IS-M

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IS-M

USSR | Heavy Tank | Tier VIII

Battle Tier

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Overview
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Well, the ones further down, of course.

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[Client Values; Actual values in

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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.

]

2,550,000   Cost

1400340 HP Hit Points

49.78/5627.94/60 t Weight Limit

Crew

1. Commander (Radio Operator)
2. Driver
3. Gunner
4. Loader

Mobility

650750 hp Engine Power

35/12 km/h Speed Limit

2426 deg/s Traverse

13.0626.84 hp/t Power/Wt Ratio

NoNo Pivot

Armor

// mm Hull Armor

100/100/100250/140/120 mm Turret Armor

Armament

{{#ifeq:ARMOR_PIERCING_CR|ARMOR_PIERCING|| {{#ifeq:HIGH_EXPLOSIVE|ARMOR_PIERCING|| AP/APCR/HE {{#ifeq:ARMOR_PIERCING_CR|ARMOR_PIERCING|| {{#ifeq:HIGH_EXPLOSIVE|ARMOR_PIERCING|| AP/APCR/HE Shells

1025/4800/608 1025/4800/608 Shell Cost

390/390/530390/390/530 HP Damage

175/217/61212/240/68 mm Penetration

| |}} | |}} 4.51 r/m  ▲ Standard Gun Reload Times Nominal: 13.3 s 50% Crew: 16.48 s 75% Crew: 14.39 s 100% Crew: 12.75 s Rammer: 11.48 s Vents: 12.47 s Both: 11.22 s Both and BiA: 10.98 s Both and Max Crew %: 10.52 s See Crew, Consumables, or Equipment for more information. | |}} | |}} 5.13 r/m  ▲ Standard Gun Reload Times Nominal: 11.7 s 50% Crew: 14.49 s 75% Crew: 12.66 s 100% Crew: 11.22 s Rammer: 10.1 s Vents: 10.97 s Both: 9.88 s Both and BiA: 9.66 s Both and Max Crew %: 9.26 s See Crew, Consumables, or Equipment for more information. Rate of Fire

| |}} | |}} 1758.9 ▲ Standard Gun Using Shell Type 1 (390 Damage): Theoretical Damage Per Minute Nominal DPM: 1758.9 50% Crew: 1419.6 75% Crew: 1626.3 100% Crew: 1833 100% Crew Vents: 1875.9 Rammer: 2035.8 Both: 2082.6 Both and BiA: 2129.4 Both and Max Crew %: 2219.1 Advantageous Damage Per Minute First-shot DPM: 2148.9 50% Crew: 1809.6 75% Crew: 2016.3 100% Crew: 2223 100% Crew Rammer: 2425.8 Vents: 2265.9 Both: 2472.6 Both and BiA: 2519.4 Both and Max Crew %: 2609.1 See here, here, or here for more information. ▼ Standard Gun Using Shell Type 2 (390 Damage): Theoretical Damage Per Minute Nominal DPM: 1758.9 50% Crew: 1419.6 75% Crew: 1626.3 100% Crew: 1833 100% Crew Vents: 1875.9 Rammer: 2035.8 Both: 2082.6 Both and BiA: 2129.4 Both and Max Crew %: 2219.1 Advantageous Damage Per Minute First-shot DPM: 2148.9 50% Crew: 1809.6 75% Crew: 2016.3 100% Crew: 2223 100% Crew Rammer: 2425.8 Vents: 2265.9 Both: 2472.6 Both and BiA: 2519.4 Both and Max Crew %: 2609.1 See here, here, or here for more information. ▲ Standard Gun Using Shell Type 3 (530 Damage): With wholly penetrating hits Theoretical Damage Per Minute Nominal DPM: 2390.3 50% Crew: 1929.2 75% Crew: 2210.1 100% Crew: 2491 100% Crew Vents: 2549.3 Rammer: 2766.6 Both: 2830.2 Both and BiA: 2893.8 Both and Max Crew %: 3015.7 Advantageous Damage Per Minute First-shot DPM: 2920.3 50% Crew: 2459.2 75% Crew: 2740.1 100% Crew: 3021 100% Crew Rammer: 3296.6 Vents: 3079.3 Both: 3360.2 Both and BiA: 3423.8 Both and Max Crew %: 3545.7 See here, here, or here for more information. | |}} | |}} 2000.7 ▲ Standard Gun Using Shell Type 1 (390 Damage): Theoretical Damage Per Minute Nominal DPM: 2000.7 50% Crew: 1614.6 75% Crew: 1848.6 100% Crew: 2086.5 100% Crew Vents: 2133.3 Rammer: 2316.6 Both: 2371.2 Both and BiA: 2421.9 Both and Max Crew %: 2527.2 Advantageous Damage Per Minute First-shot DPM: 2390.7 50% Crew: 2004.6 75% Crew: 2238.6 100% Crew: 2476.5 100% Crew Rammer: 2706.6 Vents: 2523.3 Both: 2761.2 Both and BiA: 2811.9 Both and Max Crew %: 2917.2 See here, here, or here for more information. ▼ Standard Gun Using Shell Type 2 (390 Damage): Theoretical Damage Per Minute Nominal DPM: 2000.7 50% Crew: 1614.6 75% Crew: 1848.6 100% Crew: 2086.5 100% Crew Vents: 2133.3 Rammer: 2316.6 Both: 2371.2 Both and BiA: 2421.9 Both and Max Crew %: 2527.2 Advantageous Damage Per Minute First-shot DPM: 2390.7 50% Crew: 2004.6 75% Crew: 2238.6 100% Crew: 2476.5 100% Crew Rammer: 2706.6 Vents: 2523.3 Both: 2761.2 Both and BiA: 2811.9 Both and Max Crew %: 2917.2 See here, here, or here for more information. ▲ Standard Gun Using Shell Type 3 (530 Damage): With wholly penetrating hits Theoretical Damage Per Minute Nominal DPM: 2718.9 50% Crew: 2194.2 75% Crew: 2512.2 100% Crew: 2835.5 100% Crew Vents: 2899.1 Rammer: 3148.2 Both: 3222.4 Both and BiA: 3291.3 Both and Max Crew %: 3434.4 Advantageous Damage Per Minute First-shot DPM: 3248.9 50% Crew: 2724.2 75% Crew: 3042.2 100% Crew: 3365.5 100% Crew Rammer: 3678.2 Vents: 3429.1 Both: 3752.4 Both and BiA: 3821.3 Both and Max Crew %: 3964.4 See here, here, or here for more information. Damage Per Minute

| |}} 0.45 m  ▲ With 50% Crew: 0.557 m With 75% Crew: 0.487 m With 100% Crew: 0.431 m With BiA: 0.422 m With BiA and Vents: 0.413 m Maximum possible: 0.396 m For more details, see Crew | |}} 0.42 m  ▲ With 50% Crew: 0.52 m With 75% Crew: 0.454 m With 100% Crew: 0.403 m With BiA: 0.394 m With BiA and Vents: 0.385 m Maximum possible: 0.369 m For more details, see Crew Accuracy

| |}} 3.4 s  ▲ With 50% Crew: 4.212 s With 75% Crew: 3.678 s With 100% Crew: 3.26 s With GLD: 2.964 s With BiA: 3.188 s With BiA and Vents: 3.119 s With both and GLD: 2.835 s Maximum possible: 2.718 s For more details, see Crew or Equipment | |}} 3 s  ▲ With 50% Crew: 3.716 s With 75% Crew: 3.245 s With 100% Crew: 2.877 s With GLD: 2.615 s With BiA: 2.813 s With BiA and Vents: 2.752 s With both and GLD: 2.502 s Maximum possible: 2.398 s For more details, see Crew or Equipment Aim time

3032 deg/s Turret Traverse

360° Gun Arc

-5°/+20°-5°/+20° Elevation Arc

3030 rounds Ammo Capacity

General

1515 % Chance of Fire

340 m  ▲ With 50% Crew: 267.1 m With 75% Crew: 303.6 m With 100% Crew: 340 m With Recon and Situational Awareness: 357.2 m With Coated Optics: 374 m With Binocular Telescope: 425 m Maximum possible: 486.7 m For more details, see Skills or Equipment 350 m  ▲ With 50% Crew: 275 m With 75% Crew: 312.5 m With 100% Crew: 350 m With Recon and Situational Awareness: 367.7 m With Coated Optics: 385 m With Binocular Telescope: 437.5 m Maximum possible: 501.1 m For more details, see Skills or Equipment View Range

| |}} 440 m  ▲ With 50% Crew: 345.7 m With 75% Crew: 392.9 m With 100% Crew: 440 m With 100% Signal Boost: 528 m When affected by 100% Relaying: 484 m Maximum possible: 633.1 m For more details, see Skills or Equipment | |}} 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 TopValues are Top - click for Stock

IS

IS-M

Object 705

VIII

2550000

The IS-M is a Soviet tier 8 heavy tank.

The IS-2Sh (IS-M) was a project for the significant modification of the IS-2 proposed by N. F. Shashmurin at Kirov Factory No. 100 in early 1944. The design featured a long-barrel 122 mm gun and a rear placement of the fighting compartment. The project was discontinued in favor of the IS-6 (Object 252).

The IS-M leads to the Object 705.

Modules / Available Equipment and Consumables

Modules

Guns

Tier	Gun	Penetration (mm)	Damage (HP)	Rate of fire (rounds/minute)	Dispersion (m/100m)	Aiming time (s)		Weight (kg)	Price ()
VIII	122 mm D-25T	175/217/61	390/390/530	4.51	0.44	3.4		2590	125140
IX	122 mm D-25BM	212/240/68	390/390/530	5.13	0.42	3		2800	144000

Engines

Tier	Engine	Engine Power (hp)	Chance of Fire on Impact (%)		Weight (kg)	Price ()
VIII	M-40 650	650	15		1250	45000
IX	M-40 750	750	15		1250	78000

Suspensions

Tier	Suspension	Load Limit (т)	Traverse Speed (gr/sec)	Rmin		Weight (kg)	Price ()
VII	IS-M	56	24	B/2		11000	18000
VIII	IS-BM	60	26	B/2		11000	32500

Radios

Tier	Radio	Signal Range (m)		Weight (kg)	Price ()
VII	10RK	440		100	18600
IX	12RT	625		110	33600

Compatible Equipment

                     

Compatible Consumables

                        

Player Opinion

Pros and Cons

Pros:

• Good top gun - high alpha damage and good DPM, handling and aimtime for its caliber
• Very strong upgraded turret with almost no weakspots
• Good at sidescraping
• Surprisingly cheap to research, exp-wise, for a Tier VIII tank

Cons:

• Poor mobility, even when upgraded
• Poor viewrange
• Limited gun depression
• Terrible when stock - poor turret armor and inadequate penetration
• Questionable performance in tier 10 games due to top gun being very inadequate

Performance

The key to playing good in this tank is sidescraping whenever possible (at least against enemies up to tier VIII), and this tank can do it pretty well if handled properly. If you do not overangle and do not expose your weak lower plate, the only thing that should be able to touch you are HE shells. Turret has a weakspot in the form of commander cupola, but it is fairly small and hard to hit from a distance or when moving. However, frontal hull armor is no match for gold shells from tiers IX and X, so note that even sidescraping will not help you much - you will be easily penetrated in upper plate most of the time.

Mobility is a double-edged sword; straight-line driving is actually good, but traverse is horrible - IS-M turns like a boat and is very easily flanked. Never go alone anywhere in this tank.

Bad gun depression means that you cannot take hulldown positions easily, and you are better off avoiding hills and even slight bumps alltogether. Play in cities or behind cover on straight ground.

Penetration is OK for enemies up to tier VIII (mostly; good luck with VK 100.01P, or even another IS-M when sidescraping, for example), and completely inadequate for frontal engagements against other heavies. Pick softer targets if opportunities present themselves. Your good alpha damage and DPM will help in that regard as well.

Overall, stick to other heavies and sidescrape on city maps. On open maps, play as a 2nd line support for your higher tier heavies. When top tier, armor can withstand a lot if angled, but is otherwise easily penetrated by nearly anyone, especially with premium ammo.

As a sidenote, when stock, this tank performs horribly in all aspects (horrible pen and mobility, no armor whatsoever, complemented with very low view range and almost no camo) and it is highly recommended to use free exp to unlock as many modules as possible.

Early Research

• Research the upgraded gun for much needed penetration boost and to unlock the top turret
• Research the top turret, since stock turret has downright laughable armor
• Research the 2nd engine
• Tracks are not required for other modules, so you can research them last

Suggested Equipment

   

Gallery

Historical Info

The IS project started as an improvement over previous KV designs, combining the hull developed for the KV-13 prototypes with the new KV-85 three-man turret. The 85mm gun of the IS-1, however, meant that the T-34/85 sporting the same gun performed better in almost every aspect, the IS only offering slightly better protection. Therefore, this variant, known as IS-85, was deemed insufficient for a breakthrough role. Demands for a 122 or a 152 mm gun were made (despite the ISU-152 already being accepted into service). Kotin himself proposed the use of the A-19 gun, citing its effectiveness against concrete bunkers and enemy tanks alike. The choice of a new 122 mm (4.8 in) gun was studied by Kotin’s team at Zavod Nr.9. As shown at Kursk, the 122 and 152 mm (5.98 in) guns were better suited to take on on the new German tanks, the Tiger, Panther and Elefant. It was obvious that, aside the 85 mm (3.35 in) gun, more suitable for the next evolution of the T-34, a 122 mm would be most recommended to be fitted on the new heavy tank. The gun was equipped with a muzzle brake, despite protests that it would be too noticeable when firing, and installed in a D-5 gun mount. The resulting construction was named D-2T. The T-shaped muzzle brake failed during tests, and was replaced with a "German style" muzzle brake, similar to those used on 88 and 105 mm guns, after almost fatally injuring Marshall Voroshilov during a test in the presence of the Main Defense Commissariat. Later in the tank's life, it was again replaced with a domestic design. This version, known as IS-122, started the fruition of the IS-2 tank. The effects of the new tank gun were excellent: coupled with a new pointed AP shell, it could penetrate the front of a Panther at 1400 meters, and the front of a Tiger at 1800 meters.

The Shashmurin Project

Nikolai Fedorovich Shashmurin, a well-known tank designer, was busy with a brand new IS tank, an alternative to the IS-2. Really, the only things it shared with the IS-2 were the gun caliber and its breakthrough role. It even looked vastly different. Unofficially named the IS-2Sh (Sh = Shashmurin) or simply Shashmurin’s IS-2, it was a complete redesign of the IS. It featured a rear-mounted turret carrying the 122mm gun, large single roadwheels and heavily sloped frontal hull armor. The engine was placed in the middle of the hull, with the driver at the bow cut of off from the rest of the crew. Only one drawing is known to exist of this design.

Characteristics

The plans for this project were lofty indeed: front armour impenetrable for Panther, Tiger, and Ferdinand guns at any range, side armour impenetrable at over 500 meters, an 800-1000 hp engine to get this massive armoured slab moving at 35 kph. Considering that the projected mass of the heavy tank would be 55 tons, that's not even that unthinkable. The fighting compartment was located in the rear, with an engine compartment in the center. This layout allowed to make a gun with a very long barrel, accelerating the shell to 1000 m/s, without it getting in the way of maneuvers. The transmission could be electric or mechanical. One of Shashmurin's projects was deemed viable, designated IS-2M, and began development. Unfortunately, the resources of the construction bureau tasked with the project were soon consumed by the IS-6. While the requirement for impenetrable front armour seems impossible, the IS-3 managed to pull it off in that same year.

click to read more...

Historical Gallery

• 

  S-2Sh (Sh = Shashmurin)

Sources and External Links

Sources

https://www.tanks-encyclopedia.com/ww2/soviet/soviet_IS-II.php
https://tankarchives.blogspot.com/2013/07/birth-of-is-tanks-part-2-is-122.html

USSR

Heavy Tanks

ko:Tank:R139 IS Mja:Tank:R139 IS M