Difference between revisions of "Strv 81 (RB 52)"

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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 If the historical reference turns out to be too long, take it to a separate article, taking a link to the article about the vehicle and adding a block "/History" (example: 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).'' -->
 
===Development===
 
===Development===
The tank's concept was made in 1943 when the Directorate of Tank Design, under Sir Claude Gibb, was asked to produce a new heavy cruiser tank for the General Staff under the designation ''A41'', which was to become the standard of a British "Universal Tank" to replace the separated "infantry" and "cruiser" tanks currently used. As World War II progressed and the Germans unveiled their heavier tanks with an [[KwK 36 (88 mm)|88 mm cannon]] like the [[Tiger H1|Tiger]], War Office made a revision to their design requirements to counter this threat. The requirements now include an increased durability and reliability, with the ability to protect itself against the 88 mm gun and mines, an agility similar to the [[Comet I|Comet tank]] and with good reverse speed, all while staying under a 40 ton weight.
+
The tank's concept was made in 1943 when the Directorate of Tank Design, under Sir Claude Gibb, was asked to produce a new heavy cruiser tank for the General Staff under the designation ''A41'', which was to become the standard of a British "Universal Tank" to replace the separated "infantry" and "cruiser" tanks currently used. As World War II progressed and the Germans unveiled their heavier tanks with an [[KwK36 (88 mm)|88 mm KwK36 cannon]] like the [[Tiger H1|Tiger]], War Office made a revision to their design requirements to counter this threat. The requirements now include an increased durability and reliability, with the ability to protect itself against the 88 mm gun and mines, an agility similar to the [[Comet I|Comet tank]] and with good reverse speed, all while staying under a 40 ton weight.
  
 
Responding to these requirements, the department developed a larger hulls by adapting the suspension on the Comet, lengthening with another road wheel and spacing between the wheels. The standard Christie suspension used on the previous cruiser tanks was replaced by the Horstmann suspension, which uses coil springs on two-wheel bogies on each side and is proven to be easier to maintain than the Christie suspension. The hull used a welded and sloped armour with a cast turret mounting the famous [[Ordnance QF 17-pounder (76 mm)|17-pounder cannon]]. The speed of the tank would be established by using the Rolls Meteor engine previously used on the Comet and [[Cromwell V|Cromwell]]. Despite these changes, the department concluded that the weight restriction would not allow the tank design to withstand the 88 mm rounds. The weight restriction was done so the tank would be able to be carried around in the Mk.I and Mk.II transport trailers, which had a 40-ton load. This restriction was rescinded to allow more freedom in the tank design, which showed potential to War Ministry. The heavier tank designs developed had armour equivalent to the heaviest infantry tanks like the [[Churchill Mk VII|Churchill tank]], yet with superior cross-country mobility due to improved suspension and engines.
 
Responding to these requirements, the department developed a larger hulls by adapting the suspension on the Comet, lengthening with another road wheel and spacing between the wheels. The standard Christie suspension used on the previous cruiser tanks was replaced by the Horstmann suspension, which uses coil springs on two-wheel bogies on each side and is proven to be easier to maintain than the Christie suspension. The hull used a welded and sloped armour with a cast turret mounting the famous [[Ordnance QF 17-pounder (76 mm)|17-pounder cannon]]. The speed of the tank would be established by using the Rolls Meteor engine previously used on the Comet and [[Cromwell V|Cromwell]]. Despite these changes, the department concluded that the weight restriction would not allow the tank design to withstand the 88 mm rounds. The weight restriction was done so the tank would be able to be carried around in the Mk.I and Mk.II transport trailers, which had a 40-ton load. This restriction was rescinded to allow more freedom in the tank design, which showed potential to War Ministry. The heavier tank designs developed had armour equivalent to the heaviest infantry tanks like the [[Churchill Mk VII|Churchill tank]], yet with superior cross-country mobility due to improved suspension and engines.

Revision as of 10:11, 11 November 2022

RANK 5 FRANCE
Somua SM PACK
This page is about the Swedish medium tank Strv 81 (RB 52). For the British version, see Strv 81 (RB 52) (Great Britain).
Strv 81 (RB 52)
uk_centurion_mk_3_ss11.png
GarageImage Strv 81 (RB 52).jpg
Strv 81 (RB 52)
AB RB SB
7.7 7.7 7.7
Purchase:8 020 Specs-Card-Eagle.png
Show in game

Description

The Strv 81 (RB 52) (full name: Stridsvagn 81 (RB 52)) is a premium rank V Swedish medium tank with a battle rating of 7.7 (AB/RB/SB). It was introduced during Update "Raining Fire" in the 8th Anniversary Sale as a replacement for the British version of the vehicle.

General info

Survivability and armour

Smoke grenades
Creation of a smoke screen in front of the vehicle
Armourfront / side / back
Hull76 / 51 / 38
Turret152 / 89 / 89
Crew4 people
Visibility119 %

Armour type:

  • Rolled homogeneous armour (Hull, Turret roof)
  • Cast homogeneous armour (Turret)
Armour Front Sides Rear Roof
Hull 76.2 mm (58°) Front glacis
76.2 mm (47-48°) Lower glacis
50.8 (12°) + 6 mm 38 mm (8-12°) 29 mm
8-14 mm Engine deck
Turret 152 mm (6-27°) Turret front
152 mm Gun mantlet
89 mm (5-12°) 89 mm (1-18°) 50.8 mm Border of turret
29 mm Center of turret
Armour Front Rear Roof
Cupola 152 mm 90 mm 29 mm

Notes:

  • Suspension wheels and tracks are both 20 mm thick.
  • The steel boxes around the turret and hull give a 4 mm additional protection, though this seems to be a negligible addition.
  • ATGM attached outside the turret act as ammo racks and can be detonated
  • Spaced armour plates are placed on the side of the Centurion, giving an additional 6 mm of side armour.

Mobility

Speedforward / back
AB39 / 14 km/h
RB and SB35 / 13 km/h
Number of gears5 forward
2 back
Weight50.8 t
Engine power
AB1 240 hp
RB and SB650 hp
Power-to-weight ratio
AB24.4 hp/t
RB and SB12.8 hp/t
Game Mode Max Speed (km/h) Weight (tons) Engine power (horsepower) Power-to-weight ratio (hp/ton)
Forward Reverse Stock Upgraded Stock Upgraded
Arcade 39 14 50.8 1,007 1,240 19.82 24.41
Realistic 35 13 575 650 11.32 12.8

Modifications and economy

Repair cost
AB2 743 Sl icon.png
RB3 158 Sl icon.png
SB4 414 Sl icon.png
Crew training10 000 Sl icon.png
Experts440 000 Sl icon.png
Aces1 100 Ge icon.png
Research Aces1 340 000 Rp icon.png
Reward for battleAB / RB / SB
Talisman.png 2 × 130 / 200 / 220 % Sl icon.png
Talisman.png 2 × 190 / 190 / 190 % Rp icon.png
Modifications
Mobility Protection Firepower
Mods new tank traks.png
Tracks
Mods new tank suspension.png
Suspension
Mods new tank break.png
Brake System
Mods new tank filter.png
Filters
Mods new tank transmission.png
Transmission
Mods new tank engine.png
Engine
Mods tank tool kit.png
Improved Parts
Mods extinguisher.png
Improved FPE
Mods tank reinforcement sw.png
Crew Replenishment
Mods new tank horizontal aiming.png
Horizontal Drive
Mods tank cannon.png
Adjustment of Fire
Mods tank ammo.png
84mm_britain_20pdr_APDS_ammo_pack
Mods new tank vertical aiming.png
Elevation Mechanism
Mods smoke screen.png
Smoke grenade
Mods art support.png
Artillery Support
Mods tank ammo.png
84mm_britain_Smoke_ammo_pack

Armaments

Main armament

Two-plane stabilizer
Reduces the swing of the gun in two planes while moving
Ammunition65 rounds
First-order8 rounds
Reloadbasic crew → aces
8.1 → 6.3 s
Vertical guidance-10° / 20°
Main article: kan Strv 81 (84 mm)
84 mm kan Strv 81 Turret rotation speed (°/s) Reloading rate (seconds)
Mode Capacity Vertical Horizontal Stabilizer Stock Upgraded Full Expert Aced Stock Full Expert Aced
Arcade 65 -10°/+20° ±180° Two-plane 19.0 26.4 32.0 35.4 37.7 8.19 7.25 6.68 6.30
Realistic 11.9 14.0 17.0 18.8 20.0

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 APCBC 232 229 216 201 187 173
slpprj m/54 APDS 285 283 262 239 218 198
slsgr m/53 HE 15 15 15 15 15 15
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 APCBC 1,000 9.1 N/A N/A N/A 48° 63° 71°
slpprj m/54 APDS 1,430 3.2 N/A N/A N/A 75° 78° 80°
slsgr m/53 HE 600 7.5 0 0.1 1,130 79° 80° 81°
Smoke shell characteristics
Ammunition Velocity
(m/s)
Projectile
mass (kg)
Screen radius
(m)
Screen deploy time
(s)
Screen hold time
(s)
Explosive mass
(TNT equivalent) (g)
rökgr m/53 250 9.3 13 5 20 50

Ammo racks

Ammo racks of the Strv 81 (RB 52)
Full
ammo
1st
rack empty
2nd
rack empty
3rd
rack empty
4th
rack empty
Visual
discrepancy
65 62 (+3) 33 (+32) 17 (+48) (+64) No
  • Turret empty: 62 (+3)
  • Front empty: 33 (+32)

Additional armament

Ammunition3 rounds
Flight speed220 m/s
Range3 500 m
Method of aiming
ABSemi-auto
RB and SBManual
Fire on the moveup to 5 km/h
Main article: Robot 52 (SS.11)
Robot 52 (SS.11) missile
Capacity Vertical Horizontal Stabilizer
3 N/A N/A N/A

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
RB 52 A ATGM 600 600 600 600 600 600
Missile details
Ammunition Type of
warhead
Velocity
(m/s)
Range
(m)
Projectile
mass (kg)
Fuse delay
(m)
Fuse sensitivity
(mm)
Explosive mass
(TNT equivalent) (g)
Ricochet
0% 50% 100%
RB 52 A ATGM 190 3,500 29.99 0.05 0.1 2,000 80° 82° 90°

Ammo racks

Ammo racks of the Strv 81 (RB 52)
Full
ammo
1st
rack empty
2nd
rack empty
3rd
rack empty
Visual
discrepancy
3 (+1) (+2) (+3) No

Machine guns

Ammunition3 600 rounds
Belt capacity225 rounds
Reloadbasic crew → aces
10.4 → 8.0 s
Fire rate600 shots/min
Main article: BESA (7.92 mm)
7.92 mm BESA
Mount Capacity (Belt) Fire rate Vertical Horizontal
Coaxial 3,600 (225) 600 N/A N/A

Usage in battles

The Stridsvagn 81 is essentially the Centurion Mk 3. It is an effective medium tank if played to its strengths.

If one wants to keep it simple, just use the powerful gun to snipe from distance.

More advanced tankers can utilize the not too impressive max speed (35 km/h or 22 mph) to move with this medium tank into the flanks of enemy tanks (close to the border of a map) and search for positions like hills and ridges where one can make use of the amazing -10° gun depression to hide the vulnerable lower plate of this tank. Once in position, one should use the binoculars to scout for enemies without exposing the turret. If an enemy tank is spotted that could be a potential threat, pop out a little bit and start to take out the enemies gunner/cannon barrel/cannon breech to prevent him from returning fire. Now utilize the quick reload to take out one crew member after the other to finish off the opponent. If an enemy is spotted who is exposing their side or even the rear while not aiming towards the Strv 81, shoot the engine first to immobilize and possibly even ignite the enemy tank, preventing him to take cover. The next shots should again disable the gun of the enemy, now finish the prey by shooting all crew members or, if feeling lucky, shoot an ammo rack.

The best choice to pierce enemy tanks is obviously the Shot Mk.3 (APDS) although it is quite expensive in terms of Silver Lions. The Shot Mk. 1 (APCBC) works in most situation as well but lacks penetration compared to the Mk. 3 APDS shot. The amazing penetration characteristics of this APDS shot enables this gun to pierce front plates of all Panther models (apart from the Panther II) to ranges up to 2,000 m. T-44s and Panther IIs front plates can be penetrated to ranges up to almost 1,000 m. Keep in mind though that the front plate of the T-44 is angled at 60°, so it bounces even this powerful APDS shot quite often. Even the front plate of the mighty Tiger II is not able to stop this APDS shot if not angled and the range is shorter than 100 m. However, aside from the gun, the Strv 81 has access to three potent anti-tank guided missiles.

In a head to head situation with an enemy tank approaching try to angle the Strv 81 not more than 5° degrees to either side since the side armour is quite weak (50.8 mm), try to hide the lower front plate which is a massive weak spot, while reloading turn the turret 10° to the right to maximize chances of bouncing shots (right side of the turret front has some extra armour) and keeping the gunner alive.

How to use an ATGM

The addition of the ATGM means the Strv 81 has the potential to act as a long-range support vehicle from the rear lines or the flanks. Prop up the Centurion in a well fortified and safe location and use it as a base of fire and launch missiles onto the enemies' front or sides. With the high amount of penetration available on the SS.11 missiles, even a glancing hit can do massive damage to the hit enemy tank.

The SS.11 missiles attached to the right side of the Strv 81 turret provide up to 600 mm of penetration upon impact, making all but the most deflected shots potent to any targets. Three are available for immediate usage and are guided by a MCLOS system. The missile have a trajectory of going up for a distance before leveling, creating a "dead zone" of up to 200 m that the missile cannot adequately engage in.

In arcade mode, the missile guidance system is relatively uncomplicated in aiming. Simply aim the crosshair onto the desired target and the missile will adjust to fit into the crosshair. The guidance system is sensitive as such it is not recommended to rapidly swing the crosshair around during the missile trajectory to keep it stable and on track. Once depleted, the missile will gradually reload to refill the launch racks.

In realistic and simulator mode, the missile is guided by the tank movement keys of [W], [A], [S], and [D]. [W] and [S] moves the missile vertically while [A] and [D] moves the missile horizontally. The guidance system will not activate until the missile clears its dead zone. The system is sensitive as such it is not recommended to rapidly tap the keys for movement else the missile moves out of the scope and away from the controls. Once depleted, the missile will not automatically reload and must be driven onto a captured control point for reloads.

Pros and cons

Pros:

  • Really nice 20-pounder gun with a surprising reload rate. An ace crew can reload the gun in an excellent 6.3 seconds.
  • APDS shell provides great ballistics and penetration
  • Depression and good optics translate to adequate firing capacities.
  • Has 3 keyboard guided ATGMs that have an astounding 600 mm of HEAT penetration. No tank at this BR can absorb that kind of penetration.
  • The turret has a lot rounded angles. Will bounce some powerful shells every so often.
  • There's a large 17 mm steel plate sitting between the driver and the reserve ammo, reducing the likelihood of ammo explosion.
  • Decent engine power. Can climb hills and accelerate to its top speed rather quickly, with workable reverse too.
  • Gets the usual bonuses that come with all Premium tanks.

Cons:

  • The turret protection is unreliable thanks to the mediocre armour. 3 of the 4 crew members are in the turret.
  • The lower plate and side plates are weak, vulnerable to even small calibre APBC or APHE.
  • Very little engine deck armour. Susceptible to artillery and strafing aircraft.
  • APDS shell might require several shots to destroy tanks.
  • The 8-round ready ammo rack is used up rather quickly. If all 8 rounds are expended, the tanks fire rate drops significantly until first-stage ammo refill.
  • ATGM's are really slow and landing an impact can be difficult.
  • Very slow for a medium tank. Some heavy tanks might be faster.

History

Development

The tank's concept was made in 1943 when the Directorate of Tank Design, under Sir Claude Gibb, was asked to produce a new heavy cruiser tank for the General Staff under the designation A41, which was to become the standard of a British "Universal Tank" to replace the separated "infantry" and "cruiser" tanks currently used. As World War II progressed and the Germans unveiled their heavier tanks with an 88 mm KwK36 cannon like the Tiger, War Office made a revision to their design requirements to counter this threat. The requirements now include an increased durability and reliability, with the ability to protect itself against the 88 mm gun and mines, an agility similar to the Comet tank and with good reverse speed, all while staying under a 40 ton weight.

Responding to these requirements, the department developed a larger hulls by adapting the suspension on the Comet, lengthening with another road wheel and spacing between the wheels. The standard Christie suspension used on the previous cruiser tanks was replaced by the Horstmann suspension, which uses coil springs on two-wheel bogies on each side and is proven to be easier to maintain than the Christie suspension. The hull used a welded and sloped armour with a cast turret mounting the famous 17-pounder cannon. The speed of the tank would be established by using the Rolls Meteor engine previously used on the Comet and Cromwell. Despite these changes, the department concluded that the weight restriction would not allow the tank design to withstand the 88 mm rounds. The weight restriction was done so the tank would be able to be carried around in the Mk.I and Mk.II transport trailers, which had a 40-ton load. This restriction was rescinded to allow more freedom in the tank design, which showed potential to War Ministry. The heavier tank designs developed had armour equivalent to the heaviest infantry tanks like the Churchill tank, yet with superior cross-country mobility due to improved suspension and engines.

The tank was given the name Centurion and the first mock-ups of the design was made by AEC and was presented in May 1944. After that, 20 pilot models were ordered with a various armament combinations. Ten had a 17-pounder and a 20 mm Polsten gun (5 with a machine gun in turret rear, 5 with an escape door instead), five had a 17-pounder and a BESA machine gun and an escape door, five more with the 77 mm HV gun with a driver operated hull machine gun. The prototypes of the 40-ton design, the Mk.1, had a 76 mm armour on the front glacis, which was made very powerful with the heavy sloping design on the tank. Added with a 152 mm thick turret armour, the Centurion became a very protected tank design, yet it was also very agile, outperforming the Comet tank in tests. The next Centurion model, Mk.2, featured a much thicker 118 mm front glacis armour and a thicker side armour. Production began for the Centurion Mk.2 in November 1945 for 800 tanks from Leyland Motors, Royal Ordnance Factories, and Vickers. The Mk.2 was put into service in the 5th Royal Tank Regiment in December 1946.

After the Centurion Mk.2 was put into service, Royal Ordnance developed the successor to the 17-pounder, the 84 mm 20-pounder. With this, the Centurion went through another upgrade to mount the 20-pounder. The 20 mm Polsten gun was removed and replaced by a BESA gun due to its questionable utility. The new upgrade, now the Centurion Mk 3, also featured an automatic stabilization system that improved firing accuracy while on the move. The tank was first produced in 1948 and overtook the previous Mk.1 and Mk.2 in service. However, the 20-pounder also did not stay in service for long and were replaced by the more powerful 105 mm L7 gun from Royal Ordnance Factories. All Centurions versions after Mark 5/2 used the L7 gun, including the Centurion Mk 10, which also featured additional armour with the new gun.

Swedish import

Sweden, a neutral power during World War II, analyzed the progress of technology and concluded they needed a replacement tank for their armoured forces. The Swedish Armed Forces right after World War II in 1945 decided that the most suitable tank for the upcoming years of the Cold War was the Centurion tank. A request was sent for the purchase of the vehicles, but Britain affirmed that their needs must be met before any exports of the Centurion tank could be made. Not eager to wait long for their tanks, Sweden started development in 1951 to create their own tank, designated "Emil", as well as seek out the AMX-13 light tank from France. However the wait ended abruptly when Britain started to export the Centurion in 1952, and Sweden swooped up an order of 80 Centurion Mk 3 in 1952, with the first delivery arriving in April 1953. The Swedish designated the adopted Centurion Mk 3 tank as the Stridsvagn 81. In 1955, Sweden imported another batch of Centurion, 160 Mk 5 variants, and employed them in the same designation as well. In the 1960, Sweden bought another batch of Mk 10 tanks that were accepted as the Stridsvagn 101. During the years in service, the Strv 81 and 101 were upgraded with newer equipments, modules, and armaments, as well as changing the designation to signal the improvements. There were also tests such as the inclusion of SS.11 missile on the turret side to improve the firepower of the Centurions.

The Centurion Stridsvagn series served alongside the domestic Strv 103 design as the primary vehicle of the Swedish armoured forces. In 1990s, the Swedish military started to phase out the two tanks as they modernized their forces. After a series of tests between the Russian T-72, American M1 Abrams, and German Leopard 2, the Swedish military replaced their outdated armoured fleet with the Leopard 2, designated the Stridsvagn 121.

Media

Skins
Videos

See also

Main article: Centurion (Family)
Vehicles equipped with the same chassis
Related Development
Other vehicles of similar configuration and role

External links

Paste links to sources and external resources, such as:

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


Department of Tank Design
Medium Tanks 
Sherman Firefly  Sherman Firefly · Sherman IC "Trzyniec"
MBTs 
Centurion  Centurion Mk 1 · Centurion Mk.2 · Centurion Mk 3 · Centurion Action X · Centurion Mk.5 AVRE · Centurion Mk 10
Challenger*  Challenger Mk.2 · Challenger Mk.3 · Challenger DS
Tank Destroyers 
Achilles  Achilles · Achilles (65 Rg.)
Centurion-based  Conway · FV4005
Export 
Sherman Firefly  Sherman Ic · ▄Sherman Vc
Centurion  Centurion Mk.5/1 · Strv 81 · Strv 81 (RB 52) · ▄Strv 81 (RB 52) · Strv 101 · Strv 104** · Strv 105** · Sho't
See also  US Ordnance Department · Israeli Ordnance Corps · Vickers-Armstrongs Limited
  *By successor, the Military Vehicles and Engineering Establishment
  **Swedish modernizations incorporating innovations from the Israeli Sho't Kals.

Sweden medium tanks
Strv m/42  Lago I · Strv m/42 EH · Ikv 73 · Strv m/42 DT · Pvkv IV
Centurion derivatives  Strv 81 · Strv 81 (RB 52) · Strv 101 · Strv 104 · Strv 105
Strv 103  Strv 103-0 · Strv 103A · Strv 103С
Strv 121/122  Strv 121 · Christian II · Strv 122A · Strv 122B PLSS · Strv 122B+
Other  Sherman III/IV · T 80 U
Finland 
WWII  ▄T-28 · ▄T-34 · ▄Pz.IV · ▄T-34-85
Post War  ▄Comet I · ▄Charioteer Mk VII · ▄T-54 · ▄T-55M · ▄T-72M1 · ▄Leopard 2A4 · ▄Leopard 2A6
Norway  Leopard 1A5NO2

Sweden premium ground vehicles
Light tanks  ▄T-26E · Strv m/39 · Pbil m/40 · Strv m/41 S-I · CV9035DK · CV 90105
Medium tanks  Sherman III/IV · Strv 81 (RB 52) · Strv 103-0 · Leopard 1A5NO2 · Christian II
Heavy tanks  ▄KV-1 m1942 · Kungstiger
Tank destroyers  Ikv 73 · SAV 20.12.48 · VIDAR