Difference between revisions of "Pvlvv fm/42"

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{{Specs-Card|code=sw_pvlvv_fm42}}
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{{Specs-Card
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|code=sw_pvlvv_fm42
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|images={{Specs-Card-Image|GarageImage_Pvlvv_fm42.jpg|ArtImage Pvlvv fm-42.png}}
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}}
  
 
== 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.'' -->
[[File:GarageImage_Pvlvv_fm42.jpg|420px|thumb|left]]
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{{Break}}
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The '''{{Specs|name}}''' (shortened '''{{Specs|pseudonym}}''') is a rank {{Specs|rank}} Swedish SPAA {{Battle-rating}}. It was introduced in [[Update 1.97 "Viking Fury"]] as the Swedish rank I self-propelled anti-air vehicle.
The '''{{Specs|name}}''' is a rank {{Specs|rank}} Swedish SPAA {{Battle-rating}}. It was introduced in [[Update 1.97 "Viking Fury"]].
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Historically the {{Specs|name}} was a Swedish attempt at creating a self propelled platform for the Bofors 20 mm anti-tank/anti-air autocannon L/70 (Swedish designation ''20 mm automatkanon (akan) m/40''). The idea was to reuse the chassis of the failed Landsverk L-120 prototype tankette and fitting it with the aforementioned weapon to trial the concept. The trials were somewhat successful and would lead to the development of the Swedish SPAA Lvkv fm/43.
  
 
== General info ==
 
== General info ==
 
=== Survivability and armour ===
 
=== Survivability and armour ===
The Pvlvv fm/42 is a fairly weak vehicle in terms of survivability, it features no meaningful protection from any angle, with only 10mm of armour protecting the front of the hull and 16mm of effective armour protecting the gunner. This armour is superficial really, as even heavy machine guns will have no trouble getting through the armour of the vehicle, and seeing as it's only manned by two crew, a shot through the flat armour of the drivers port will easily knock the vehicle out of action. Additionally as it's open-topped it's very vulnerable from the air, the gun can't angle directly upwards, meaning the gunshield  can't be used to protect against enemy aircraft. This vehicle may survive a poorly placed shot, but most of the time the armour is not in any way reliable.
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{{Specs-Tank-Armour}}
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<!-- ''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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The {{PAGENAME}} is a fairly weak vehicle in terms of survivability, at least in Realistic and Simulator modes where it will be knocked out after losing one crew member. It features no meaningful protection from any angle, with only 10 mm of armour protecting the front of the hull and 16 mm of effective armour protecting the gunner. This armour is superficial really, as even heavy machine guns will have no trouble getting through the armour of the vehicle, and seeing as it's only manned by two crew, a shot through the flat armour of the drivers port will easily knock the vehicle out of action. Additionally as it's open-topped, it's very vulnerable from the air, and the gun can't angle directly upwards, meaning the gun shield can't be used to protect against enemy aircraft. This vehicle may survive a poorly placed shot, but most of the time the armour is not in any way reliable.
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In Arcade, it is far better. The light armour and spaced out crew means shots are unlikely to kill both crew at once, while the gun shield and enclosed driver provides average protection for a Rank I SPAA. While crew replenishing, the gun also works despite the gunner being knocked out, meaning the vehicle can defend itself even after some penetrating hits.
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 +
 
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'''Armour type:'''
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* Rolled homogeneous armour
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* Cast homogeneous armour (gun mantlet)
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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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| Hull || 10 mm (18-28°) ''Upper plate'' <br> 6 mm (73°) ''Upper glacis'' <br> 8 mm (46-50°) ''Lower glacis'' || 8 mm (34°) ''Top'' <br> 13 mm ''Front'' <br> 8 mm (24°) ''Bottom''  || 8 mm (21°) ''Upper plate'' <br> 8 mm (26°) ''Lower plate'' || 6 mm (17°) ''Front glacis'' <br> 5 mm ''Crew compartment'' <br> 5 mm (9°) ''Engine compartment''
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|-
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| Gun shield || 13 mm (28°)
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!
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!
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!
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|-
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|}
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'''Notes:'''
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 +
* Suspension wheels and torsion bars are 10 mm thick, while tracks are 15 mm thick.
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* Belly armour is 5 mm thick.
  
 
=== Mobility ===
 
=== 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.'' -->
 
<!-- ''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= 121|rbMinHp= 75}}
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{{tankMobility|abMinHp=121|rbMinHp=75}}
  
The mobility and speed of the {{PAGENAME}} is fairly effective, it won't outpace many enemy light vehicles around this battle rating but it is fast enough to get where it needs to be in the map without much trouble. Off-road it can cruise at a max of 54 / 38 km/h (AB/RB), making it one of the fastest Swedish ground vehicles at its rank. It can change direction and manoeuvre well enough, and has a reverse speed of -6 km/h, which isn't vastly impressive, but is enough to occasionally get you out of trouble. However, as the engine is fairly weak it will struggle to climb steep hills, so try to approach these obstacles at an angle to increase the friction on the tracks.
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[[File:Pvlvv fm-42 Elevation.jpg|thumb|400px|The max elevation angle of the Pvlvv fm/42]]
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The mobility and speed of the {{PAGENAME}} is fairly effective, it won't outpace many enemy light vehicles around this battle rating but it is fast enough to get where it needs to be in the map without much trouble. Off-road it can cruise at a max of 54 / 38 km/h (AB/RB), making it one of the fastest Swedish ground vehicles at its rank. It can change direction and manoeuvre well enough, and has a reverse speed of -6 km/h, which isn't vastly impressive, but is enough to occasionally get the vehicle out of trouble. However, as the engine is fairly weak it will struggle to climb steep hills, so try to approach these obstacles at an angle to increase the friction on the tracks.
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=== Modifications and economy ===
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{{Specs-Economy}}
  
 
== Armaments ==
 
== Armaments ==
[[File:Pvlvv fm-42 Elevation.jpg|thumb|458x458px|The max elevation angle of the Pvlvv fm/42]]
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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|lvakan m/40B (20 mm)}}
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The Pvlvv fm/42 is equipped with the m/40B 20 mm cannon, which sports effective performance against tanks and aircraft if the rounds hit, and especially regarding aircraft - that's not an easy task. The cannon can only elevate to 45 degrees, which commonly isn't enough to get an attack angle on most aircraft as they will be flying too high up, making this quite a tedious anti-air vehicle to use in its intended role.
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{| class="wikitable" style="text-align:center" width="100%"
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|-
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! colspan="6" | [[lvakan m/40B (20 mm)|20 mm lvakan m/40B]] || colspan="5" | Turret rotation speed (°/s) || colspan="4" | Reloading rate (seconds)
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|-
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! Mode !! Capacity (Belt) !! Fire rate !! 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" | 108 (36) || rowspan="2" | 360 || rowspan="2" | -10°/+45° || rowspan="2" | ±180° || rowspan="2" | N/A || 25.01 || 34.61 || 42.03 || 46.48 || 49.45 || rowspan="2" | 1.30 || rowspan="2" | 1.15 || rowspan="2" | 1.06 || rowspan="2" | 1.00
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|-
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! ''Realistic''
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| 16.90 || 19.88 || 24.14 || 26.70 || 28.40
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|-
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|}
  
=== Main armament ===
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==== Ammunition ====
The Pvlvv fm/42 is equipped with the m/40B 20mm cannon, which sports effective performance against tanks and aircraft if the rounds hit, and especially regarding aircraft- that's not an easy task. The cannon can only elevate to 45 degrees, which commonly isn't enough to get an attack angle on most aircraft as they will be flying too high up, making this quite a tedious anti-air vehicle to use in its intended role. It comes with three belts-
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A further drawback of this vehicle's armament is the total ammo count at only 108 rounds with the possibility of taking 3 belts. This hugely limits its performance, especially against aircraft as acquiring the lead will usually take a fair few shots. By the time a critical shot is landed, most of the ammo will likely be gone. For this reason, it's not recommended to take a magazine of the full HE belt, as this will take up a third of the {{PAGENAME}}'s total potential ammo, meaning a third of the shots will have no effect against enemy ground targets, and given that attacking ground vehicles is a more adept method of play for this vehicle, it is best to maximise the {{PAGENAME}}'s anti-tank ability. The AP belt can cut through a max of 42 mm of flat armour, so at close range the vehicle will have no trouble knocking out the majority of enemy vehicles.
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Once unlocked, it's recommended to take either three belts of AP rounds, or two belts of AP rounds with one Default belt for engaging aircraft, as the belt is still effective against both types of targets. Players can switch between this belt easily as well as the reload for changing belts is only 1.3 seconds.
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* '''Default:''' {{Annotation|AP-T|Armour-piercing tracer}}{{-}}{{Annotation|HEFI-T|High-explosive fragmentation incendiary tracer}}{{-}}{{Annotation|HEFI-T|High-explosive fragmentation incendiary tracer}} - A 2-to-1 mix of HE and AP rounds, an effective, versatile belt.
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* '''slsgr m/42:''' {{Annotation|HEFI-T|High-explosive fragmentation incendiary tracer}} - Ineffective against ground vehicles but adequate for aircraft.
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* '''slpgr m/42:''' {{Annotation|AP-T|Armour-piercing tracer}} - Very effective against ground vehicles while still being able to damage aircraft.
  
* Default - A 1 to 1 mix of HE and AP rounds, an effective, versatile belt.
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{{:lvakan m/40B (20 mm)/Ammunition|Default AP-T, slsgr m/42, slpgr m/42}}
* slsgr m/42 - A pure HE belt, Ineffective against ground vehicles but adequate for aircraft.
 
* slpgr m/42 - A pure AP belt- Very effective against ground vehicles while still being able to damage aircraft.
 
  
A further drawback of this vehicle's armament is the total ammo count at only 108 rounds with the possibility of taking 3 belts, this hugely limits its performance especially against aircraft as acquiring the lead will usually take a fair few shots, so by the time you've landed a critical shot most of your ammo will likely be gone. For this reason its not recommended to take a magazine of the full HE belt, as this will take up a third of your total potential ammo, meaning a third of your shots will have no effect against enemy ground targets, and given that attacking ground vehicles is a more adept method of play for this vehicle you're going to want to maximise its anti-tank ability, the AP belt can cut through a max of 42mm of flat armour, so at close range you'll have no trouble knocking out the majority of enemy vehicles.
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==== [[Ammo racks]] ====
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[[File:Ammoracks_Pvlvv fm-42.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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! Ammo<br>type
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! 1st<br>rack empty
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! 2nd<br>rack empty
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! 3rd<br>rack empty
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! Visual<br>discrepancy
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|-
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| '''3 <br> 180''' || ''Belts''<br>''Rounds'' || 2&nbsp;''(+1)'' <br> 72&nbsp;''(+36)'' || 1&nbsp;''(+2)'' <br> 36&nbsp;''(+72)'' || 0&nbsp;''(+3)'' <br> 0&nbsp;''(+108)'' || No
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|-
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|}
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'''Notes''':
  
Once unlocked it's recommended to take either three belts of AP rounds, or two belts of AP rounds with one Default belt for engaging aircraft, as the belt is still effective against both types of targets. You can switch between this belt easily as well as the reload for changing belts is only 1.3 seconds.
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* Ammunition is modelled as 12 boxes of 9 rounds. A belt represents 36 rounds.
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* Since the total ammo count is low, it is recommended to carry the maximum.
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* Playing in the vicinity of an allied capture point will help restock while in-game.
  
 
== Usage in battles ==
 
== Usage in battles ==
[[File:Fm42 3.jpg|thumb|742x742px|The Pvlvv fm/42 engaging a BT-7]]
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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).'' -->
Despite being classed as an SPAA vehicle, it truly excels at fighting ground vehicles. The lack of elevation for the cannon makes engaging aircraft tricky and sometimes impossible if the map is quite flat, as to engage aircraft this vehicle needs to be positioned on high ground or at an angle on the terrain. In general its not recommended to attempt to engage aircraft unless you're very confident you can take them out in one burst, as if an aircraft enemy notices you, they'll also likely know you can't elevate your gun very high, so they will simply dive right down on top of you to strafe out the crew, which is a fairly easy task as from the top the crew have no protection.  
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[[File:Fm42 3.jpg|thumb|400px|The Pvlvv fm/42 engaging a BT-7]]
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'''Anti air:'''
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The lack of elevation for the cannon makes engaging aircraft tricky and sometimes impossible if the map is quite flat, as to engage aircraft this vehicle needs to be positioned on high ground or at an angle on the terrain. In general, it's not recommended to attempt to engage aircraft unless the player is confident that the plane can be taken out in one burst, as if an enemy aircraft notices the {{PAGENAME}}, they'll also likely know the {{PAGENAME}}'s flaw of being unable to elevate the gun very high, so they will simply dive right down on top of the vehicle to strafe out the crew, which is a fairly easy task as from the top the crew have no protection. Therefore, the player needs to pay constant attention to the locations and distances of enemy aircraft, and always face th gun shield to them to avoid having the gunner exposed and strafed.
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Due to the extremely limited ammo capacity, this SPAA cannot enjoy the luxury of spraying shells at low-flying planes. The most potent way of downing planes is to do head-on with them as this method uses little ammo. First, locate an enemy plane and fire single shots towards their flight path. These shots would certainly miss but will hopefully get the plane's attention. Most planes might choose to strafe an SPAA for an easy kill. If they do start flying towards you, immediately enter gunner view and zoom in. This SPAA has a very good gunsight, allowing the player to clearly view a target precisely track it. As the plane dive at you, aim slightly upwards at it (at the tip of its vertical stabiliser) to compensate for shell drop. The more vertical the dive is, the closer you should aim for the very centre of the fuselage. Then give a 1-second burst while very slightly moving the mouse up and down to enlarge your shell spread, increasing the chance of scoring hits. Of course do not spread too much, the shells should be concentrated at and around the fuselage. Usually 2-4 hits will guarantee a critical hit if not a kill.
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Note that even if the player has the 'camera from tank gunner view' ticked off (gun camera will be within gun barrel), the gun camera's location of this SPAA will still be below the barrel. Therefore if the target is close, aim down a bit to compensate for such layout.
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 +
'''Anti tank:'''
  
As this vehicle has very little ammunition engaging ground vehicles allows you to potentially maximise your shots on target, engaging aircraft usually results in lots of missed shots, which largely isn't too much of a problem generally for SPAA as they're usually equipped with lots of ammunition, but as this vehicle isn't all of your shots need to count, and as leading your shots on ground targets is much more consistent that is the recommended way to play.
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Despite being classed as an SPAA vehicle, it truly excels at fighting ground vehicles. As this vehicle has very little ammunition, engaging ground vehicles allows the {{PAGENAME}} to potentially maximise its shots on target. Engaging aircraft usually results in lots of missed shots, which largely isn't too much of a problem generally for SPAA as they're usually equipped with lots of ammunition, but as this vehicle isn't, all shots need to count, and as such leading shots on ground targets is much more consistent that it is the recommended way to play.
  
At close range the AP belt will be able to deal with most enemy vehicles easily, though it will struggle with some french vehicles such as the B1 Bis, S.35, and even some of the reserve vehicles. It's important to know your enemy and only engage if you're certain you can cause critical damage you don't want to waste shots or waste your life, so learning the general armour layout of your enemies is an important factor here.  
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At close range, the AP belt will be able to deal with most enemy vehicles easily, though it will struggle with some French vehicles such as the [[B1 bis]], [[S.35]], and even some of the reserve vehicles. It's important to know the enemy and only engage if absolutely certain the gun can cause critical damage. Don't waste shots and avoid being destroyed, so learning the general armour layout of the enemies is an important factor here.
  
Aim to play around close range sight-lines if possible, in these locations your shots will be easier to aim and your rounds will have more penetration which is important to consider as their penetration performance drops off considerably at distances, at 500m the shots can only cut through 30mm of flat armour which isn't enough to deal with most enemies quickly if at all.  
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Aim to play around close-range sight-lines if possible, in these locations, shots will be easier to aim and the 20 mm rounds will have more penetration which is important to consider as their penetration performance drops off considerably at distances, at 500 m the shots can only cut through 30 mm of flat armour which isn't enough to deal with most enemies quickly if at all.
  
Luckily as this vehicle is quite small it's fairly easy to slip around the map unnoticed, and allows you to be able to hide in nooks and corners to ambush your enemies, waiting in ambush at close range; around a cap or watching a corner is the safes, most consistent way to play. Although if you're confident you can simply drive around in a manner similar to that of a conventional tank, due to the autocannon you can spray enemies down at close range without necessarily aiming, as it's quite likely you'll disable them before the can fire back at you, playing this way is certainly possible but due to how weak this vehicle is it's only recommend if you're very confident and have the vehicle fully upgraded. Do also be mindful of playing around very combat heavy areas, as these locations are commonly rife with artillery fire which this vehicle is hugely weak to, so aim to engage at close range still, but try to avoid the bulk of combat, utilise side roads and pathways out of the way to creep up to enemies on their sides. Additionally, if possible try to play close to friendly cap points, as you can use them to replenish your ammo supply which will be vital in long matches.
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Luckily, as this vehicle is quite small, it's fairly easy to slip around the map unnoticed, and allows the {{PAGENAME}} to be able to hide in nooks and corners to ambush the enemy. Waiting in ambush at close range, around a cap or watching a corner, is the safest, most consistent way to play the {{PAGENAME}}. Although if confident, the {{PAGENAME}} can simply drive around in a manner similar to that of a conventional tank by spraying enemies down with the autocannon at close range without necessarily aiming, as it's quite likely the gunfire will disable them before the can fire back. Playing this way is certainly possible, but due to how weak this vehicle is, it's only recommend if the {{PAGENAME}} player is very confident and have the vehicle fully upgraded. Do also be mindful of playing around very combat heavy areas, as these locations are commonly rife with artillery fire which this vehicle is hugely weak to, so aim to engage at close-range still, but try to avoid the bulk of combat, utilise side roads and pathways out of the way to creep up to enemies on their sides. Additionally, if possible, try to play close to friendly capture points, as the {{PAGENAME}} can use them to replenish its ammo supply which will be vital in long matches.
  
[[File:Fm42 1.jpg|thumb|443x443px|Pvlvv fm/42 in winter livery]]
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[[File:Fm42 1.jpg|thumb|400px|Pvlvv fm/42 in winter livery]]
  
 
=== Pros and cons ===
 
=== 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:'''
 
'''Pros:'''
  
 
* Decent mobility
 
* Decent mobility
* Fast reload
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* Extremely fast reload allows the Pvlvv fm/42 to nearly seamlessly fire off two magazines before the gun finally overheats and jams
* Effective Anti-tank performance
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* Single magazine rearm on a capture point takes about 4 seconds, which allows SPAA to completely resupply while fighting back
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* Effective anti-tank performance, particularly in flanking manoeuvres
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* Reasonably high rate of fire
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* Large drum capacity of 36 rounds
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* Great gunsight zoom
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* Less noticeable than truck SPAAs of other nations (irrelevant in AB)
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 +
'''Cons:'''
  
*
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* Overall low ammo count
 +
* Rate of fire is high enough to overwhelm light vehicles, but isn't high enough to just obliterate tanks or to crash down planes by firing randomly, steady aim is required
 +
* Poor survivability due to low crew count and vulnerability to rifle-calibre machine guns from the sides and the back
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* Insufficient elevation for the cannon, often unable to fire at planes which are attacking from above
  
'''Cons:'''
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== History ==
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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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Not much is known about this tank since only one was ever built and never put into active service. The project went under the generic name ''20 mm pansarvärnsluftvärnsbandlavettage'' (20 mm anti-tank, anti-air, tracked-mount), which can be abbreviated to ''20 mm pvlvblav'' using the Swedish abbreviation system, which was a project to trial the concept of a self-propelled anti-air gun. The Swedish army had briefly trialled the Landsverk L/62 Anti I in the late '30s but no orders were made. However, with the start of WWII, it became clear that the Swedish tank units needed self-propelled anti-air support. Initially it was unknown what type of weapon was needed. On one side there was the quick firing 20 mm Bofors L/70 gun which was effective at short range engagements, and on the other side was the slower firing 40 mm Bofors L/60 gun which was effective at medium range engagements. In the end it was decided to trial both systems on self-propelled platforms.
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As the end-goal was to produce an anti-air vehicle for the Swedish tank units, it was preferred if the trial vehicles were armoured and had the same mobility as the tanks. However to save money it was decided to use existing chassis for the trial vehicles instead of building new dedicated designs. The size of the 40 mm Bofors L/60 meant that it was too big for any existing tank chassis available, and had to be mounted on a terrain truck for trials. A few vehicles were built and one of these vehicles became the [[Lvtdgb m/40]]. The 20 mm Bofors L/70 however was small enough to be fitted to an existing tank chassis. As to not use up an in service tank chassis it was decided to use the chassis of the failed Landsverk L-120 tankette prototype, which had competed against the Czech CKD AH-IV tankette to become the strv m/37 and lost due to time constraint and cost.
  
* Low ammo count
+
The L-120 tankette was effectively and visually a downscaled Landsverk L-60 (the basis for the [[strv m/38]], [[strv m/39]] & [[strv m/40L]]), but with a 2 man crew and a small turret fitted with two 8 mm machine guns. To trial the 20 mm SPAAG concept the old turret had to be removed. In place of the turret an open turret ring was fitted. On this turret ring a seat and 20 mm mount was fitted. The 20 mm mount was an existing mount used for the 20 mm Bofors L/70, which had been cut down and modified to fit the turret ring and allow elevation of the gun from the seat. The mount had also been fitted with a large armoured shield in front of it to protect the gunner from frontal small arms fire and fragmentation.
* Poor survivability
 
* Insufficient elevation for the cannon
 
  
*
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The final trial vehicle was trialled sometime around 1942 but not much information is available on its actual tests. The trials seems to have gained some positive results however, as the Swedish army did order an anti-air tank in 1943 that was to be fitted with 2-3 x 20 mm Bofors L/70 cannons in an armoured turret. This vehicle would eventually evolve into the lvkv fm/43 SPAAG, which during its development traded the 20 mm guns for two 40 mm Bofors L/60 guns.
  
== History ==
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What happened to the "Pvlvv fm/42" trial vehicle is not known but it was probably used as a target on a target range like so many other vehicles of its type.
''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).''
 
  
 
== Media ==
 
== Media ==
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<!-- ''Excellent additions to the article would be video guides, screenshots from the game, and photos.'' -->
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;Skins
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* [https://live.warthunder.com/feed/camouflages/?vehicle=sw_pvlvv_fm42 Skins and camouflages for the {{PAGENAME}} from live.warthunder.com.]
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 +
;Images
 
<gallery mode="nolines" widths="240" heights="240">
 
<gallery mode="nolines" widths="240" heights="240">
 
File:Fm42 2.jpg|Pvlvv fm/42 in desert livery
 
File:Fm42 2.jpg|Pvlvv fm/42 in desert livery
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== 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:''
 +
* ''reference to the series of the vehicles;''
 +
* ''links to approximate analogues of other nations and research trees.'' -->
  
 
* [[Flakpanzer I]]
 
* [[Flakpanzer I]]
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== External links ==
 
== External links ==
 
''Paste links to sources and external resources, such as:''
 
''Paste links to sources and external resources, such as:''
 
 
* ''topic on the official game forum;''
 
* ''topic on the official game forum;''
* ''encyclopedia page on the tank;''
 
 
* ''other literature.''
 
* ''other literature.''
  
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{{TankManufacturer AB Landsverk}}
 
{{Sweden anti-aircraft vehicles}}
 
{{Sweden anti-aircraft vehicles}}

Revision as of 09:06, 5 March 2023

Rank VI USA | Premium | Golden Eagles
A-10A Thunderbolt (Early)
Pvlvv fm/42
sw_pvlvv_fm42.png
GarageImage Pvlvv fm42.jpg
ArtImage Pvlvv fm-42.png
Pvlvv fm/42
AB RB SB
1.3 1.7 1.3
Class:
Research:4 000 Specs-Card-Exp.png
Purchase:2 100 Specs-Card-Lion.png
Show in game

Description

The Pansarvärnslavettvagn fm/42 (shortened Pvlvv fm/42) is a rank I Swedish SPAA with a battle rating of 1.3 (AB/SB) and 1.7 (RB). It was introduced in Update 1.97 "Viking Fury" as the Swedish rank I self-propelled anti-air vehicle.

Historically the Pansarvärnslavettvagn fm/42 was a Swedish attempt at creating a self propelled platform for the Bofors 20 mm anti-tank/anti-air autocannon L/70 (Swedish designation 20 mm automatkanon (akan) m/40). The idea was to reuse the chassis of the failed Landsverk L-120 prototype tankette and fitting it with the aforementioned weapon to trial the concept. The trials were somewhat successful and would lead to the development of the Swedish SPAA Lvkv fm/43.

General info

Survivability and armour

Armourfront / side / back
Hull8 / 8 / 8
Turret13 / 0 / 0
Crew2 people
Visibility69 %

The Pvlvv fm/42 is a fairly weak vehicle in terms of survivability, at least in Realistic and Simulator modes where it will be knocked out after losing one crew member. It features no meaningful protection from any angle, with only 10 mm of armour protecting the front of the hull and 16 mm of effective armour protecting the gunner. This armour is superficial really, as even heavy machine guns will have no trouble getting through the armour of the vehicle, and seeing as it's only manned by two crew, a shot through the flat armour of the drivers port will easily knock the vehicle out of action. Additionally as it's open-topped, it's very vulnerable from the air, and the gun can't angle directly upwards, meaning the gun shield can't be used to protect against enemy aircraft. This vehicle may survive a poorly placed shot, but most of the time the armour is not in any way reliable.

In Arcade, it is far better. The light armour and spaced out crew means shots are unlikely to kill both crew at once, while the gun shield and enclosed driver provides average protection for a Rank I SPAA. While crew replenishing, the gun also works despite the gunner being knocked out, meaning the vehicle can defend itself even after some penetrating hits.


Armour type:

  • Rolled homogeneous armour
  • Cast homogeneous armour (gun mantlet)
Armour Front (Slope angle) Sides Rear Roof
Hull 10 mm (18-28°) Upper plate
6 mm (73°) Upper glacis
8 mm (46-50°) Lower glacis
8 mm (34°) Top
13 mm Front
8 mm (24°) Bottom
8 mm (21°) Upper plate
8 mm (26°) Lower plate
6 mm (17°) Front glacis
5 mm Crew compartment
5 mm (9°) Engine compartment
Gun shield 13 mm (28°)

Notes:

  • Suspension wheels and torsion bars are 10 mm thick, while tracks are 15 mm thick.
  • Belly armour is 5 mm thick.

Mobility

Speedforward / back
AB55 / 7 km/h
RB and SB50 / 6 km/h
Number of gears5 forward
1 back
Weight6.0 t
Engine power
AB162 hp
RB and SB85 hp
Power-to-weight ratio
AB27.0 hp/t
RB and SB14.2 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 55 7 6 121 162 20.17 27
Realistic 50 6 75 85 12.5 14.17
The max elevation angle of the Pvlvv fm/42

The mobility and speed of the Pvlvv fm/42 is fairly effective, it won't outpace many enemy light vehicles around this battle rating but it is fast enough to get where it needs to be in the map without much trouble. Off-road it can cruise at a max of 54 / 38 km/h (AB/RB), making it one of the fastest Swedish ground vehicles at its rank. It can change direction and manoeuvre well enough, and has a reverse speed of -6 km/h, which isn't vastly impressive, but is enough to occasionally get the vehicle out of trouble. However, as the engine is fairly weak it will struggle to climb steep hills, so try to approach these obstacles at an angle to increase the friction on the tracks.

Modifications and economy

Repair costBasic → Reference
AB209 → 268 Sl icon.png
RB195 → 250 Sl icon.png
SB262 → 337 Sl icon.png
Total cost of modifications4 430 Rp icon.png
2 670 Sl icon.png
Talisman cost300 Ge icon.png
Crew training600 Sl icon.png
Experts2 100 Sl icon.png
Aces45 Ge icon.png
Research Aces110 000 Rp icon.png
Reward for battleAB / RB / SB
20 / 20 / 20 % Sl icon.png
100 / 100 / 100 % Rp icon.png
Modifications
Mobility Protection Firepower
Mods new tank traks.png
Tracks
Research:
220 Rp icon.png
Cost:
135 Sl icon.png
50 Ge icon.png
Mods new tank suspension.png
Suspension
Research:
200 Rp icon.png
Cost:
120 Sl icon.png
45 Ge icon.png
Mods new tank break.png
Brake System
Research:
200 Rp icon.png
Cost:
120 Sl icon.png
45 Ge icon.png
Mods new tank filter.png
Filters
Research:
370 Rp icon.png
Cost:
220 Sl icon.png
80 Ge icon.png
Mods new tank transmission.png
Transmission
Research:
480 Rp icon.png
Cost:
290 Sl icon.png
105 Ge icon.png
Mods new tank engine.png
Engine
Research:
480 Rp icon.png
Cost:
290 Sl icon.png
105 Ge icon.png
Mods tank tool kit.png
Improved Parts
Research:
220 Rp icon.png
Cost:
135 Sl icon.png
50 Ge icon.png
Mods extinguisher.png
Improved FPE
Research:
200 Rp icon.png
Cost:
120 Sl icon.png
45 Ge icon.png
Mods tank reinforcement sw.png
Crew Replenishment
Research:
370 Rp icon.png
Cost:
220 Sl icon.png
80 Ge icon.png
Mods new tank horizontal aiming.png
Horizontal Drive
Research:
220 Rp icon.png
Cost:
135 Sl icon.png
50 Ge icon.png
Mods tank ammo.png
20mm_sw_kan_HE_ammo_pack
Research:
220 Rp icon.png
Cost:
135 Sl icon.png
50 Ge icon.png
Mods tank cannon.png
Adjustment of Fire
Research:
200 Rp icon.png
Cost:
120 Sl icon.png
45 Ge icon.png
Mods tank ammo.png
20mm_sw_kan_AP_ammo_pack
Research:
200 Rp icon.png
Cost:
120 Sl icon.png
45 Ge icon.png
Mods new tank vertical aiming.png
Elevation Mechanism
Research:
370 Rp icon.png
Cost:
220 Sl icon.png
80 Ge icon.png
Mods art support.png
Artillery Support
Research:
480 Rp icon.png
Cost:
290 Sl icon.png
105 Ge icon.png

Armaments

Main armament

20 mm lvakan m/40B cannon
Ammunition108 rounds
Belt capacity36 rounds
Reloadbasic crew → aces
1.3 → 1.0 s
Fire rate360 shots/min
Vertical guidance-10° / 45°
Main article: lvakan m/40B (20 mm)

The Pvlvv fm/42 is equipped with the m/40B 20 mm cannon, which sports effective performance against tanks and aircraft if the rounds hit, and especially regarding aircraft - that's not an easy task. The cannon can only elevate to 45 degrees, which commonly isn't enough to get an attack angle on most aircraft as they will be flying too high up, making this quite a tedious anti-air vehicle to use in its intended role.

20 mm lvakan m/40B Turret rotation speed (°/s) Reloading rate (seconds)
Mode Capacity (Belt) Fire rate Vertical Horizontal Stabilizer Stock Upgraded Full Expert Aced Stock Full Expert Aced
Arcade 108 (36) 360 -10°/+45° ±180° N/A 25.01 34.61 42.03 46.48 49.45 1.30 1.15 1.06 1.00
Realistic 16.90 19.88 24.14 26.70 28.40

Ammunition

A further drawback of this vehicle's armament is the total ammo count at only 108 rounds with the possibility of taking 3 belts. This hugely limits its performance, especially against aircraft as acquiring the lead will usually take a fair few shots. By the time a critical shot is landed, most of the ammo will likely be gone. For this reason, it's not recommended to take a magazine of the full HE belt, as this will take up a third of the Pvlvv fm/42's total potential ammo, meaning a third of the shots will have no effect against enemy ground targets, and given that attacking ground vehicles is a more adept method of play for this vehicle, it is best to maximise the Pvlvv fm/42's anti-tank ability. The AP belt can cut through a max of 42 mm of flat armour, so at close range the vehicle will have no trouble knocking out the majority of enemy vehicles.

Once unlocked, it's recommended to take either three belts of AP rounds, or two belts of AP rounds with one Default belt for engaging aircraft, as the belt is still effective against both types of targets. Players can switch between this belt easily as well as the reload for changing belts is only 1.3 seconds.

  • Default: AP-T · HEFI-T · HEFI-T - A 2-to-1 mix of HE and AP rounds, an effective, versatile belt.
  • slsgr m/42: HEFI-T - Ineffective against ground vehicles but adequate for aircraft.
  • slpgr m/42: AP-T - Very effective against ground vehicles while still being able to damage aircraft.

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
Default AP-T AP-T 42 40 30 22 16 11
slsgr m/42 HEFI-T 5 4 3 2 2 2
slpgr m/42 AP-T 42 40 30 21 15 10
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%
Default AP-T AP-T 815 0.15 - - - 47° 60° 65°
slsgr m/42 HEFI-T 845 0.14 0.1 0.1 10.2 79° 80° 81°
slpgr m/42 AP-T 845 0.14 - - - 47° 60° 65°

Ammo racks

Ammo racks of the Pvlvv fm/42
Full
ammo
Ammo
type
1st
rack empty
2nd
rack empty
3rd
rack empty
Visual
discrepancy
3
180
Belts
Rounds
(+1)
72 (+36)
(+2)
36 (+72)
(+3)
(+108)
No

Notes:

  • Ammunition is modelled as 12 boxes of 9 rounds. A belt represents 36 rounds.
  • Since the total ammo count is low, it is recommended to carry the maximum.
  • Playing in the vicinity of an allied capture point will help restock while in-game.

Usage in battles

The Pvlvv fm/42 engaging a BT-7

Anti air:

The lack of elevation for the cannon makes engaging aircraft tricky and sometimes impossible if the map is quite flat, as to engage aircraft this vehicle needs to be positioned on high ground or at an angle on the terrain. In general, it's not recommended to attempt to engage aircraft unless the player is confident that the plane can be taken out in one burst, as if an enemy aircraft notices the Pvlvv fm/42, they'll also likely know the Pvlvv fm/42's flaw of being unable to elevate the gun very high, so they will simply dive right down on top of the vehicle to strafe out the crew, which is a fairly easy task as from the top the crew have no protection. Therefore, the player needs to pay constant attention to the locations and distances of enemy aircraft, and always face th gun shield to them to avoid having the gunner exposed and strafed.

Due to the extremely limited ammo capacity, this SPAA cannot enjoy the luxury of spraying shells at low-flying planes. The most potent way of downing planes is to do head-on with them as this method uses little ammo. First, locate an enemy plane and fire single shots towards their flight path. These shots would certainly miss but will hopefully get the plane's attention. Most planes might choose to strafe an SPAA for an easy kill. If they do start flying towards you, immediately enter gunner view and zoom in. This SPAA has a very good gunsight, allowing the player to clearly view a target precisely track it. As the plane dive at you, aim slightly upwards at it (at the tip of its vertical stabiliser) to compensate for shell drop. The more vertical the dive is, the closer you should aim for the very centre of the fuselage. Then give a 1-second burst while very slightly moving the mouse up and down to enlarge your shell spread, increasing the chance of scoring hits. Of course do not spread too much, the shells should be concentrated at and around the fuselage. Usually 2-4 hits will guarantee a critical hit if not a kill.

Note that even if the player has the 'camera from tank gunner view' ticked off (gun camera will be within gun barrel), the gun camera's location of this SPAA will still be below the barrel. Therefore if the target is close, aim down a bit to compensate for such layout.

Anti tank:

Despite being classed as an SPAA vehicle, it truly excels at fighting ground vehicles. As this vehicle has very little ammunition, engaging ground vehicles allows the Pvlvv fm/42 to potentially maximise its shots on target. Engaging aircraft usually results in lots of missed shots, which largely isn't too much of a problem generally for SPAA as they're usually equipped with lots of ammunition, but as this vehicle isn't, all shots need to count, and as such leading shots on ground targets is much more consistent that it is the recommended way to play.

At close range, the AP belt will be able to deal with most enemy vehicles easily, though it will struggle with some French vehicles such as the B1 bis, S.35, and even some of the reserve vehicles. It's important to know the enemy and only engage if absolutely certain the gun can cause critical damage. Don't waste shots and avoid being destroyed, so learning the general armour layout of the enemies is an important factor here.

Aim to play around close-range sight-lines if possible, in these locations, shots will be easier to aim and the 20 mm rounds will have more penetration which is important to consider as their penetration performance drops off considerably at distances, at 500 m the shots can only cut through 30 mm of flat armour which isn't enough to deal with most enemies quickly if at all.

Luckily, as this vehicle is quite small, it's fairly easy to slip around the map unnoticed, and allows the Pvlvv fm/42 to be able to hide in nooks and corners to ambush the enemy. Waiting in ambush at close range, around a cap or watching a corner, is the safest, most consistent way to play the Pvlvv fm/42. Although if confident, the Pvlvv fm/42 can simply drive around in a manner similar to that of a conventional tank by spraying enemies down with the autocannon at close range without necessarily aiming, as it's quite likely the gunfire will disable them before the can fire back. Playing this way is certainly possible, but due to how weak this vehicle is, it's only recommend if the Pvlvv fm/42 player is very confident and have the vehicle fully upgraded. Do also be mindful of playing around very combat heavy areas, as these locations are commonly rife with artillery fire which this vehicle is hugely weak to, so aim to engage at close-range still, but try to avoid the bulk of combat, utilise side roads and pathways out of the way to creep up to enemies on their sides. Additionally, if possible, try to play close to friendly capture points, as the Pvlvv fm/42 can use them to replenish its ammo supply which will be vital in long matches.

Pvlvv fm/42 in winter livery

Pros and cons

Pros:

  • Decent mobility
  • Extremely fast reload allows the Pvlvv fm/42 to nearly seamlessly fire off two magazines before the gun finally overheats and jams
  • Single magazine rearm on a capture point takes about 4 seconds, which allows SPAA to completely resupply while fighting back
  • Effective anti-tank performance, particularly in flanking manoeuvres
  • Reasonably high rate of fire
  • Large drum capacity of 36 rounds
  • Great gunsight zoom
  • Less noticeable than truck SPAAs of other nations (irrelevant in AB)

Cons:

  • Overall low ammo count
  • Rate of fire is high enough to overwhelm light vehicles, but isn't high enough to just obliterate tanks or to crash down planes by firing randomly, steady aim is required
  • Poor survivability due to low crew count and vulnerability to rifle-calibre machine guns from the sides and the back
  • Insufficient elevation for the cannon, often unable to fire at planes which are attacking from above

History

Not much is known about this tank since only one was ever built and never put into active service. The project went under the generic name 20 mm pansarvärnsluftvärnsbandlavettage (20 mm anti-tank, anti-air, tracked-mount), which can be abbreviated to 20 mm pvlvblav using the Swedish abbreviation system, which was a project to trial the concept of a self-propelled anti-air gun. The Swedish army had briefly trialled the Landsverk L/62 Anti I in the late '30s but no orders were made. However, with the start of WWII, it became clear that the Swedish tank units needed self-propelled anti-air support. Initially it was unknown what type of weapon was needed. On one side there was the quick firing 20 mm Bofors L/70 gun which was effective at short range engagements, and on the other side was the slower firing 40 mm Bofors L/60 gun which was effective at medium range engagements. In the end it was decided to trial both systems on self-propelled platforms.

As the end-goal was to produce an anti-air vehicle for the Swedish tank units, it was preferred if the trial vehicles were armoured and had the same mobility as the tanks. However to save money it was decided to use existing chassis for the trial vehicles instead of building new dedicated designs. The size of the 40 mm Bofors L/60 meant that it was too big for any existing tank chassis available, and had to be mounted on a terrain truck for trials. A few vehicles were built and one of these vehicles became the Lvtdgb m/40. The 20 mm Bofors L/70 however was small enough to be fitted to an existing tank chassis. As to not use up an in service tank chassis it was decided to use the chassis of the failed Landsverk L-120 tankette prototype, which had competed against the Czech CKD AH-IV tankette to become the strv m/37 and lost due to time constraint and cost.

The L-120 tankette was effectively and visually a downscaled Landsverk L-60 (the basis for the strv m/38, strv m/39 & strv m/40L), but with a 2 man crew and a small turret fitted with two 8 mm machine guns. To trial the 20 mm SPAAG concept the old turret had to be removed. In place of the turret an open turret ring was fitted. On this turret ring a seat and 20 mm mount was fitted. The 20 mm mount was an existing mount used for the 20 mm Bofors L/70, which had been cut down and modified to fit the turret ring and allow elevation of the gun from the seat. The mount had also been fitted with a large armoured shield in front of it to protect the gunner from frontal small arms fire and fragmentation.

The final trial vehicle was trialled sometime around 1942 but not much information is available on its actual tests. The trials seems to have gained some positive results however, as the Swedish army did order an anti-air tank in 1943 that was to be fitted with 2-3 x 20 mm Bofors L/70 cannons in an armoured turret. This vehicle would eventually evolve into the lvkv fm/43 SPAAG, which during its development traded the 20 mm guns for two 40 mm Bofors L/60 guns.

What happened to the "Pvlvv fm/42" trial vehicle is not known but it was probably used as a target on a target range like so many other vehicles of its type.

Media

Skins
Images

See also

External links

Paste links to sources and external resources, such as:

  • topic on the official game forum;
  • other literature.


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 anti-aircraft vehicles
SPAA  Pvlvv fm/42 · Lvtdgb m/40 · Pbv 301 · Lvkv 42
Radar SPAA  VEAK 40 · Lvkv 9040C
SAM  Lvrbv 701 · ASRAD-R
Finland  L-62 ANTI II · ▄ZSU-57-2 · ItO 90M · ItPsV 90