roof mounted HMG that are found in later Soviet heavy tanks and SPGs to defend against incoming enemy aircraft.
+* Commander cupola is a big weak spot
-* Poor gun depression (a common trait in all Soviet tanks) makes fighting in mountainous terrain very difficult.
+* Poor gun depression (a common trait in all Soviet tanks)
 == History ==
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 ;Skins
 * [https://live.warthunder.com/feed/camouflages/?vehicle=ussr_is_1 Skins and camouflages for the {{PAGENAME}} from live.warthunder.com.]