Difference between revisions of "Strv m/31"

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{{Specs-Card|code=sw_strv_m31}}
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{{Specs-Card
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|code=sw_strv_m31
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|images={{Specs-Card-Image|GarageImage_Strv_m31.jpg|ArtImage_Strv_m-31.png}}
 +
}}
  
 
== Description ==
 
== 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.'' -->
 
<!-- ''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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[[File:GarageImage_Strv_m31.jpg|420px|thumb|left]]
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The '''{{Specs|name}}''', also known as '''Landsverk L-10''', was designed and built by AB Landsverk during the interwar period. For its time it was quite revolutionary, and it was considered a medium tank. It was the first tank to ever be produced with an all-welded design, and it used periscopes for increased visibility, instead of the traditional view ports. It mounted a very common armament for the time, a 37 mm L45 Bofors anti-tank gun and two license-produced Browning M1917 MGs. While the tank did serve with Sweden, only three were ever built, and the last one has been conserved at the Swedish Tank Museum Arsenalen.
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{{Break}}
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−
The '''{{Specs|name}}''' is a rank {{Specs|rank}} Swedish light tank {{Battle-rating}}. It was introduced in [[Update 1.97 "Viking Fury"]].
+
Introduced in [[Update 1.97 "Viking Fury"]], the Strv m/31 is a very light tank, with good mobility. Its armour is in fact so thin, that it can't stop 12.7 mm HMG fire in some places, especially in the sides and back of the tank. However, the tank is extremely well armed, it features the slpprj m/49 APDS shell, a very good shell for its rank, and even in uptiers it would remain competitive, since its mobility and armament are capable of dealing with higher BR enemies like the [[B1 ter]] and the [[Valentine (Family)|Valentine]]. The tank also has access to an APHE shell, but lacks enough armour penetration to be useful even against reserve tanks.
  
 
== General info ==
 
== General info ==
 
=== Survivability and armour ===
 
=== Survivability and armour ===
 +
{{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.'' -->
 
<!-- ''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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{| class="wikitable"
+
The armour of the Strv m/31 is thin and should not be relied on. The frontal hull armour tops at 24 mm and is poorly angled, meaning that almost any tank can penetrate it (e.g. [[BT-5]], [[M2]], [[Pz.II (Disambiguation)|Pz.II]]), even the .50 cal! The hull side is 24 mm thick which can also be penetrated with ease, but sometimes if the enemy messes up their aim, an angled 24 mm side may bounce one or two shots.
−
!Armour
+
 
−
!Front (Slope angle)
+
The turret front is weak against high-penetrating tanks like [[M3 GMC]] and [[Panzerjager I]], as it is still 24 mm thick and not angled. Against weaker small-calibre rounds it may be effective to some extent. The gun mantlet is full of 'obstacles' like the armoured housings for the coaxial MG, the cannon barrels and its hydraulic recoil cylinders which, with the implementation of volumetric shells, became fairly good at catching shells and making them lose penetration. Thus the parts where shells can actually go through without being interfered are very small and hard to target. Other than the gun mantlet, the rest of the turret, when viewed from the front, is composed of extreme angles, which will certainly ricochet any shells. When shot from other directions than the front, the turret is still poorly armoured and is not very likely to stop any shells.
−
!Sides
 
−
!Rear
 
−
!Roof
 
−
|-
 
−
|Hull
 
−
|14 mm (59'''°''') ''Upper Glacis''
 
−
24 mm (31'''°''') ''Lower Glacis''
 
  
−
24 mm (1'''°''') ''Machine Gun Port and Upper Hull Front''
+
The post-penetration survivability is very low since the 3 crew members are seated closely to each other. An explosive-packed shot would usually knock all of them out. Even a solid shot/autocannon shells might easily knock out 2 crew members, destroying the tank.
  
−
14 mm (35'''°'''-46'''°''') ''Driver's Hatch''
+
The one positive side is, perhaps, that the transmission is not located near the front, so the Strv m/31 will not be immobilized if it gets frontally penetrated.
  
−
14 mm (39'''°''') ''Machine Gunner's Hatch''
+
{| class="wikitable"
−
|24 mm
+
|-
−
|8 mm ''Upper''
+
! Armour !! Front (Slope angle) !! Sides !! Rear !! Roof
−
20 mm ''Lower''
+
|-
−
|8 mm ''Front and Rear''
+
| Hull || 14 mm (59°) ''Upper Glacis'' <br> 24 mm (31°) ''Lower Glacis'' <br> 24 mm (1°) ''Machine Gun Port and Upper Hull Front'' <br> 14 mm (35°-46°) ''Driver's Hatch'' <br> 14 mm (39°) ''Machine Gunner's Hatch'' || 24 mm || 8 mm ''Upper'' <br> 20 mm ''Lower'' || 8 mm ''Front and Rear'' <br> 5 mm ''Middle''
−
5 mm ''Middle''
 
 
|-
 
|-
−
|Turret
+
| Turret || 24 mm (14°-15°) ''Turret front'' <br> 24 mm (1°) ''Gun mantlet'' || 24 mm || 24 mm || 8 mm
−
|24 mm (14'''°'''-15°) ''Turret front''
 
−
24 mm (1'''°''') ''Gun mantlet''
 
−
|24 mm
 
−
|24 mm
 
−
|8 mm
 
 
|}
 
|}
 +
 +
'''Notes:'''
 +
 +
* Suspension wheels, tracks and torsion bars are 15 mm thick.
  
 
=== Mobility ===
 
=== Mobility ===
 +
{{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.'' -->
 
<!-- ''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= 310|rbMinHp= 177}}
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{{tankMobility|abMinHp=232|rbMinHp=133}}
 +
 
 +
The mobility of the Strv m/31 is in the top range. Though not as fast as tanks like BT-5, this tank is still able to lead the charge with its great speed (both on and off road). On average the Strv m/31 can cruise at around 42 km/h, allowing it to get to any location on time. The reverse speed is also great, topping at 19 km/h meaning the player can usually retreat from danger without turning around, increasing survivability. The tank's mobility gives it more agility to conduct short range tactical manoeuvres. The hull traverse is slightly worse, often needing a forward/backward acceleration before turning. Overall, the Strv m/31 is fast and agile.
 +
 
 +
=== Modifications and economy ===
 +
{{Specs-Economy}}
  
 
== Armaments ==
 
== Armaments ==
 +
{{Specs-Tank-Armaments}}
 
=== Main armament ===
 
=== Main armament ===
 +
{{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|kan m/38 (37 mm)}}
 
{{main|kan m/38 (37 mm)}}
  
−
<!-- ''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.'' -->
+
The Strv m/31 is equipped with a 37 mm kan m/38 cannon, a good gun for a tank its rank. The cannon has adequate accuracy, which allows for the engagement of distant targets to some extent. It also has a short reload time of ~3.5 seconds ensuring quick follow-up shots, if the first shell failed to knock out the enemy target. An impressive -10° gun depression means the tank can comfortably fight among hills.
 +
 
 +
The default slpprj m/38 round is very average, with around 50 mm of penetration which is usually enough to penetrate most tanks, such as [[T-26 (Family)|T-26]], [[M3A1 Stuart|M3A1]], [[Chi-Ha (Family)|Chi-Ha]], etc. The post-penetration effect is quite poor, but this is to be expected for a solid APBC shell. The good news is the fast reload, which allows you to quickly pinpoint crew members untouched by earlier shots.
 +
 
 +
The unlockable slpgr m/39 shell comes with a 15g explosive filler which can be very helpful given that most early-war tanks are crammed with a small number of crew members. This will result in the Strv m/31 easily knocking out tanks like [[BT-5]]/[[BT-7 (Family)|7]], [[Pz.II (Disambiguation)|Pz.II]], [[Ke-Ni]] in one shot. One thing to note, is that the slpgr m/39 has slightly worse penetration than the default APBC, so it will struggle against better armoured tanks such as an angling [[M13/40 (Family)|M13/40]].
 +
 
 +
The slpprj m/49 APDS will be a nasty surprise should the m/31 fight in an uptier. This shell has formidable penetration of 105 mm, allowing the m/31 to penetrate tough tanks such as [[B1 bis]]/[[B1 ter|ter]], [[Matilda (Family)|Matilda]], or [[Valentine I|Valentine]]. Its velocity of more than 1,000 m/s is very fast, meaning sniping moving targets is easier. Such velocity leads to a noticeably flattened trajectory, further easing the task of sniping. Just like the default APBC, this shell has poor post-penetration damage, so be sure to aim for critical spots and use your fast reload well.
 +
 
 
{| class="wikitable" style="text-align:center" width="100%"
 
{| class="wikitable" style="text-align:center" width="100%"
 
|-
 
|-
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|-
 
|-
 
! ''Arcade''
 
! ''Arcade''
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| rowspan="2" | 127 || rowspan="2" | -10°/+20° || rowspan="2" | ±180° || rowspan="2" | N/A || 15.20 ||21.08||25.60||28.31||30.12|| rowspan="2" | 4.06 || rowspan="2" |3.57|| rowspan="2" |3.29|| rowspan="2" |3.10
+
| rowspan="2" | 127 || rowspan="2" | -10°/+25° || rowspan="2" | ±180° || rowspan="2" | N/A || 15.2 || 21.1 || 25.6 || 28.3 || 30.1 || rowspan="2" | 4.03 || rowspan="2" | 3.57 || rowspan="2" | 3.29 || rowspan="2" | 3.10
 
|-
 
|-
 
! ''Realistic''
 
! ''Realistic''
−
| 9.50 || 11.20 ||13.60||15.04||16.00
+
| 9.5 || 11.2 || 13.6 || 15.0 || 16.0
 
|-
 
|-
 
|}
 
|}
  
 
==== Ammunition ====
 
==== Ammunition ====
−
{| class="wikitable sortable" style="text-align:center" width="100%"
+
{{:kan m/38 (37 mm)/Ammunition|slpprj m/38, slpgr m/39, 3.7 cm slpprj m/49}}
−
! colspan="8" | Penetration statistics
 
−
|-
 
−
! rowspan="2" data-sort-type="text" | Ammunition
 
−
! rowspan="2" | Type of<br>warhead
 
−
! colspan="6" | '''Penetration @ 0° Angle of Attack (mm)'''
 
−
|-
 
−
! 10 m !! 100 m !! 500 m !! 1,000 m !! 1,500 m !! 2,000 m
 
−
|-
 
−
| 3,7 cm slpprj m/49 || APDS || 105 || 103 || 97 || 89 || 82 || 75
 
−
|-
 
−
| slpgr m/39 || APBC || 55 || 51 || 37 || 26 || 17 || 12
 
−
|-
 
−
| slpprj m/38 || APBC || 59 || 55 || 41 || 28 || 19 || 13
 
−
|-
 
−
|}
 
−
{| class="wikitable sortable" style="text-align:center" width="100%"
 
−
! colspan="10" | Shell details
 
−
|-
 
−
! rowspan="2" data-sort-type="text" | Ammunition
 
−
! rowspan="2" | Type of<br>warhead
 
−
! rowspan="2" | Velocity<br>(m/s)
 
−
! rowspan="2" | Projectile<br>Mass (kg)
 
−
! rowspan="2" | Fuse delay<br>(m)
 
−
! rowspan="2" | Fuse sensitivity<br>(mm)
 
−
! rowspan="2" | Explosive Mass<br>(TNT equivalent) (g)
 
−
! colspan="3" | Ricochet
 
−
|-
 
−
! 0% !! 50% !! 100%
 
−
|-
 
−
| 3,7 cm slpprj m/49 || APDS || 1,150 || 0.71 || N/A || N/A || N/A || 75° || 78° || 80°
 
−
|-
 
−
| slpgr m/39 || APBC || 800 || 0.74 || 1.2 || 9.0 || 15 || 47° || 60° || 65°
 
−
|-
 
−
| slpprj m/38 || APBC || 785 || 0.74 || N/A || N/A || N/A || 47° || 60° || 65°
 
−
|-
 
−
|}
 
  
 
==== [[Ammo racks]] ====
 
==== [[Ammo racks]] ====
−
<!-- [[File:Ammoracks_{{PAGENAME}}.png|right|thumb|x250px|[[Ammo racks]] of the {{PAGENAME}}]] -->
+
[[File:Ammoracks_Strv_m-31.png|right|thumb|x250px|[[Ammo racks]] of the {{PAGENAME}}]]
 +
<!-- '''Last updated: 2.7.0.95''' -->
 
{| class="wikitable" style="text-align:center"
 
{| class="wikitable" style="text-align:center"
 
|-
 
|-
Line 115: Line 91:
 
! 3rd<br>rack empty
 
! 3rd<br>rack empty
 
! 4th<br>rack empty
 
! 4th<br>rack empty
−
! 5th<br>rack empty
 
−
! 6th<br>rack empty
 
 
! Visual<br>discrepancy
 
! Visual<br>discrepancy
 
|-
 
|-
−
| '''127''' || 111&nbsp;''(+16)'' || 67&nbsp;''(+60)'' || 45&nbsp;''(+82)'' || 0&nbsp;''(+127)'' || __&nbsp;''(+__)'' || __&nbsp;''(+__)'' || __
+
| '''127''' || 111&nbsp;''(+16)'' || 67&nbsp;''(+60)'' || 45&nbsp;''(+82)'' || 1&nbsp;''(+126)'' || No
 
|-
 
|-
 
|}
 
|}
 +
'''Notes''':
 +
 +
* As they are modeled by sets of 2, 4 or 5, shells disappear from the rack only after you've fired all shells in the set.
 +
* Turret and left flank empty: 45&nbsp;''(+82)'' shells.
  
 
=== Machine guns ===
 
=== Machine guns ===
 +
{{Specs-Tank-Weapon|2}}
 
<!-- ''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|ksp m/14-29 (6.5 mm)}}
 
{{main|ksp m/14-29 (6.5 mm)}}
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The Strv m/31 is equipped with a 6.5 mm machine gun, nothing out of the ordinary. It is useful for attacking AA vehicles or more lightly armoured foes.
 
The Strv m/31 is equipped with a 6.5 mm machine gun, nothing out of the ordinary. It is useful for attacking AA vehicles or more lightly armoured foes.
  
−
{| class="wikitable" style="text-align:center"
+
{| class="wikitable" style="text-align:center" width="50%"
 
|-
 
|-
 
! colspan="5" | [[ksp m/14-29 (6.5 mm)|6.5 mm ksp m/14-29]]
 
! colspan="5" | [[ksp m/14-29 (6.5 mm)|6.5 mm ksp m/14-29]]
 
|-
 
|-
−
! Mount
+
! Mount !! Capacity (Belt) !! Fire rate !! Vertical !! Horizontal
−
! Capacity<br>(Belt capacity)
 
−
! Rate of fire<br>(shots/minute)
 
−
! Vertical<br>guidance
 
−
! Horizontal<br>guidance
 
 
|-
 
|-
−
| Coaxial || 4,000 (250) || 498 || N/A || N/A
+
| Coaxial || 4,000 (250) || 499 || N/A || N/A
 
|-
 
|-
 
|}
 
|}
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== Usage in battles ==
 
== 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).'' -->
 
<!-- ''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).'' -->
−
The Strv m/31 is a light tank with poor armour. It shouldn't be used to rush into the heat of the battle or you will get knocked out very quickly. Its armour is inadequate, it can't even stop 12.7 mm HMG fire. Instead, it should be used to flank other enemy tanks, using your excellent speed to your advantage. The Strv m/31 has an unconventional armour layout. Its frontal area (eg.upper hull, glacis area) armour is very weak while the rear is really strong. This tank also has pretty good speed in reverse, so you can drive into battle facing backwards using your rear armour and engine to soak up damage.
+
The Strv m/31 is a light tank with poor armour. It shouldn't be used to rush into the heat of the battle or you will get knocked out very quickly. Its armour is inadequate, it can't even stop 12.7 mm HMG fire. Instead, it should be used to flank other enemy tanks, using your excellent speed to your advantage. The Strv m/31 has an unconventional armour layout. Its frontal area (e.g. upper hull, glacis area) armour is very weak while the rear is really strong. This tank also has pretty good speed in reverse, so you can drive into battle facing backwards using your rear armour and engine to soak up damage.
−
 
 
−
=== Modules ===
 
−
{| class="wikitable"
 
−
! Tier
 
−
! colspan="2" | Mobility
 
−
! Protection
 
−
! colspan="3" | Firepower
 
−
|-
 
−
| I
 
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| Tracks
 
−
|
 
−
| Parts
 
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| Horizontal Drive
 
−
|
 
−
|
 
−
|-
 
−
| II
 
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| Suspension
 
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| Brake System
 
−
| FPE
 
−
| Adjustment of Fire
 
−
|
 
−
|
 
−
|-
 
−
| III
 
−
| Filters
 
−
|
 
−
| Crew Replenishment
 
−
| Elevation Mechanism
 
−
|
 
−
|
 
−
|-
 
−
| IV
 
−
| Transmission
 
−
| Engine
 
−
|
 
−
| Artillery Support
 
−
| slpgr m/39
 
−
| 3,7 cm slpprj m/49
 
−
|-
 
−
|}
 
  
 
=== Pros and cons ===
 
=== Pros and cons ===
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* APDS has no explosive filler, multiple shots will be needed to finish off a tank
 
* APDS has no explosive filler, multiple shots will be needed to finish off a tank
−
* Very weak stock shell (low penetration and post-pen damage)
+
* Very weak stock shell (low penetration and post-penetration damage)
−
* Armor is poor, even for a rank one reserve vehicle
+
* Armour is poor, even for a rank one reserve vehicle
 
* Acceleration and top speed is quite poor, will find itself getting outrun by most vehicles.
 
* Acceleration and top speed is quite poor, will find itself getting outrun by most vehicles.
  
 
== History ==
 
== History ==
−
The Strv m/31 was built by AB Landsverk in 1932. The tank was advanced for it's time such as it's use of all welded armor and using periscopes instead of view slits. These features were desirable to the Swedish armed forces and was put into service in 1935. Only 3 were ever built before the German invasion in 1940 making it a very rare tank. It wasn't used for direct tank on tank combat ,despite being highly advanced, but were dug into the ground as static bunkers.
+
<!-- ''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).'' -->
 +
The Strv m/31 was designed during the 1930s as a continuation development of tanks German designer Joseph Vollmer had designed. When the Germans took over AB Landsverk in 1920 they had the idea of a tracked and wheeled armoured vehicle, which during that time was not allowed to be developed under the Treaty of Versailles. From the design and idea Joseph Vollmer had in Berlin, this idea would continue to be developed in Sweden using AB Landsverk. The tank would be designated L-30 by Landsverk and, along with the development of the L-30 which had both wheels and tracks, there was a purely tracked model of the tank which would be designated L-10.
 +
 
 +
AB Landsverk got an order from KAF in Autumn 1931 to build one L-30 and three L-10 for trials after an in-depth analysis of the vehicles where the L-30 and L-10 would get extensive trials. L-10 would be designated Strv m/31 while L-30, which shared the same construction, would be designated Strv fm/31. After many delays, the L-30 was finally ready from the AB Landsverk, but was deemed to be too outdated and all the advanced technology that had been put into it would make it too vulnerable, as in the meantime tracks had become stronger and suspension systems a lot more comfortable in tanks, favouring the L-10 instead.
 +
 
 +
When the L-10 was delivered from the factory, it could showcase the construction with new modern ideas being presented. Instead of the usually riveted armour, the tanks were welded, which improved the survivability since riveted tanks could eject rivets from enemy shell hits and become projectiles in the crew compartment. Along with the new armour, it also used a prism periscope in glass which would improve the view for the driver and not use the slits tanks used which, though they could be closed to protect from enemy fire, in doing so would turn the driver blind which would be inefficient to have.
 +
 
 +
L-10, designated Strv m/31 by the army, had adequate armour for the time with a total of 24 mm at the front. Also like the other tanks during this period, they were equipped with a 37 mm Bofors gun and two machine guns, one in the turret and one in the hull. They were also equipped with radio equipment and a strong 150 hp Maybach engine. However, Strv m/31 would come with a lot of problems, it was considered a good vehicle on terrain but the tracks would break a lot and would have a lot of problems with the transmission.
 +
 
 +
Strv m/31 saw very little use in service and was proposed to be dug down on Gotland as a static defence. They were also proposed as command tanks. The tank will always be an important part of tank history, leading the way for how the tanks would be constructed being the most advanced tank of the time during its early days.
 +
 
 +
=== [[wt:en/news/6589-development-stridsvagn-m-31-en|Devblog]] ===
 +
Swedish tanks aren't very well known even by many enthusiastic historians or fans of military vehicles. However, many of the design and technological solutions conceived by Swedish tank designers were unique and rather practical. Sweden's armoured vehicles are truly fascinating, and the Swedish ground vehicle line in War Thunder will present to you some highly original tanks with one-of-a-kind features and gameplay finer points. We'll start our overview of the Swedish tech tree by looking at the first tank starting the progress of all the Swedish ground vehicles. Meet the reserve Strv m/31 (from "Stridsvagn", Swedish for "tank"), a 1935 light tank. According to some experts, this little tank came close to being the most high-tech tank of its time!
 +
 
 +
In 1930, the Swedish firm Landsverk developed two tank designs – one fully tracked and the other with a wheel/track arrangement – differing in their chassis construction and armour. In the autumn of 1931, the Swedish government ordered four experimental prototypes – one wheel-and-track and the other three fully tracked. The versatile tank could switch from tracks to wheels in an incredible 30 seconds flat and reach speeds of up to 80 km/h in such a configuration! However, the wheels were unable to bear the weight of substantial armour, so it was limited to 14 mm for this modification. The fully tracked version could cope with armour up to 24 mm thick, which is pretty respectable for a pre-war vehicle. Moreover, the designers took a risk by choosing welded armour plating over the more common riveted design, this also had its advantages. Even more interesting is that they set the angle of the frontal armour plate in order to increase the chance of enemy shells ricocheting. Put into service under the designation Strv m/31, the new tank was given the Maybach petrol engine, which was able to provide a power-to-weight ratio of approximately 17-18 horsepower per ton. The tank's armament comprised a 37 mm cannon with 122 rounds. All of the prototypes were put into service, though they required certain improvements. The vehicles' weak point was their unreliable and difficult-to-maintain suspension, as well as the tanks' overreliance on foreign-made components. The tanks were used as training vehicles.
  
 
== Media ==
 
== 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.'' -->
 +
 +
;Skins
 +
 +
* [https://live.warthunder.com/feed/camouflages/?vehicle=sw_strv_m31 Skins and camouflages for the {{PAGENAME}} from live.warthunder.com.]
 +
 +
;Images
 +
<gallery mode="packed" heights="150">
 +
File:Strv m 31 WTWallpaper 01.jpg|
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File:Strv m 31 WTWallpaper 02.jpg|
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;Videos
 
{{Youtube-gallery|CDl68kOR9ig|'''The Shooting Range #191''' - ''Metal Beasts'' section at 00:50 discusses the Strv m/31.}}
 
{{Youtube-gallery|CDl68kOR9ig|'''The Shooting Range #191''' - ''Metal Beasts'' section at 00:50 discusses the Strv m/31.}}
  
 
== See also ==
 
== 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:''
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<!--''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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* ''reference to the series of the vehicles;''
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;Similar role:
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* [[M2A4]]
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* [[Pz.35(t)]]
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* [[T-26 (Family)]]
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* [[A13 (Family)]]
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* [[Ha-Go (Family)]]
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* [[M13/40 (Family)]]
  
 
== External links ==
 
== External links ==
 
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* ''topic on the official game forum;''
 
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* ''other literature.'' -->
  
 
* [[wt:en/news/6589-development-swedish-ground-forces-stridsvagn-m-31-en|[Devblog] Stridsvagn m/31]]
 
* [[wt:en/news/6589-development-swedish-ground-forces-stridsvagn-m-31-en|[Devblog] Stridsvagn m/31]]
  
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{{TankManufacturer AB Landsverk}}
 
{{Sweden light tanks}}
 
{{Sweden light tanks}}

Latest revision as of 11:09, 25 November 2023

Introducing Wiki 3.0
Strv m/31
sw_strv_m31.png
GarageImage Strv m31.jpg
ArtImage Strv m-31.png
Strv m/31
Sweden flag.png Sweden
I Rank
Battle rating:
AB RB SB
1.0 1.0 1.0
Class:
Research:Free
Purchase:Free

Description

The Stridsvagn m/31, also known as Landsverk L-10, was designed and built by AB Landsverk during the interwar period. For its time it was quite revolutionary, and it was considered a medium tank. It was the first tank to ever be produced with an all-welded design, and it used periscopes for increased visibility, instead of the traditional view ports. It mounted a very common armament for the time, a 37 mm L45 Bofors anti-tank gun and two license-produced Browning M1917 MGs. While the tank did serve with Sweden, only three were ever built, and the last one has been conserved at the Swedish Tank Museum Arsenalen.

Introduced in Update 1.97 "Viking Fury", the Strv m/31 is a very light tank, with good mobility. Its armour is in fact so thin, that it can't stop 12.7 mm HMG fire in some places, especially in the sides and back of the tank. However, the tank is extremely well armed, it features the slpprj m/49 APDS shell, a very good shell for its rank, and even in uptiers it would remain competitive, since its mobility and armament are capable of dealing with higher BR enemies like the B1 ter and the Valentine. The tank also has access to an APHE shell, but lacks enough armour penetration to be useful even against reserve tanks.

General info

Survivability and armour

Armourfront / side / back
Hull24 / 24 / 20
Turret24 / 24 / 24
Crew4 people
Visibility76 %

The armour of the Strv m/31 is thin and should not be relied on. The frontal hull armour tops at 24 mm and is poorly angled, meaning that almost any tank can penetrate it (e.g. BT-5, M2, Pz.II), even the .50 cal! The hull side is 24 mm thick which can also be penetrated with ease, but sometimes if the enemy messes up their aim, an angled 24 mm side may bounce one or two shots.

The turret front is weak against high-penetrating tanks like M3 GMC and Panzerjager I, as it is still 24 mm thick and not angled. Against weaker small-calibre rounds it may be effective to some extent. The gun mantlet is full of 'obstacles' like the armoured housings for the coaxial MG, the cannon barrels and its hydraulic recoil cylinders which, with the implementation of volumetric shells, became fairly good at catching shells and making them lose penetration. Thus the parts where shells can actually go through without being interfered are very small and hard to target. Other than the gun mantlet, the rest of the turret, when viewed from the front, is composed of extreme angles, which will certainly ricochet any shells. When shot from other directions than the front, the turret is still poorly armoured and is not very likely to stop any shells.

The post-penetration survivability is very low since the 3 crew members are seated closely to each other. An explosive-packed shot would usually knock all of them out. Even a solid shot/autocannon shells might easily knock out 2 crew members, destroying the tank.

The one positive side is, perhaps, that the transmission is not located near the front, so the Strv m/31 will not be immobilized if it gets frontally penetrated.

Armour Front (Slope angle) Sides Rear Roof
Hull 14 mm (59°) Upper Glacis
24 mm (31°) Lower Glacis
24 mm (1°) Machine Gun Port and Upper Hull Front
14 mm (35°-46°) Driver's Hatch
14 mm (39°) Machine Gunner's Hatch 		24 mm 8 mm Upper
20 mm Lower 		8 mm Front and Rear
5 mm Middle
Turret 24 mm (14°-15°) Turret front
24 mm (1°) Gun mantlet 		24 mm 24 mm 8 mm

Notes:

  • Suspension wheels, tracks and torsion bars are 15 mm thick.

Mobility

Speedforward / back
AB47 / 21 km/h
RB and SB43 / 19 km/h
Number of gears4 forward
3 back
Weight11.5 t
Engine power
AB286 hp
RB and SB150 hp
Power-to-weight ratio
AB24.9 hp/t
RB and SB13.0 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 47 21 11.5 232 286 20.17 24.87
Realistic 43 19 133 150 11.57 13.04

The mobility of the Strv m/31 is in the top range. Though not as fast as tanks like BT-5, this tank is still able to lead the charge with its great speed (both on and off road). On average the Strv m/31 can cruise at around 42 km/h, allowing it to get to any location on time. The reverse speed is also great, topping at 19 km/h meaning the player can usually retreat from danger without turning around, increasing survivability. The tank's mobility gives it more agility to conduct short range tactical manoeuvres. The hull traverse is slightly worse, often needing a forward/backward acceleration before turning. Overall, the Strv m/31 is fast and agile.

Modifications and economy

Repair cost
ABfree
RBfree
SBfree
Total cost of modifications3 440 Rp icon.png
154 Sl icon.png
Talisman cost190 Ge icon.png
Crew trainingfree
Experts1 000 Sl icon.png
Aces10 Ge icon.png
Research Aces80 000 Rp icon.png
Reward for battleAB / RB / SB
10 / 10 / 10 % Sl icon.png
100 / 100 / 100 % Rp icon.png
Modifications
Mobility Protection Firepower
Mods new tank traks.png
Tracks
Research:
440 Rp icon.png
Cost:
19 Sl icon.png
50 Ge icon.png
Mods new tank suspension.png
Suspension
Mods new tank break.png
Brake System
Research:
380 Rp icon.png
Cost:
17 Sl icon.png
45 Ge icon.png
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 sw.png
Crew Replenishment
Mods new tank horizontal aiming.png
Horizontal Drive
Research:
440 Rp icon.png
Cost:
19 Sl icon.png
50 Ge icon.png
Mods tank cannon.png
Adjustment of Fire
Research:
380 Rp icon.png
Cost:
17 Sl icon.png
45 Ge icon.png
Mods new tank vertical aiming.png
Elevation Mechanism
Research:
540 Rp icon.png
Cost:
25 Sl icon.png
60 Ge icon.png
Mods art support.png
Artillery Support
Research:
420 Rp icon.png
Cost:
19 Sl icon.png
50 Ge icon.png
Mods tank ammo.png
37mm_sw_m39_APHE_ammo_pack
Research:
420 Rp icon.png
Cost:
19 Sl icon.png
50 Ge icon.png
Mods tank ammo.png
37mm_sw_kan_APDS_ammo_pack
Research:
420 Rp icon.png
Cost:
19 Sl icon.png
50 Ge icon.png

Armaments

Main armament

37 mm kan m/38 cannon
Ammunition127 rounds
Reloadbasic crew → aces
4.1 → 3.1 s
Vertical guidance-10° / 25°
Main article: kan m/38 (37 mm)

The Strv m/31 is equipped with a 37 mm kan m/38 cannon, a good gun for a tank its rank. The cannon has adequate accuracy, which allows for the engagement of distant targets to some extent. It also has a short reload time of ~3.5 seconds ensuring quick follow-up shots, if the first shell failed to knock out the enemy target. An impressive -10° gun depression means the tank can comfortably fight among hills.

The default slpprj m/38 round is very average, with around 50 mm of penetration which is usually enough to penetrate most tanks, such as T-26, M3A1, Chi-Ha, etc. The post-penetration effect is quite poor, but this is to be expected for a solid APBC shell. The good news is the fast reload, which allows you to quickly pinpoint crew members untouched by earlier shots.

The unlockable slpgr m/39 shell comes with a 15g explosive filler which can be very helpful given that most early-war tanks are crammed with a small number of crew members. This will result in the Strv m/31 easily knocking out tanks like BT-5/7, Pz.II, Ke-Ni in one shot. One thing to note, is that the slpgr m/39 has slightly worse penetration than the default APBC, so it will struggle against better armoured tanks such as an angling M13/40.

The slpprj m/49 APDS will be a nasty surprise should the m/31 fight in an uptier. This shell has formidable penetration of 105 mm, allowing the m/31 to penetrate tough tanks such as B1 bis/ter, Matilda, or Valentine. Its velocity of more than 1,000 m/s is very fast, meaning sniping moving targets is easier. Such velocity leads to a noticeably flattened trajectory, further easing the task of sniping. Just like the default APBC, this shell has poor post-penetration damage, so be sure to aim for critical spots and use your fast reload well.

37 mm kan m/38 Turret rotation speed (°/s) Reloading rate (seconds)
Mode Capacity Vertical Horizontal Stabilizer Stock Upgraded Full Expert Aced Stock Full Expert Aced
Arcade 127 -10°/+25° ±180° N/A 15.2 21.1 25.6 28.3 30.1 4.03 3.57 3.29 3.10
Realistic 9.5 11.2 13.6 15.0 16.0

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
slpprj m/38 APBC 59 55 41 28 19 13
slpgr m/39 APHE 55 51 37 26 17 12
3,7 cm slpprj m/49 APDS 115 111 95 78 64 52
Shell details
Ammunition Type of
warhead 		Velocity
(m/s) 		Projectile
mass (kg) 		Fuse delay
(m) 		Fuse sensitivity
(mm) 		Explosive mass
(TNT equivalent) (g) 		Ricochet
0% 50% 100%
slpprj m/38 APBC 785 0.74 - - - 47° 60° 65°
slpgr m/39 APHE 800 0.74 1.2 9 15 47° 60° 65°
3,7 cm slpprj m/49 APDS 1,150 0.3 - - - 75° 78° 80°

Ammo racks

Ammo racks of the Strv m/31
Full
ammo 		1st
rack empty 		2nd
rack empty 		3rd
rack empty 		4th
rack empty 		Visual
discrepancy
127 111 (+16) 67 (+60) 45 (+82) 1 (+126) No

Notes:

  • As they are modeled by sets of 2, 4 or 5, shells disappear from the rack only after you've fired all shells in the set.
  • Turret and left flank empty: 45 (+82) shells.

Machine guns

6.5 mm ksp m/14-29 machine gun (coaxial)
Ammunition4 000 rounds
Belt capacity250 rounds
Reloadbasic crew → aces
3.9 → 3.0 s
Fire rate499 shots/min
Main article: ksp m/14-29 (6.5 mm)

The Strv m/31 is equipped with a 6.5 mm machine gun, nothing out of the ordinary. It is useful for attacking AA vehicles or more lightly armoured foes.

6.5 mm ksp m/14-29
Mount Capacity (Belt) Fire rate Vertical Horizontal
Coaxial 4,000 (250) 499 N/A N/A

Usage in battles

The Strv m/31 is a light tank with poor armour. It shouldn't be used to rush into the heat of the battle or you will get knocked out very quickly. Its armour is inadequate, it can't even stop 12.7 mm HMG fire. Instead, it should be used to flank other enemy tanks, using your excellent speed to your advantage. The Strv m/31 has an unconventional armour layout. Its frontal area (e.g. upper hull, glacis area) armour is very weak while the rear is really strong. This tank also has pretty good speed in reverse, so you can drive into battle facing backwards using your rear armour and engine to soak up damage.

Pros and cons

Pros:

  • Access to APDS ammunition that can penetrate up to 105 mm
  • APDS has high velocity, making it easy to aim at longer distances
  • Very good reverse speed, it will save you in many situations
  • Can bounce shots if angled properly

Cons:

  • APDS has no explosive filler, multiple shots will be needed to finish off a tank
  • Very weak stock shell (low penetration and post-penetration damage)
  • Armour is poor, even for a rank one reserve vehicle
  • Acceleration and top speed is quite poor, will find itself getting outrun by most vehicles.

History

The Strv m/31 was designed during the 1930s as a continuation development of tanks German designer Joseph Vollmer had designed. When the Germans took over AB Landsverk in 1920 they had the idea of a tracked and wheeled armoured vehicle, which during that time was not allowed to be developed under the Treaty of Versailles. From the design and idea Joseph Vollmer had in Berlin, this idea would continue to be developed in Sweden using AB Landsverk. The tank would be designated L-30 by Landsverk and, along with the development of the L-30 which had both wheels and tracks, there was a purely tracked model of the tank which would be designated L-10.

AB Landsverk got an order from KAF in Autumn 1931 to build one L-30 and three L-10 for trials after an in-depth analysis of the vehicles where the L-30 and L-10 would get extensive trials. L-10 would be designated Strv m/31 while L-30, which shared the same construction, would be designated Strv fm/31. After many delays, the L-30 was finally ready from the AB Landsverk, but was deemed to be too outdated and all the advanced technology that had been put into it would make it too vulnerable, as in the meantime tracks had become stronger and suspension systems a lot more comfortable in tanks, favouring the L-10 instead.

When the L-10 was delivered from the factory, it could showcase the construction with new modern ideas being presented. Instead of the usually riveted armour, the tanks were welded, which improved the survivability since riveted tanks could eject rivets from enemy shell hits and become projectiles in the crew compartment. Along with the new armour, it also used a prism periscope in glass which would improve the view for the driver and not use the slits tanks used which, though they could be closed to protect from enemy fire, in doing so would turn the driver blind which would be inefficient to have.

L-10, designated Strv m/31 by the army, had adequate armour for the time with a total of 24 mm at the front. Also like the other tanks during this period, they were equipped with a 37 mm Bofors gun and two machine guns, one in the turret and one in the hull. They were also equipped with radio equipment and a strong 150 hp Maybach engine. However, Strv m/31 would come with a lot of problems, it was considered a good vehicle on terrain but the tracks would break a lot and would have a lot of problems with the transmission.

Strv m/31 saw very little use in service and was proposed to be dug down on Gotland as a static defence. They were also proposed as command tanks. The tank will always be an important part of tank history, leading the way for how the tanks would be constructed being the most advanced tank of the time during its early days.

Devblog

Swedish tanks aren't very well known even by many enthusiastic historians or fans of military vehicles. However, many of the design and technological solutions conceived by Swedish tank designers were unique and rather practical. Sweden's armoured vehicles are truly fascinating, and the Swedish ground vehicle line in War Thunder will present to you some highly original tanks with one-of-a-kind features and gameplay finer points. We'll start our overview of the Swedish tech tree by looking at the first tank starting the progress of all the Swedish ground vehicles. Meet the reserve Strv m/31 (from "Stridsvagn", Swedish for "tank"), a 1935 light tank. According to some experts, this little tank came close to being the most high-tech tank of its time!

In 1930, the Swedish firm Landsverk developed two tank designs – one fully tracked and the other with a wheel/track arrangement – differing in their chassis construction and armour. In the autumn of 1931, the Swedish government ordered four experimental prototypes – one wheel-and-track and the other three fully tracked. The versatile tank could switch from tracks to wheels in an incredible 30 seconds flat and reach speeds of up to 80 km/h in such a configuration! However, the wheels were unable to bear the weight of substantial armour, so it was limited to 14 mm for this modification. The fully tracked version could cope with armour up to 24 mm thick, which is pretty respectable for a pre-war vehicle. Moreover, the designers took a risk by choosing welded armour plating over the more common riveted design, this also had its advantages. Even more interesting is that they set the angle of the frontal armour plate in order to increase the chance of enemy shells ricocheting. Put into service under the designation Strv m/31, the new tank was given the Maybach petrol engine, which was able to provide a power-to-weight ratio of approximately 17-18 horsepower per ton. The tank's armament comprised a 37 mm cannon with 122 rounds. All of the prototypes were put into service, though they required certain improvements. The vehicles' weak point was their unreliable and difficult-to-maintain suspension, as well as the tanks' overreliance on foreign-made components. The tanks were used as training vehicles.

Media

Skins
Images
  • Strv m 31 WTWallpaper 01.jpg
  • Strv m 31 WTWallpaper 02.jpg
  • Strv m 31 WTWallpaper 03.jpg
  • Strv m 31 WTWallpaper 04.jpg
  • Strv m 31 WTWallpaper 05.jpg
  • Strv m 31 WTWallpaper 06.jpg
Videos
The Shooting Range #191 - Metal Beasts section at 00:50 discusses the Strv m/31.

See also

Similar role

External links


AB Landsverk
Light Tanks 
L-10  Strv m/31
L-60  Strv m/38 · Strv m/39 · Strv m/40L
Pbil m/40  Pbil m/40
Strv 74  Strv 74
Unimog 404  U-SH 405
Medium Tanks 
Lago  Lago I · Strv m/42 EH · Ikv 73 · Strv m/42 DT
Tank Destroyers 
Ikv 72  Ikv 72 · Ikv 103
Pvkv m/43  Pvkv m/43 (1946) · Pvkv m/43 (1963)
Pvkv II/III  Pvkv II · Pvkv III
SPAA  Pvlvv fm/42 · L-62 ANTI II

Sweden light tanks
L-60  Strv m/38 · Strv m/39 · Strv m/39 TD · Strv m/40L
Strv m/41  Strv m/41 S-I · Strv m/41 S-II
Ikv 91  Ikv 91 · Ikv 91-105
CV 90  Strf 9040B · Strf 9040C · Strf 9040 BILL
  CV 90105 · CV 90120
Wheeled  Pbil m/40 · U-SH 405
Other  Strv m/31 · Strv 74 · Pbv 501
Finland  Vickers Mk.E · ▄T-26E · BT-42 · ▄PT-76 · CV 9030FIN · CT-CV 105HP
Denmark  CV 9035DK

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