Pvlvv fm/42

Pvlvv fm/42

Pvlvv fm/42

Sweden

I Rank

Battle rating:

AB	RB	SB
1.3	1.7	1.3

Class:

SPAA

Research:4 000

Purchase:2 100

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Description

The Pansarvärnslavettvagn 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

RB195 → 250

SB262 → 337

Total cost of modifications4 430

2 670

Talisman cost300

Crew training600

Experts2 100

Aces45

Research Aces110 000

Reward for battleAB / RB / SB

20 / 20 / 20 %

100 / 100 / 100 %

Modifications

Mobility	Protection	Firepower
Tracks Research: 220 Cost: 135 50 Suspension Research: 200 Cost: 120 45 Brake System Research: 200 Cost: 120 45 Filters Research: 370 Cost: 220 80 Transmission Research: 480 Cost: 290 105 Engine Research: 480 Cost: 290 105	Improved Parts Research: 220 Cost: 135 50 Improved FPE Research: 200 Cost: 120 45 Crew Replenishment Research: 370 Cost: 220 80	Horizontal Drive Research: 220 Cost: 135 50 20mm_sw_kan_HE_ammo_pack Research: 220 Cost: 135 50 Adjustment of Fire Research: 200 Cost: 120 45 20mm_sw_kan_AP_ammo_pack Research: 200 Cost: 120 45 Elevation Mechanism Research: 370 Cost: 220 80 Artillery Support Research: 480 Cost: 290 105

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°

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

• 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.

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.

Penetration statistics
Belt	Penetration @ 0° Angle of Attack (mm)
	10 m	100 m	500 m	1,000 m	1,500 m	2,000 m
Default	42	40	30	22	16	11
slsgr m/42	2	2	2	2	2	2
slpgr m/42	42	40	30	22	16	11

Belt details
Belt	Type of warhead	Velocity (m/s)	Projectile Mass (kg)	Fuse delay (m)	Fuse sensitivity (mm)	Explosive Mass (TNT equivalent) (g)	Ricochet
							0%	50%	100%
slsgr m/42	HEFI-T	845	0.14	0	0.1	6	79°	80°	81°
slpgr m/42	AP-T	845	0.14	N/A	N/A	N/A	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	2 (+1) 72 (+36)	1 (+2) 36 (+72)	0 (+3) 0 (+108)	No

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
• Fast reload
• Effective anti-tank performance
• Effective in flanking manoeuvres
• Low profile
• High rate of fire
• Large drum capacity of 36 rounds
• Great gunsight zoom

Cons:

• Low ammo count
• Poor survivability
• Insufficient elevation for the cannon
• Vulnerable to MGs from sides and back
• Low crew count

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

• Skins and camouflages for the Pvlvv fm/42 from live.warthunder.com.

Images

• 

  Pvlvv fm/42 in desert livery

• 

  Pvlvv fm/42 in standard livery

• 

  Pvlvv fm/42 engaging an LVT

See also

• Flakpanzer I
• AS 42
• Type 94

External links

Paste links to sources and external resources, such as:

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