Difference between revisions of "BM-31-12"

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{{Specs-Card
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|code=ussr_bm_31_12
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|images={{Specs-Card-Image|GarageImage_{{PAGENAME}}.jpg|ArtImage_{{PAGENAME}}.png|ArtImage2_{{PAGENAME}}.png}}
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}}
  
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== Description ==
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<!-- ''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.'' -->
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The '''{{Specs|name}}''', also known as "Andryusha", is a premium gift rank {{Specs|rank}} Soviet tank destroyer {{Battle-rating}}. It was introduced in [[Update "Sky Guardians"]] as a reward for the [[wt:en/news/8227-event-legend-of-victory-bm-31-12-andryusha-en|2023 Legend of Victory event]]. A highly unusual vehicle, reminiscent of its smaller brother, the [[BM-13N]]. Not only is its truck-based configuration not the most common, but it also uses 12 x 300 mm M-31-UK rockets as its main armament, has limited traverse, has only 2 crew members, and a gun depression of +8°. The last is somewhat compensated by its ability to lean forwards with a [[Hydropneumatic suspension|hydropneumatic suspension system]] usually found on higher rank vehicles. Its gameplay is best compared with its smaller sibling, the [[BM-13N|BM-13N "Katyusha"]].
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The Andryusha is an artillery piece, belonging more in an artillery formation than in a tank battle. One should stay at a distance from the enemies since its rockets have a blind zone of about 800 m in front of the truck when moving on a flat surface.
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 +
== General info ==
 +
=== Survivability and armour ===
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{{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.'' -->
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Being designed for rear-line support, the  BM-31-12 lacks any real armour. Being a simple truck, even rifle-calibre machine guns can penetrate the vehicle and knock out the two crew members. Therefore, the vehicle is extremely vulnerable to overpressure (HE shells, rockets, bombs, and artillery strikes) as well as strafing aircraft and tank coaxial/roof machine guns. It is best to play at a distance from the frontline and with some cover nearby to retreat behind once the enemy presence increases, as your mobility isn't great either.
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'''Armour type:'''
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*Rolled homogeneous armour (Roof and window covers)
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*Structural steel (Chassis and driver's cabin)
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*Gun Steel (Rocket launcher)
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{| class="wikitable"
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|-
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!Armour!!Front (Slope angle)!!Sides!!Rear!!Roof
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|-
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|Chassis||30 mm||30 mm||30 mm||5 mm
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|-
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|Cabin||1 mm (77-86°) ''Hood''<br>4 mm (38°) ''Driver's windows''
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|1 mm (1-8°) ''Doors''<br>4 mm (1-8°) ''Windows''
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|1 mm (1-8°) ''Cabin''<br>4 mm (86°) ''Rear cover''
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|4 mm
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|-
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|Launcher
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|5 mm (10°)
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|5 mm
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|5 mm (10°)
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|
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|-
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|}
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'''Notes:'''
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*Wheels are 10 mm thick.
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*No armour in front grille, simple 7.62 mm machine gun rounds can enter and damage the engine.
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=== Mobility ===
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{{Specs-Tank-Mobility}}
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<!-- ''Write about the mobility of the ground vehicle. Estimate the specific power and manoeuvrability, as well as the maximum speed forwards and backwards.'' -->
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{{tankMobility|abMinHp=135|rbMinHp=84}}
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=== Modifications and economy ===
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{{Specs-Economy}}
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== Armaments ==
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{{Specs-Tank-Armaments}}
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=== Main armament ===
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{{Specs-Tank-Weapon|1}}
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<!-- ''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.'' -->
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{{main|M-31}}
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{| class="wikitable" style="text-align:center" width="100%"
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|-
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! colspan="5" | [[M-31]] rocket || colspan="5" | Turret rotation speed (°/s) || colspan="4" | Reloading rate (seconds)
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|-
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! Mode !! Capacity !! Vertical !! Horizontal !! Stabilizer
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! Stock !! Upgraded !! Full !! Expert !! Aced
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! Stock !! Full !! Expert !! Aced
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|-
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! ''Arcade''
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| rowspan="2" | 12 || rowspan="2" | +10°/+48° || rowspan="2" | ±10° || rowspan="2" | - || 6.2 || 8.5 || 10.4 || 11.4 || 12.2 || rowspan="2" | 10.40 || rowspan="2" | 9.20 || rowspan="2" | 8.48 || rowspan="2" | 8.00
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|-
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! ''Realistic''
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| 4.2 || 4.9 || 6.0 || 6.6 || 7.0
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|-
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|}
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==== Ammunition ====
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{{:M-31/Ammunition|M-13-UK}}
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==== [[Ammo racks]] ====
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[[File:Ammoracks_{{PAGENAME}}.png|right|thumb|x250px|[[Ammo racks]] of the {{PAGENAME}}]]
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<!-- '''Last updated:''' -->
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{| class="wikitable" style="text-align:center"
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|-
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! Full<br>ammo
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! Visual<br>discrepancy
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|-
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| '''12''' || No
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|-
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|}
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'''Notes''':
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* Rockets deplete inwards, starting from the outside-left rocket on the top row. Rockets then deplete outwards, starting with the inner left rocket on the bottom row.
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{{Clear}}
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== Usage in battles ==
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<!-- ''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).'' -->
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There are two main ways to use the Andryusha, which are very similar in playstyle to its smaller sibling, the [[BM-13N|Katyusha]]
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'''Artillery'''
 +
 +
Usage of this vehicle in its intended role of rear-line support and artillery strike. One should estimate the correct angle, shoot a rocket, watch where it lands, adjust fire, and retry it as needed. Do not take too much time with this method of rangefinding since a single retaliatory shot can end your day. Once the correct sight distance is found, unleash hell on your enemies, blinding them with dust lifting up from the ground, detonating ammo racks and blasting off tracks. This is basically an intelligent artillery barrage. Once all rockets are fired, fall back behind allied lines, find a captured objective to reload at, and repeat. Keep in mind that the M-31-UK rockets have a very loud launch noise, and will alert enemies all around to your presence.
 +
 +
There is little the Andryusha can do against enemy aircraft, which can destroy the vehicle with as little as a half-second machine gun burst or a relatively close detonation of a bomb or rocket. Try not to get caught out in the open, and try to hide behind obstacles. It's always recommended to have friendly cover while playing this vehicle.
 +
 +
'''Ambusher'''
 +
 +
Best used in urban or dense maps, where enemies will usually rush down a path or corridor quickly without checking all of their surroundings. Find yourself a pile of rubble or other kind of short cover and lower the front suspension of the truck in such a way that you can fire right in front of you just past the obstacle. When an enemy passes by, simply hit it with a rocket. This tactic is often a last resort when you're cornered and encircled. You may destroy one or more enemies if you're lucky, but you will eventually be caught or your rockets will run out.
 +
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=== Pros and cons ===
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<!-- ''Summarise and briefly evaluate the vehicle in terms of its characteristics and combat effectiveness. Mark its pros and cons in a bulleted list. Try not to use more than 6 points for each of the characteristics. Avoid using categorical definitions such as "bad", "good" and the like - use substitutions with softer forms such as "inadequate" and "effective".'' -->
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'''Pros:'''
 +
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*Very powerful 300 mm rockets with a high explosive mass. Able to take out almost all vehicles in a single direct hit
 +
*Adjustable suspension
 +
*Can be used in deceptions: a similar model is used as a static decoration on some maps, with a different launcher and with the armour plates lifted. This may allow the player to hide in plain sight. Works better when in groups of 2 Andryushas or more, and especially if someone in your squad has the [[BM-13N|Katyusha]]
 +
 +
'''Cons:'''
 +
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*Very poor survivability
 +
*Has issues traversing rough and muddy terrains, to be expected from a wheeled vehicle
 +
*Poor horizontal launcher traverse
 +
*Low ammunition supply of 12 rockets
 +
*Loud and distinguishable firing sound
 +
*Lacks other armaments beside rockets
 +
*Large dead zone in front of vehicle, up to 800 m on level terrain (launcher depression of +10°)
 +
*Vehicle cannot move properly while suspension is adjusted
 +
 +
== History ==
 +
<!-- ''Describe the history of the creation and combat usage of the vehicle in more detail than in the introduction. If the historical reference turns out to be too long, take it to a separate article, taking a link to the article about the vehicle and adding a block "/History" (example: <nowiki>https://wiki.warthunder.com/(Vehicle-name)/History</nowiki>) and add a link to it here using the <code>main</code> template. Be sure to reference text and sources by using <code><nowiki><ref></ref></nowiki></code>, as well as adding them at the end of the article with <code><nowiki><references /></nowiki></code>. This section may also include the vehicle's dev blog entry (if applicable) and the in-game encyclopedia description (under <code><nowiki>=== In-game description ===</nowiki></code>, also if applicable).'' -->
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Unguided 300 mm M-30 rockets were used by the Red Army since 1942 as a field artillery, being fired from metal frames right in the transporting containers. Soon, an upgraded version of the rocket appeared under the designation M-31 with an improved engine and a significantly increased range. Engineers from the special design bureau of the Moscow Kompressor plant designed a combat vehicle on the chassis of the US-built Studebaker US6 three-axle truck with a framework of 12 welded rails to launch these powerful rockets. The machine was successfully tested in the spring of 1944 and was put into service in June under the designation BM-31-12. In the troops, by analogy with the Katyusha MLRS, the new vehicle was nicknamed Andryusha (“little Andrey” in Russian).
 +
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Rocket launchers Andryusha were widely used in the battles of the final stages of WWII in Europe, including the urban battles as a fire support for Soviet storming troops. In total, the Red Army received 1,807 BM-31-12 Andryusha vehicles until the end of the war.
 +
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- From ''[[wt:en/news/8222-development-bm-31-12-katyusha-s-little-brother-en|Devblog]]''
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== Media ==
 +
<!-- ''Excellent additions to the article would be video guides, screenshots from the game, and photos.'' -->
 +
''Excellent additions to the article would be video guides, screenshots from the game, and photos.''
 +
 +
== See also ==
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<!-- ''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.'' -->
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;Other vehicles of similar configuration and role
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*[[BM-13N]]
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*[[BM-8-24]]
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== External links ==
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<!-- ''Paste links to sources and external resources, such as:''
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* ''topic on the official game forum;''
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* ''other literature.'' -->
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*[[wt:en/news/8227-event-legend-of-victory-bm-31-12-andryusha-en|[Event] Legend of Victory: BM-31-12 "Andryusha"]]
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*[[wt:en/news/8222-development-bm-31-12-katyusha-s-little-brother-en|[Devblog] BM-31-21: Katyusha's Little Brother]]
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{{USSR tank destroyers}}
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{{USSR premium ground vehicles}}
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[[Category:Wheeled ground vehicles]]

Latest revision as of 04:41, 18 June 2023

Introducing Wiki 3.0
BM-31-12
ussr_bm_31_12.png
GarageImage BM-31-12.jpg
ArtImage BM-31-12.png
ArtImage2 BM-31-12.png
BM-31-12
USSR flag.png USSR
III Rank
Battle rating:
AB RB SB
4.0 4.0 4.0
Class:
PREMIUM
Purchase:Bundle or Gift

Description

The BM-31-12, also known as "Andryusha", is a premium gift rank III Soviet tank destroyer with a battle rating of 4.0 (AB/RB/SB). It was introduced in Update "Sky Guardians" as a reward for the 2023 Legend of Victory event. A highly unusual vehicle, reminiscent of its smaller brother, the BM-13N. Not only is its truck-based configuration not the most common, but it also uses 12 x 300 mm M-31-UK rockets as its main armament, has limited traverse, has only 2 crew members, and a gun depression of +8°. The last is somewhat compensated by its ability to lean forwards with a hydropneumatic suspension system usually found on higher rank vehicles. Its gameplay is best compared with its smaller sibling, the BM-13N "Katyusha".

The Andryusha is an artillery piece, belonging more in an artillery formation than in a tank battle. One should stay at a distance from the enemies since its rockets have a blind zone of about 800 m in front of the truck when moving on a flat surface.

General info

Survivability and armour

Armourfront / side / back
Hull4 / 4 / 4
Turret0 / 0 / 0
Crew2 people
Visibility75 %

Being designed for rear-line support, the BM-31-12 lacks any real armour. Being a simple truck, even rifle-calibre machine guns can penetrate the vehicle and knock out the two crew members. Therefore, the vehicle is extremely vulnerable to overpressure (HE shells, rockets, bombs, and artillery strikes) as well as strafing aircraft and tank coaxial/roof machine guns. It is best to play at a distance from the frontline and with some cover nearby to retreat behind once the enemy presence increases, as your mobility isn't great either.

Armour type:

  • Rolled homogeneous armour (Roof and window covers)
  • Structural steel (Chassis and driver's cabin)
  • Gun Steel (Rocket launcher)
Armour Front (Slope angle) Sides Rear Roof
Chassis 30 mm 30 mm 30 mm 5 mm
Cabin 1 mm (77-86°) Hood
4 mm (38°) Driver's windows 		1 mm (1-8°) Doors
4 mm (1-8°) Windows 		1 mm (1-8°) Cabin
4 mm (86°) Rear cover 		4 mm
Launcher 5 mm (10°) 5 mm 5 mm (10°)

Notes:

  • Wheels are 10 mm thick.
  • No armour in front grille, simple 7.62 mm machine gun rounds can enter and damage the engine.

Mobility

 
Controlled suspension
It is possible to adjust the ground clearance or more complex suspension positions
Speedforward / back
AB79 / 11 km/h
RB and SB73 / 10 km/h
Number of gears5 forward
1 back
Weight6.4 t
Engine power
AB181 hp
RB and SB95 hp
Power-to-weight ratio
AB28.3 hp/t
RB and SB14.8 hp/t
Game Mode Max Speed (km/h) Weight (tons) Engine power (horsepower) Power-to-weight ratio (hp/ton)
Forward Reverse Stock Upgraded Stock Upgraded
Arcade 79 11 6.4 135 181 21.09 28.28
Realistic 73 10 84 95 13.13 14.84

Modifications and economy

Repair cost
AB1 761 Sl icon.png
RB2 092 Sl icon.png
SB1 524 Sl icon.png
Crew training10 000 Sl icon.png
Experts67 000 Sl icon.png
Aces330 Ge icon.png
Research Aces570 000 Rp icon.png
Reward for battleAB / RB / SB
Talisman.png 2 × 90 / 140 / 150 % Sl icon.png
Talisman.png 2 × 136 / 136 / 136 % Rp icon.png
Modifications
Mobility Protection Firepower
Mods new wheels.png
Tires
Mods new car suspension.png
Suspension
Mods new tank break.png
Brake System
Mods new tank filter.png
Filters
Mods new tank transmission.png
Transmission
Mods new tank engine.png
Engine
Mods tank tool kit.png
Improved Parts
Mods extinguisher.png
Improved FPE
Mods tank reinforcement ussr.png
Crew Replenishment
Mods new tank horizontal aiming.png
Horizontal Drive
Mods new tank vertical aiming.png
Elevation Mechanism
Mods art support.png
Artillery Support

Armaments

Main armament

300 mm M-31 rocket
Ammunition12 rounds
Reloadbasic crew → aces
10.4 → 8.0 s
Vertical guidance10° / 48°
Horizontal guidance-10° / 10°
Flight speed245 m/s
Range4 000 m
Main article: M-31
M-31 rocket Turret rotation speed (°/s) Reloading rate (seconds)
Mode Capacity Vertical Horizontal Stabilizer Stock Upgraded Full Expert Aced Stock Full Expert Aced
Arcade 12 +10°/+48° ±10° - 6.2 8.5 10.4 11.4 12.2 10.40 9.20 8.48 8.00
Realistic 4.2 4.9 6.0 6.6 7.0

Ammunition

Penetration statistics
Ammunition Type of
warhead 		Penetration @ 0° Angle of Attack (mm)
10 m 100 m 500 m 1,000 m 1,500 m 2,000 m
M-31-UK Rocket 66 66 66 66 66 66
Shell details
Ammunition Type of
warhead 		Velocity
(m/s) 		Projectile
mass (kg) 		Fuse delay
(m) 		Fuse sensitivity
(mm) 		Explosive mass
(TNT equivalent) (kg) 		Ricochet
0% 50% 100%
M-31-UK Rocket 245 91.5 0 0.1 28.9 79° 80° 81°

Ammo racks

Ammo racks of the BM-31-12
Full
ammo 		Visual
discrepancy
12 No

Notes:

  • Rockets deplete inwards, starting from the outside-left rocket on the top row. Rockets then deplete outwards, starting with the inner left rocket on the bottom row.

Usage in battles

There are two main ways to use the Andryusha, which are very similar in playstyle to its smaller sibling, the Katyusha

Artillery

Usage of this vehicle in its intended role of rear-line support and artillery strike. One should estimate the correct angle, shoot a rocket, watch where it lands, adjust fire, and retry it as needed. Do not take too much time with this method of rangefinding since a single retaliatory shot can end your day. Once the correct sight distance is found, unleash hell on your enemies, blinding them with dust lifting up from the ground, detonating ammo racks and blasting off tracks. This is basically an intelligent artillery barrage. Once all rockets are fired, fall back behind allied lines, find a captured objective to reload at, and repeat. Keep in mind that the M-31-UK rockets have a very loud launch noise, and will alert enemies all around to your presence.

There is little the Andryusha can do against enemy aircraft, which can destroy the vehicle with as little as a half-second machine gun burst or a relatively close detonation of a bomb or rocket. Try not to get caught out in the open, and try to hide behind obstacles. It's always recommended to have friendly cover while playing this vehicle.

Ambusher

Best used in urban or dense maps, where enemies will usually rush down a path or corridor quickly without checking all of their surroundings. Find yourself a pile of rubble or other kind of short cover and lower the front suspension of the truck in such a way that you can fire right in front of you just past the obstacle. When an enemy passes by, simply hit it with a rocket. This tactic is often a last resort when you're cornered and encircled. You may destroy one or more enemies if you're lucky, but you will eventually be caught or your rockets will run out.

Pros and cons

Pros:

  • Very powerful 300 mm rockets with a high explosive mass. Able to take out almost all vehicles in a single direct hit
  • Adjustable suspension
  • Can be used in deceptions: a similar model is used as a static decoration on some maps, with a different launcher and with the armour plates lifted. This may allow the player to hide in plain sight. Works better when in groups of 2 Andryushas or more, and especially if someone in your squad has the Katyusha

Cons:

  • Very poor survivability
  • Has issues traversing rough and muddy terrains, to be expected from a wheeled vehicle
  • Poor horizontal launcher traverse
  • Low ammunition supply of 12 rockets
  • Loud and distinguishable firing sound
  • Lacks other armaments beside rockets
  • Large dead zone in front of vehicle, up to 800 m on level terrain (launcher depression of +10°)
  • Vehicle cannot move properly while suspension is adjusted

History

Unguided 300 mm M-30 rockets were used by the Red Army since 1942 as a field artillery, being fired from metal frames right in the transporting containers. Soon, an upgraded version of the rocket appeared under the designation M-31 with an improved engine and a significantly increased range. Engineers from the special design bureau of the Moscow Kompressor plant designed a combat vehicle on the chassis of the US-built Studebaker US6 three-axle truck with a framework of 12 welded rails to launch these powerful rockets. The machine was successfully tested in the spring of 1944 and was put into service in June under the designation BM-31-12. In the troops, by analogy with the Katyusha MLRS, the new vehicle was nicknamed Andryusha (“little Andrey” in Russian).

Rocket launchers Andryusha were widely used in the battles of the final stages of WWII in Europe, including the urban battles as a fire support for Soviet storming troops. In total, the Red Army received 1,807 BM-31-12 Andryusha vehicles until the end of the war.

- From Devblog

Media

Excellent additions to the article would be video guides, screenshots from the game, and photos.

See also

Other vehicles of similar configuration and role

External links


USSR tank destroyers
SU-76M  SU-76M · SU-76M (5th Gv.Kav.Corps) · SU-85A
SU-57B  SU-57B · SU-76D
T-34 Derivatives  SU-122 · SU-85 · SU-85M · SU-100 · SU-122P
Heavy Tank Derivatives  SU-100Y · ISU-122 · ISU-122S · SU-152 · ISU-152 · Object 268
SU-100P and Derivatives  SU-100P · Object 120
Wheeled  YaG-10 (29-K)
Airborne  ASU-57 · ASU-85
Rocket  BM-8-24 · BM-13N · BM-31-12
ATGM  IT-1 · Shturm-S · Object 775 · Khrizantema-S
Artillery  2S1 · 2S3M
Other  SU-5-1 · ZiS-30 · SU-122-54
USA  SU-57

USSR premium ground vehicles
Light tanks  BA-11 · RBT-5 · BT-7A (F-32) · T-26 (1st Gv.T.Br.) · T-26E · T-126 · PT-76-57 · 2S38
Medium tanks  T-34 (Prototype) · T-34 (1st Gv.T.Br.) · T-34E · T-34-57 (1943) · T-34-85E · T-34-100 · T-44-122 · TO-55 · T-55AM-1 · T-72AV (TURMS-T) · T-80UD · Т-80U-Е1
  ▂M3 Medium · ▂M4A2 · ▂T-III · ▂T-V · ▂МК-IX "Valentine"
Heavy tanks  SMK · T-35 · ▂MK-II "Matilda" · KV-1E · KV-2 (1940) · KV-2 (ZiS-6) · KV-122 · KV-220 · IS-2 "Revenge" · Object 248 · IS-6 · T-10A
Tank destroyers  BM-8-24 · BM-13N · BM-31-12
  SU-57 · SU-76D · SU-76M (5th Gv.Kav.Corps) · SU-85A · SU-100Y · SU-122P · Object 120
SPAA  ▂Phòng không T-34 · ZUT-37

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