{{Specs-Card|code=sw_strv_81}}

== Description ==

[[File:GarageImage_{{PAGENAME}}.jpg|420px|thumb|left]]
{{Break}}
The '''{{Specs|name}}''' is a rank {{Specs|rank}} Swedish medium tank {{Battle-rating}}. It was introduced in [[Update 1.97 "Viking Fury"]].

== General info ==
=== Survivability and armour ===

'''Armour type:'''

* Rolled homogeneous armour (Hull, Turret roof)
* Cast homogeneous armour (Turret)

{| class="wikitable"
!Armour
!Front
!Sides
!Roof
|-
|Hull
|76.2 mm (58°) ''Front glacis''
76.2 mm (47-48°) ''Lower glacis''
|50.8 (12°) + 6 mm
|29 mm
8-14 mm ''Engine deck''
|-
|Turret
|152 mm (6-27°) ''Turret front''
152 mm ''Gun mantlet''
|89 mm (5-12°)
|50.8 mm ''Border of turret''
29 mm ''Center of turret''
|-
!Armour
!Front
!Sides and Rear
!
|-
|Cupola
|152 mm
|90 mm
|-
|}

=== Mobility ===
''Write about the mobility of the ground vehicle. Estimate the specific power and manoeuvrability, as well as the maximum speed forwards and backwards.''

{{tankMobility|abMinHp= 1007|rbMinHp= 575|AoAweight=|abForwardSpeed=39}}

== Armaments ==
=== Main armament ===

{{main|Kan Strv 81 (84 mm)}}

{| class="wikitable" style="text-align:center" width="100%"
|-
! colspan="5" | [[Kan Strv 81 (84 mm)|84 mm Kan Strv 81]] || colspan="5" | Turret rotation speed (°/s) || colspan="4" | Reloading rate (seconds)
|-
! Mode !! Capacity !! Vertical !! Horizontal !! Stabilizer
! Stock !! Upgraded !! Full !! Expert !! Aced
! Stock !! Full !! Expert !! Aced
|-
! ''Arcade''
| rowspan="2" | 65 || rowspan="2" | -10°/+20° || rowspan="2" | ±180° || rowspan="2" | Two-plane || 19.0 || __._ || __._ || __._ || __._ || rowspan="2" | 8.1 || rowspan="2" | _._ || rowspan="2" | _._ || rowspan="2" | _._
|-
! ''Realistic''
| 11.9 || __._ || __._ || __._ || __._
|-
|}

==== Ammunition ====
{| class="wikitable sortable" style="text-align:center" width="100%"
! colspan="8" | Penetration statistics
|-
! rowspan="2" data-sort-type="text" | Ammunition
! rowspan="2" | Type of warhead
! colspan="6" | '''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
|-
|}
{| class="wikitable sortable" style="text-align:center" width="100%"
! colspan="10" | Shell details
|-
! rowspan="2" data-sort-type="text" | Ammunition
! rowspan="2" | Type of warhead
! rowspan="2" | Velocity (m/s)
! rowspan="2" | Projectile Mass (kg)
! rowspan="2" | Fuse delay (m)
! rowspan="2" | Fuse sensitivity (mm)
! rowspan="2" | Explosive Mass (TNT equivalent) (g)
! colspan="3" | Ricochet
|-
! 0% !! 50% !! 100%
|-
| slpprj || APCBC || 1,000 || 9.1 || N/A || N/A || N/A || 48° || 63° || 71°
|-
| slpprj m/54 || APDS || 1,400 || 3.2 || N/A || N/A || N/A || 75° || 78° || 80°
|-
| slsgr m/53 || HE || 600 || 7.5 || 0.4 || 0.5 || 1,130 || 79° || 80° || 81°
|-
|}
{| class="wikitable sortable" style="text-align:center"
! colspan="7" | 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]] ====

{| class="wikitable" style="text-align:center"
|-
! Full ammo
! 1st rack empty
! 2nd rack empty
! 3rd rack empty
! 4th rack empty
! 5th rack empty
! 6th rack empty
! Visual discrepancy
|-
| '''65''' || 59 ''(+6)'' || 57 ''(+8)'' || 55 ''(+10)'' || 53 ''(+12)'' || 33 ''(+32)'' || 17 ''(+48)'' || yes
|-
|}

==== [[Optics]] ====
{| class="wikitable" style="text-align:center"
! colspan="3" | {{PAGENAME}} Optics
|-
!
! Default magnification
! Maximum magnification
|-
! Main Gun optics
| X4.9 || X6.0
|-
! Comparable optics
| colspan="2" | ___
|-
|}

=== Machine guns ===

{{main|Ksp m/39B (8 mm)}}

{| class="wikitable" style="text-align:center"
|-
! colspan="5" | [[Ksp m/39B (8 mm)|8 mm Ksp m/39B]]
|-
! Mount
! Capacity (Belt capacity)
! Rate of fire (shots/minute)
! Vertical guidance
! Horizontal guidance
|-
| Coaxial || 3,600 (250) || 648 || N/A || N/A
|-
|}

== Usage in battles ==

The Strv 81 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 (22mph)) 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 such a 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 (dangerous tank / faced towards you) 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 your opponent. If an enemy is spotted who is exposing their side or even the rear while not aiming towards you, 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 your prey by shooting all crew members or if you feel lucky shoot an ammo rack.

The best choice to pierce enemy tanks is obviously the slpprj m/54 (APDS) although it is quite expensive in terms of Silver Lions. The slpprj (APCBC) works in most situation as well but lacks penetration compared to the slpprj m/54 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 2000 m. T-44s and Panther IIs front plates can be penetrated to ranges up to almost 1000 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.

In a head to head situation with an enemy tank approaching try to angle the centurion not more than 5° degrees to either side since the side armour is quite weak (50.8 mm), try to hide your 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.

=== Modules ===
{| class="wikitable"
! Tier
! colspan="2" | Mobility
! Protection
! colspan="2" | Firepower
|-
| I
| Tracks
|
| Parts
| Horizontal Drive
|
|-
| II
| Suspension
| Brake System
| FPE
| Adjustment of Fire
| slpprj m/54
|-
| III
| Filters
|
| Crew Replenishment
| Elevation Mechanism
| Smoke grenade
|-
| IV
| Transmission
| Engine
|
| Artillery Support
| rökgr m/53
|-
|}

=== Pros and cons ===


'''Pros:'''

* Powerful and high penetrating gun, stock round is adequate and APDS can punch through anything it will face.
* Has a base reload time of 8.1 seconds, which can be lowered further into around 7.4 seconds (which is on average 2 seconds faster than its competitors).
* Excellent gun depression and elevation.
* Extremely strong gun mantlet.
* Somewhat bouncy armour.
* Gunner is on the right side of the tank.
* Neutral steering, can turn on the spot without having to switch into gear 1.
* Good maneuverability.
* Good reverse speed.
* Gun stabilizer.

'''Cons:'''

* Low top speed.
* Ammo rack in the front, penetration through the lower glacis will likely ends up destroying or detonating the ammo rack.
* Top armor covering the engine compartments is 8mm
* APDS shot causes only punctual damage (aim carefully).
* No explosive filler on any AP shells.
* Weak side armour, do not angle the hull to much.
* High repair cost

== History ==
''Describe the history of the creation and combat usage of the vehicle in more detail than in the introduction. If the historical reference turns out to be too long, take it to a separate article, taking a link to the article about the vehicle and adding a block "/History" (example: <nowiki>https://wiki.warthunder.com/(Vehicle-name)/History</nowiki>) and add a link to it here using the <code>main</code> template. Be sure to reference text and sources by using <code><nowiki><ref></ref></nowiki></code>, as well as adding them at the end of the article with <code><nowiki><references /></nowiki></code>. This section may also include the vehicle's dev blog entry (if applicable) and the in-game encyclopedia description (under <code><nowiki>=== In-game description ===</nowiki></code>, also if applicable).''

== Media ==
''Excellent additions to the article would be video guides, screenshots from the game, and photos.''

== See also ==
''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.''

== External links ==
''Paste links to sources and external resources, such as:''

* ''topic on the official game forum;''
* ''encyclopedia page on the tank;''
* ''other literature.''

{{Sweden medium tanks}}

Cromwell V

2020-10-01T14:40:32Z

U106449679: /* Ammunition */

{{Specs-Card|code=uk_a27m_cromwell_5}}
{{About
| about = British medium tank '''{{PAGENAME}}'''
| usage = other uses
| link = Cromwell (Family)
}}

== Description ==

[[File:GarageImage_CromwellV.jpg|420px|thumb|left]]
{{break}}
The '''{{Specs|name}}''' (or just '''{{Specs|pseudonym}}''') is a Rank {{Specs|rank}} British medium tank {{Battle-rating}}. It was released along with the entire British tree line in [[Update 1.55 "Royal Armour"]]. An adequately armoured cruiser tank that is armed with a rather inadequate [[Ordnance QF Mk.V (75 mm)|75 mm cannon]] due to poor post-penetration performance. However, the Cromwell V's speed makes it a very good flag runner akin to the [[M18 GMC|M18 Hellcat]].

The Cromwell V, despite being a later and more modern version than the Mk I, has a slightly lower (3.0-3.3) BR than the [[Cromwell I|Mk.I]] and arrives first in the tech tree. This is due to its 75 mm gun, which offers less penetration than the [[Ordnance QF 6-pounder Mk.III (57 mm)|57 mm]] in the Mk. I, and thus makes many higher BR tanks effectively invulnerable to it. Those few points of BR make little the difference; in its match-ups the Cromwell V is an average opponent, but will easily outrun anything on the map to take up effective positions for the first shot, and then doling out some of the worst damage in the game at its BR from its 75 before running off to another location.

This tank is not a beginner-friendly vehicle. Though fast, the vehicle's gun does not provide reliable victories against enemy tanks. Skill is required to maximize the vehicle's speed, rectangular armour, and firepower against enemy vehicles with AP rounds with HE fillers. Excellent aim very important to get the job done.

== General info ==
=== Survivability and armour ===

'''Armour type:'''

* Rolled homogeneous armour
* Cast homogeneous armour (Gun mantlet)

{| class="wikitable"
|-
! Armour !! Front !! Sides !! Rear !! Roof
|-
| Hull || 63.5 mm (1°) ''Front plate'' 25.4 mm (71°) ''Front glacis'' 57 mm (18°) ''Joint plate'' 25.4 mm (65°) ''Lower glacis'' || 25.4 mm || 32 mm || 14 mm
|-
| Turret || 76.2 mm (1°) ''Turret front'' 63.5 (1°) ''Gun mantlet'' || 63.5 mm || 57.1 mm (1°) || 20 mm
|-
|}
'''Notes:'''

* Suspension wheels and tracks are 20 mm thick.

=== Mobility ===


{{tankMobility|abMinHp= 930|rbMinHp= 531}}

== Armaments ==
=== Main armament ===

{{main|Ordnance QF Mk.V (75 mm)}}
{| class="wikitable" style="text-align:center" width="100%"
|-
! colspan="5" | [[Ordnance QF Mk.V (75 mm)|75 mm OQF Mk.V]] || colspan="5" | Turret rotation speed (°/s) || colspan="4" | Reloading rate (seconds)
|-
! Mode !! Capacity !! Vertical !! Horizontal !! Stabilizer
! Stock !! Upgraded !! Full !! Expert !! Aced
! Stock !! Full !! Expert !! Aced
|-
! ''Arcade''
| rowspan="2" | 64 || rowspan="2" | -12°/+20° || rowspan="2" | ±180° || rowspan="2" | N/A || 23.8 || 32.94 || 40.00 || 44.24 || 47.06 || rowspan="2" | 6.5 || rowspan="2" | 5.75 || rowspan="2" | 5.3 || rowspan="2" | 5.0
|-
! ''Realistic''
| 14.88 || 17.50 || 21.25 || 23.50 || 25.00
|-
|}

===== Ammunition =====
{| class="wikitable sortable" style="text-align:center" width="100%"
! colspan="8" | Penetration statistics
|-
! rowspan="2" data-sort-type="text" | Ammunition
! rowspan="2" class="unsortable" | Type of warhead
! colspan="6" | '''Penetration''' '''''in mm''''' '''@ 90°'''
|-
! 10m
! 100m
! 500m
! 1000m
! 1500m
! 2000m
|-
| M72 shot || AP || 91 || 88 || 78 || 67 || 57 || 49
|-
| M48 shell || HE || 10 || 10 || 10 || 10 || 10 || 10
|-
| M61 shot || APCBC || 103 || 100 || 89 || 77 || 66 || 57
|-
|}
{| class="wikitable sortable" style="text-align:center" width="100%"
! colspan="11" | Shell details
|-
! rowspan="2" data-sort-type="text" | Ammunition
! rowspan="2" class="unsortable" | Type of warhead
! rowspan="2" |Velocity in m/s
! rowspan="2" |Projectile Mass in kg
! rowspan="2" | ''Fuse delay''
''in m:''
! rowspan="2" | ''Fuse sensitivity''
''in mm:''
! rowspan="2" | ''Explosive Mass in g (TNT equivalent):''
! rowspan="2" | ''Normalization At 30° from horizontal:''
! colspan="3" | ''Ricochet:''
|-
! 0%
! 50%
! 100%
|-
| M72 shot || AP || 619 || 6.3 || N/A || N/A || N/A || -1° || 47° || 60° || 65°
|-
| M48 shell || HE || 463 || 6.3 || 0.4 || 0.5 || 666 || +0° || 79° || 80° || 81°
|-
| M61 shot || APCBC || 618 || 6.53 || N/A || N/A || N/A || +4° || 48° || 63° || 71°
|-
|}

===== [[Ammo racks|Ammo racks]] =====
[[File:Ammoracks_CromwellV.png|right|thumbnail|x250px|[[Ammo racks|Ammo racks]] of the Cromwell V.]]
{| class="wikitable sortable" style="text-align:center"
|-
! class="wikitable unsortable" |Full ammo
! class="wikitable unsortable" |1st rack empty
! class="wikitable unsortable" |2nd rack empty
! class="wikitable unsortable" |3rd rack empty
! class="wikitable unsortable" |4th rack empty
! class="wikitable unsortable" |5th rack empty
! class="wikitable unsortable" |6th rack empty
! class="wikitable unsortable" |7th rack empty
! class="wikitable unsortable" |8th rack empty
! class="wikitable unsortable" |Visual discrepancy
|-
|| '''75''' || 66 ''(+9)'' || 56 ''(+19)'' || 46 ''(+29)'' || 37 ''(+38)'' || 28 ''(+47)'' || 19 ''(+56)'' || 10 ''(+65)'' || 1 ''(+74)'' || style="text-align:left" | no
|-
|}

===== Optics =====

{| class="wikitable" style="text-align:center" width="50%"
! colspan="3" | {{PAGENAME}} [[Optics]]
|-
! Which ones
! Default magnification
! Maximum magnification
|-
! Main Gun optics
| x1.85 || x3.5 
|-
! Comparable optics
| colspan="2;" style="text-align:center;" | [[Pz.III L]]
|-
|}

=== Machine guns ===

{{main|BESA (7.92 mm)}}

{| class="wikitable" style="text-align:center"
|-
! colspan="7" | [[BESA (7.92 mm)|7.92 mm BESA]]
|-
! colspan="7" | ''Coaxial mount''
|-
! colspan="4" rowspan="1" style="width:5em" |Capacity (Belt capacity)
! rowspan="1" | Fire rate (shots/minute)
! rowspan="1" | Vertical guidance
! rowspan="1" | Horizontal guidance
|-
| colspan="4" | 4,950 (225) || 600 || N/A || N/A
|-
|}

== Usage in battles ==

The Cromwell fighting prowess is due to its manoeuvrability and gun rotation. This is thanks to the combination of the Rover Meteor engine, essentially a Rolls-Royce Merlin of Spitfire fame with the supercharger removed, and its Merrit-Brown triple-differential transmission. This gives the Cromwell power even while it manoeuvres so it maintains speed much better than those tanks using traditional clutch-and-brake systems like practically everything in this BR. This not only allows it to spin in place and easily run around obstacles, but it can also out-climb almost every tank in the game, allowing it to go places the enemy might not expect to find you. But mostly this gives it unmatched speed, allowing you to reach the good sniping spots before anyone else in the match. But there is a down side to the Cromwells amazing speed, Going in reverse will only let you go up to 3KM/h, and rarely will you be able to damage a tank enough to get a similarly effective second shot; either the tanks was still drivable and retreated to cover, angled to best bounce your next shot, or 1 shot you in return with APHE.

Once upgraded, the Cromwell's turret rotation is one of the best for the rank, only beaten by the [[T-34 (1940)|T-34]] that has a rotation speed of 29°/s (fully aced crew). This allows an upgraded Cromwell to quickly engage targets in different angles, important for close-quarter fighting. German tanks will come close to you but not be able to catch up with you in some situations, but this being said; '''do not''' go into the hell of battle thinking "My turret rotation is fast enough to beat all of youse!" because that will get the Cromwell destroyed by a tank who only needs to hit your turret from the front to disable you. And as said before your reverse speed isn't that fast so if you are in this situation all you can do is pray and hope that your team mates come up to help you out or in worst case scenario you get taken out straight away from a side on hit. But instead help out the team from a distance of around 0-550m or if you feel like sniping from a distance your max range is 850m.

The downside to this tank is its thin hull armour, especially on the sides. Everything on the map can penetrate the Cromwell hull, even from the front. This includes SPAAs, who will easily tear the Cromwell apart, especially the [[Wirbelwind]] that will do so at almost all ranges typically encountered and any angle. The Cromwells turret is somewhat better off, with just over 60 mm on the front and sides, but the flat plates are easily penetrated by any type of shell. The closely packed interior means it's a one-hit-to-burn design for anything with a 75 mm, and at 3.3 BR these will be on almost all tanks you face. Keep moving! If you take a shot or get shot at, re-position, don't ever try to fight it out. You're so much faster and more manoeuvrable than anything you meet that you can almost always find a better location to go after any target. Just don't try to reverse; it's single reverse gear gets you 2 mph (3 km/h), meaning you're likely better off spinning in place and then driving away.
=== Modules ===
{| class="wikitable"
! Tier
! colspan="2" | Mobility
! Protection
! colspan="3" | Firepower
|-
| I
| Tracks
|
| Parts
| Horizontal Drive
|
|
|-
| II
| Suspension
| Brake System
| FPE
| Adjustment of fire
| M61 Shot
|
|-
| III
| Filters
|
| Crew Replenishment
| Elevation Mechanism
|
|
|-
| IV
| Transmission
| Engine
|
| Artillery Support
| M89
| Smoke grenade
|-
|}
=== Pros and cons ===

'''Pros:'''

* Excellent gun depression of -12°.
* Very fast acceleration.
* Very sensitive brakes enables Cromwell to land shots almost immediately after stopping.
* Decent front turret armour of 64 mm.
* Exceptional speed for a medium tank.
* Acceptable reload for 75 mm gun that allows a steady rate of fire.
* Solid shot produces cone of shrapnel in post-penetration line of fire.
* Armour can be compounded angled to the sides for extra effectiveness.
* Very good flanker and rushing caps at early game.
* Able to neutral steering.
* Performs exceptionally well when working with other allied tanks with different role.
* Excellent maneuverability.
* Standard 5 crew members allow a margin of crew casualties before a decrease in combat performance.
* Low profile.
* Excellent climbing ability (both in reverse and forwards).
* Still gains speed while climbing even the steepest of slopes.
* Great turret rotation for a Rank 2 medium tank (beaten only by the T-34).

'''Cons:'''

* Solid shot post-penetration damage still mediocre, with emphasis in precise targeting of critical modules and crew on the first shot.
* Only solid shot ammunition for armour-piercing shells
* 75 mm gun only average in anti-tank capabilities.
* The sensitive brakes can throw aim off in the instance, letting a prepared enemy fire first.
* Armour is only supported by raw thickness due to its flat, boxy construction. Requires manual compound angling to improve effectiveness.
* Using the Cromwell for frontal engagements is not advised, should use flanking tactics instead and let heavier allies like the Matildas and Churchills to take frontal assault.
* Weak side armour.
* Ammunition racks litter all around the hull center.
* Prone to fishtailing or breaking out, A and D keys can be merely tapped, effectively uncontrollable at high speeds.
* Very poor reverse speed, just 3 km/h (1.8 mph).
* Unlockable M61 APCBC shell with acceptable ricochet characteristics loses extra penetration the stock M72 shell has.
* Lacks any sort of gun stabilization
* Gun elevation speed is extremely poor
* Neutral steering only works on flat terrain

== History ==

===Development===
Development for the tank started back in 1940, just around the time the [[Crusader Mk II|Crusader cruiser tank]] was being put into service in the British Army. The development of a stronger cruiser tank was initiated due to the belief that that the Crusader would become obsolete in the face of more advanced German tanks as the time pass. The initial plans was for the tank to mount the OQF 6-pounder gun and was to be completed in 1942. The project was taken up by three companies who submitted their designs. Vauxhall developed the ''A23'', a scaled down [[Churchill Mk III|Churchill tank]] with 75 mm of armour and a 12-cylinder Bedford engine. Nuffield developed the ''A24'' based off the Crusader that was powered by the Liberty engine and had an advantage of being put into production quickly. Leyland and Birmingham Railway Carriage & Wagon developed a design that was similar to Nuffield's, but with different suspension and track designs. All these designs were examined in January 1941 and it was decided that Nuffield's A24 would become the vehicle of choice for the project. Six prototypes of the vehicle, now called ''Cromwell I'' were ordered for delivery in the Spring of 1942, but arrived four months late, with current events making the tank designs outdated. Despite that, the tank was put into production and experienced an unsatisfactory performance history as being an under-powered tank. The lack of available tanks led to the demands for more 6-pounders on the battlefield, which were used to be mounted on the older tank designs.

When Britain entered the war, Rolls-Royce stopped producing cars and set up a team to find ways to use their production lines. The team was made under Roy Robotham at Clan Foundry near the city of Belper. Meeting with Henry Spurrier of Leyland, they talked tank designs and a project began of fitting a Rolls-Royce Merlin engine onto a tank. A Leyland-built Crusader was used for the test, removing the supercharger from the engine before installing it in the tank. The result was an absurdly fast tank, able to reach a speed of 80 km/h, estimated since timing the speed runs was difficult. The impressive performance had Leyland organize a production for 1,000 units of the engine, renamed as the ''Meteor''. This plan was changed after concerns of the engine's cooling was raised, Leyland decides to produce their own version of Meteor which was weaker (350 hp) compared to the Rolls design (500 hp). Thus, the Tank Board decided to just order the engine straight from Rolls-Royce for the Meteor engine. The A24 tank design with the Meteor engine was redesignated as the A27. During the development, Leyland suggested that the tank should be made to fit both the Meteor and the American-designed Liberty engine, thus the designation expanded to A27M (Meteor) and the A27L (Liberty) and were called ''Cromwell III'' and ''Cromwell II'' respectively. Leyland's attempt at building their own engine was abandoned. The A27M tank was made into a prototype and delivered on January 1942, it proved extremely mobile with its 600 hp engine and orders were placed for both engine versions. This proved difficult due to production difficulties with the Meteor and soon Leyland took over production of both versions. Production lines for the Meteor engine continued to be strained until late 1942, where Ernest Hives of Rolls met with Spencer Wilks of the company Rover made a deal in January 1943 to exchange factories, with Rolls establishing a Meteor engine factory at Barnoldswick, Lancashire.

Production of the tank began in November 1942 with new names given out the the tanks. The original A24 Cromwell I from Nuffield was renamed the ''Cavalier'', the Liberty powered Cromwell II became the ''Centaur'', and the Meteor powered Cromwell III retained the name as the '''Cromwell'''. The actual Cromwell tank production was delayed until January 1943 due to low supply of Meteor engines until the Rover factory began producing it. With more Meteor engines being produced, the Centaur tanks were often converted to use the Meteor engine, turning them into Cromwells. Field tests with the tanks took place in August to September in 1943 alongside the [[M4A2|M4A2]] and M4A4 Shermans. The tests proved the Shermans to be more reliable than the Cromwell and Centaurs, needing only about 0.03 hours of mechanical attention every mile compared to the Cromwell's 0.07 hours per mile and the Centaur's 0.08 hours per mile. The two tanks were thus given time to iron out these deficiencies, the Cromwell suffered from oil leaks along with brake and clutch failures. While the tank suffered from these defects, the crews expressed their satisfaction of the designs for their speed and handling, but the Centaur was not given the same attention as the Cromwell. A second test in November had the Cromwell perform with improved results while the Centaur was still experiencing the same problems. The production model was finalized on February 2, 1944 after a specifications for a "Battle Cromwell" came in from Leyland, which included some design changes, an increase of 6 mm on the bottom of the tank, seam welding the joints, and the standard usage of the Meteor engine and the Merritt Brown transmission. The Centaur was relegated to training roles or modified for specialist roles such as anti-aircraft guns or engineering vehicles. Total production for the A27 tank series is 4,016 tanks, of which 950 are Centaurs and 3,066 are Cromwells.

===Design===
The Cromwell's frame used a riveted construction in its initial production models, but this later changed to welding. The frame was strengthened with bolted armour plates. Companies involved in the A27 production were LMS Railway, Morris Motors, Metro-Cammell, Birmingham Railway Carriage & Wagon Company, and English Electric. Some of these models were not consistent in construction, such as some variants built with 360 mm wide tracks and some with 393 mm tracks. Suspension was the Christie suspension derived from the earlier cruiser tank designs. Four of the tanks's road wheels have shock absorbers, and no return rollers are available, the tracks are supported on the top of the large road wheels. The gearbox has five forward and one reverse gear, with the first forward gear made for confined areas and sharp turns. While the Meteor engine is capable of going faster, it is restricted to 540 hp output with a governor to avoid straining the engine and suspension. The Cromwell's armaments changed over a few times, it's initial model [[Cromwell I|mounted the 6-pounder gun]], but the later models mounted the 75 mm gun. The adaption was easy due to the 75 mm gun being a 6-pounder bored for the larger caliber. A 7.92 mm BESA machine gun was available for coaxial firing on the turret. The armour on the Cromwell started as a 76 mm plate, which increased gradually to 83 mm and 100 mm over time for additional protection.

The '''A27M Cromwell V''' was Cromwell variant that used the 75 mm gun and a welded construction, no riveting was used in the frame.

===Combat usage===
The British, at the time of Operation Overlord, primarily service the [[M4|M4 Sherman]] as the main tank of their armoured units, only the armoured brigades of the 7th Armoured Division were equipped with the Cromwell tanks. Although the Cromwell also saw use as armoured reconnaissance regiments in other British divisions such as the Guards Armoured Division and the 11th Armoured Division. Compared to the Sherman, the Cromwell was much faster, so fast that it earned the title as the fastest British tank in World War II. The Cromwell also presented a smaller profile, making it a lower target, and has a thicker frontal armour plate. However, the Cromwell's armour was not sloping, was not as reliable in comparison to the Sherman, and a slightly smaller crew space inside the tank. Nevertheless, the Cromwell proved very mobile and effective on the battlefield alongside the Sherman, often outflanking German armour with their superior speed to hit the tanks on their sides or rear. Since the Cromwells are not able to mount the larger and more powerful 17-pounder and a derivative, the [[Challenger|A30 Challenger]], met with production issues, Cromwell units were equipped with [[Sherman Firefly|Sherman Fireflies]] in order to supplement the firepower of the 17-pounder. Later in the war, these units began to be succeeded by the [[Comet I|Comet tank]] which had more armour and a more powerful 77 mm gun derived from the 17-pounder.

During the war, the Cromwell chassis was used in various specialized roles on the battlefield. The ''A30 Challenger'' is a tank design that attempted to mount the 17-pounder on a lengthened Cromwell chassis, the ''[[Avenger|A30 SP Avenger]]'' was another attempt to equip the 17-pounder, but used a lighter turret instead. Some were made into observation posts or command tanks. The Centaur saw a wider conversion with some becoming engineering vehicles, armoured recovery vehicles, and armoured personnel carriers. After the war, the British attempted to up-gun the Cromwell into the ''[[Charioteer Mk VII|Charioteer]]'', which was designed in the 1950s to supplement tank units before the [[Centurion Mk 3|Centurion]] was mass-issued.

The Cromwells were also given out to Allied units such as the 1st Polish Armoured Division and the 1st Czechoslovak Armoured Brigade. These units served in the northern Europe with the Allies as they breakthrough deeper into Europe. After World War II, some Cromwell stayed in service and saw service in the Korean War with the 7th Royal Tank Regiment and the 8th King's Royal Irish Hussars. The Cromwells also were given to Greece, where it had the distinction of being the first tank put into service by the Greek Army. 52 Centaurs were given to Greece in 1946 to fight in the Greek Civil War, but these were stored due to lack of crews with adequate training. Formal training began in Greece began in 1947 with the return of trained officers from Britain. The Centaur saw limited service in the Greek Armoured Corps, fighting in the Greek mountains. These units kept the Centaurs up until 1963 where it was replaced by the American [[M47|M47 Pattons]].

== Media ==
''An excellent addition to the article will be video guides, as well as screenshots from the game and photos.''

==References==
<references />

== Read also ==
''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;''
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''ETC.''

== Sources ==
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* ''topic on the official game forum;''
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{{Britain medium tanks}}