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| − | {{Writing|DonutWMustache}}
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| − | {{Specs-Card
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| − | |code=ussr_bm_31_12
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| − | |images={{GarageImage_{{PAGENAME}}.jpg}}
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| − | }}
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| − | == 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.'' -->
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| − | The '''{{Specs|name}}''' is a premium gift rank {{Specs|rank}} Soviet tank destroyer {{Battle-rating}} also known as "Andryusha". It was introduced during May 2023 as part of the [[wt:en/news/4687-vday-bm-13n-say-hello-from-katyusha-en|2023 Legends 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 300 m in front of the truck when moving on a flat surface.
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| − | == General info==
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| − | === 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 armor. Being a simple truck, even rifle-calibre machine gun 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''
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| − | 4 mm (38°) ''Driver's windows''
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| − | |1 mm (1-8°) ''Doors''
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| − | 4 mm (1-8°) ''Windows''
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| − | |1 mm (1-8°) ''Cabin''
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| − | 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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| − | |}'''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}} <!-- ''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= 134|rbMinHp= 84|AoAweight=}}
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| − | Being a wheeled vehicle with a rather high ground pressure, the BM-31-12 has issues traversing soft and uneven terrain (sand, snow, mud, hills), as expected from a truck. On hard terrain (roads, concrete, etc.), it can reach 72 km/h but the acceleration to get to those speeds is poor. The brakes are not powerful so you'll have to anticipate the braking phases to stop in time. The turn radius is also quite large: you won't be able to change directions easily
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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}} <!-- ''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|M13}}
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| − |
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| − | {| class="wikitable" width="100%" style="text-align:center"
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| − | |-
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| − | ! colspan="5" |300 mm M31-UK rockets|| 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" |N/A||6.2||8.5||10.4||11.5||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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| − | ==== Ammunition====
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| − | {{:M13/Ammunition|1=M-31-UK}}
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| − | ====[[Ammo racks]]====
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| − | [[File:Ammoracks BM-31-12.png|thumb|Ammo racks and firing order of BM-31-12]]<!-- '''Last updated:''' -->
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| − | {| class="wikitable" style="text-align:center"
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| − | |-
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| − | !Full
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| − | ammo
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| − | !Visual
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| − | 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. See attached image.
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| − | == Usage in 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 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'''
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| − | 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 firing the M-31-UK rocket have a very loud launch noise, and will alert enemies all around to your presence.
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| − | There is little the Andryusha can do against enemy aircraft, which can kill 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. Its always recommended to have friendly cover while playing this vehicle.
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| − | '''Ambusher'''
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| − | Best used in an urban or dense maps, where enemies usually will rush down a path or corridor quickly without checking all of their sorroundings. 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 kill 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===<!-- ''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
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| − | *Adjustable suspension
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| − | *Can be used in deceptions: a similar model is used as a static decoration on some maps, with a different launcher and with the armor 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]]
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| − | *Launcher sight helps with aiming to play as an indirect fire weapon
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| − |
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| − | '''Cons:'''
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| − | *Very poor survivability
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| − | *Has issues traversing rough and muddy terrains, to be expected from a wheeled vehicle
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| − | *Poor horizontal launcher traverse
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| − | *Low ammunition supply of 12 rockets
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| − | *Loud and distinguishable firing sound
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| − | *Lacks other armaments beside rockets
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| − | *Large dead zone in front of vehicle up to 250 m (launcher depression of +10°)
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| − | *Vehicle cannot move properly while suspension is adjusted
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| − | *In RB & SB, cannot reload unless on allied capture point and can only reload one rocket at a time; can sometimes take around 2 minutes to completely reload its rockets
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| − | == 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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| − | ''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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| − | == Media==<!-- ''Excellent additions to the article would be video guides, screenshots from the game, and photos.'' -->
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| − | ''Excellent additions to the article would be video guides, screenshots from the game, and photos.''
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| − | == See also==<!-- ''Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example:''
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| − | * ''reference to the series of the vehicles;''
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| − | * ''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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| − |
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| − | == External links==<!-- ''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}} {{USSR premium ground vehicles}}
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