Mark VIII A27M Cromwell I

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General info

The Cromwell I in the garage.

The Mark VIII A27M Cromwell I (or just Cromwell I) is a Rank II British medium tank with a battle rating of 3.7. It was released along with the initial British tree line in Update 1.55 "Royal Armour".

The main purpose, usage and tactics recommendations

General play style

The Cromwell I is one of the fastest tanks in the game, due to its Meteor engine derived from the famous Rolls-Royce Merlin of Spitfire fame. It can outrun almost every other tank, including most low-tier light tanks like the BT series or M3, but has adequate armour for a medium tank and a reasonable gun. Generally speaking it can easily outfight most tanks that can keep up with it, and outrun anything that is a serious threat. Just don't sit still; anyone can snipe if you give them a chance, and the Cromwell's armour makes it a one-hit wonder.

Vehicle characteristics

The Mk. I uses the 6-pdr, which provides higher penetration than the 75mm on the Mk. V. It is also slightly faster and more maneuverable, thanks to the addition of an engine governor on the Mk. V that lowered its maximum output. However, these advantages are offset by the higher BR which means you will be facing some tanks that are a good match for the Cromwell in terms of speed, like the M18, and some tanks that are largely invulnerable, like the KV-2.

Tactics

The Cromwell excels in flanking attacks, especially on larger maps where it has room to maneuver. Circling around the enemy will almost always provide some excellent sniping encounters, just be sure to take out the gunners and then immobilize the target so they cannot simply drive to safety. It can also climb like a mountain goat, allowing it to position in areas where tanks simply won't expect you.

Specific enemies worth noting

Counter-tactics

Pros and cons

Pros:

  • Very fast for a medium tank.
  • 57 mm is a good gun in dealing with many vehicles that it may face.
  • Above 2 combined make it excellent for seizing zones and destroying the lighter tanks from other nations that are usually the first there.
  • With judicious use you can often end up with the most formidable tank in a lower tiered game.
  • Can easily hide behind obstacles and surprise passing enemies with a flanking manoeuver.
  • If played correctly, it can outflank and destroy even higher ranking tanks.
  • Has a speed of 71 km/h on flat terrain.

Cons:

  • Terrible reverse speed.
  • Not well armoured when uptiered and the 57 mm gun is marginal.
  • Sensitive steering in forward gears; very prone to fishtailing and spinning out.
  • Boxy, vertical armour on hull and turret makes angling critical.
  • 57 mm struggles to penetrate sloped or angled (or both) armour. T-34s and KV-1s are an issue at this rank as they are very difficult to penetrate at long range.

Specifications

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Armaments

1 x 57 mm QF 6-pounder Mk.III cannon (75 Rounds)
1 x 7.92 mm BESA machine gun (4,950 Rounds)

Main armament

1 x 57 mm QF 6-pounder Mk.III cannon
  • Ammunition Capacity: 75 Shells
  • Gun Depression: -12°
  • Gun Elevation: 20°
  • Turret Rotation Speed: 14.9°/s (Stock), 20.6°/s (Upgraded), __._°/s (Prior + Full Crew), __._°/s (Prior + Expert Qualif.), __._°/s (Prior + Ace Qualif.)
  • Reloading Rate: 5.2s (Stock), __._s (Full Crew), __._s (Prior + Expert Qualif.), __._s (Prior + Ace Qualif.)
1 x 57 mm QF 6-pounder Mk.III cannon
  • Ammunition Capacity: 75 Shells
  • Gun Depression: -12°
  • Gun Elevation: 20°
  • Turret Rotation Speed: 14.9°/s (Stock), 17.5°/s (Upgraded), __._°/s (Prior + Full Crew), __._°/s (Prior + Expert Qualif.), __._°/s (Prior + Ace Qualif.)
  • Reloading Rate: 5.2s (Stock), __._s (Full Crew), __._s (Prior + Expert Qualif.), __._s (Prior + Ace Qualif.)
1 x 57 mm QF 6-pounder Mk.III cannon
  • Ammunition Capacity: 75 Shells
  • Gun Depression: -12°
  • Gun Elevation: 20°
  • Turret Rotation Speed: 14.9°/s (Stock), 17.5°/s (Upgraded), __._°/s (Prior + Full Crew), __._°/s (Prior + Expert Qualif.), __._°/s (Prior + Ace Qualif.)
  • Reloading Rate: 5.2s (Stock), __._s (Full Crew), __._s (Prior + Expert Qualif.), __._s (Prior + Ace Qualif.)
Ammunition
Ammunition Penetration in mm @ 90° Type of
warhead
Velocity
in m/s
Projectile
Mass in kg
Fuse delay
in m:
Fuse sensitivity
in mm:
Explosive Mass in
TNT equivalent
in g:
Normalization At 30°
from horizontal:
Ricochet:
10m 100m 500m 1000m 1500m 2000m 0% 50% 100%
Shot Mk.5 101 100 83 67 51 45 AP 807 2.8 N/A N/A N/A -1° 43° 30° 25°
Shell Mk.10 4 4 4 4 4 4 HE 807 3.0 0.1 0.1 153 +0° 11° 10°
Shot Mk.5 HV 112 111 92 74 57 50 AP 853 2.8 N/A N/A N/A -1° 43° 30° 25°
Shot Mk.8 94 92 83 72 63 52 APC 853 2.9 N/A N/A N/A -1° 42° 27° 19°
Shot Mk.9 113 112 100 90 84 80 APCBC 801 3.2 N/A N/A N/A +4° 42° 27° 19°
Ammo racks
Ammo racks of the Cromwell V (identical).
Full
ammo
1st
rack empty
2nd
rack empty
3rd
rack empty
4th
rack empty
5th
rack empty
6th
rack empty
7th
rack empty
8th
rack empty
Recommendations Visual
discrepancy
75 66 (+9) 56 (+19) 46 (+29) 37 (+38) 28 (+47) 19 (+56) 10 (+65) (+74) Turret empty:  () no

Secondary armament

1 x 7.92 mm BESA machine gun (coaxial)

Crew

  • Commander
  • Gunner
  • Loader
  • Driver
  • Assistant Driver

Total: 5 Crew members

Armour

Armour type:

  • Rolled homogeneous armour
  • Cast homogeneous armour (Gun mantlet, Driver's port)
Armour Front Sides Rear Roof
Hull 63.5 mm Front plate
25.4 mm (74°) Front glacis
57 mm (13°) Joint plate
25.4 mm (68°) Lower glacis
25.4 mm 32 mm (0-7°) Top
20 mm (47°) Bottom
14 mm
Turret 76.2 mm Turret front
63.5 mm Gun mantlet
63.5 mm 57.1 mm 20 mm

Notes:

  • Suspension wheels and tracks are 20 mm thick.

Engine & mobility

Weight: 27.0 ton

Max Speed: 72 km/h
Stock

  • Engine Power: 930 hp @ 2550 rpm
  • Power-to-Weight Ratio: 34.44 hp/ton
  • Maximum Inclination: 40°

Upgraded

  • Engine Power: 1145 hp @ 2550 rpm
  • Power-to-Weight Ratio: 42.407 hp/ton
  • Maximum Inclination: 43°
Weight: 28.0 ton

Max Speed: 64 km/h
Stock

  • Engine Power: 531 hp @ 2550 rpm
  • Power-to-Weight Ratio: 19.67 hp/ton
  • Maximum Inclination: 40°

Upgraded

  • Engine Power: 600 hp @ 2550 rpm
  • Power-to-Weight Ratio: 22.22 hp/ton
  • Maximum Inclination: 41°
Weight: 28.0 ton

Max Speed: 64 km/h
Stock

  • Engine Power: 531 hp @ 2550 rpm
  • Power-to-Weight Ratio: 19.67 hp/ton
  • Maximum Inclination: 40°

Upgraded

  • Engine Power: 600 hp @ 2550 rpm
  • Power-to-Weight Ratio: 22.22 hp/ton
  • Maximum Inclination: 41°

Modules and improvements

As per usual,"Parts" and "FPE" should be the focus first for modifications to increase combat survivability. Everything else is fair game after you get those two. __MODIFICATIONS__

History of creation and combat usage

Development

Development for the tank started back in 1940, just around the time the 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 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 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 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 I was exactly the same as Centaur I, with the biggest difference being that it was powered with a Meteor engine. It featured a 6-pounder as its main armament, but only a few were produced before the Cromwell changed armament to the 75 mm gun

Combat Usage

The British, at the time of Operation Overlord, primarily service the 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 A30 Challenger, met with production issues, Cromwell units were equipped with 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 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 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, which was designed in the 1950s to supplement tank units before the 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 Pattons.

Screenshots and fan art

Skins and camouflages for the _____ from live.warthunder.com.

Additional information (links)

[Devblog] Cromwell I
Official War Thunder forum article: [Vehicle Profile] Cromwell Mk I

References


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uk_a27m_cromwell_1.png

Icon-country-gbr.png Cromwell I
Nation Britain ground vehicle
Type Britain medium tank
Rank 2
Battle Rating 3.7

   Metric✓       Imperial   

   Metric       Imperial✓   

Characteristics
Weight
??,?00 kg
??,??? lb
Number of Crew ?
Hull armour thickness
??/?.0/?0/?.0 mm
?.??/0.???/0.???/0.??? inches
Statistics
Engine power (stock)
??? hp
??? hp
??? hp
Engine power (upgraded)
??? hp
??? hp
??? hp
HP/ton ratio (stock)
??.??
??.??
??.??
??.??
??.??
??.??
HP/ton ratio (Upgraded)
??.??
??.??
??.??
??.??
??.??
??.??
Max speed
?? km/h
?? mph
?? km/h
?? mph
?? km/h
?? mph
Main Weapon
? Cannon
Ammo stowage ?? rounds
Vertical guidance -?°/??°
Horizontal guidance -??°/??°
Secondary Weapon
? Machine gun
Ammo stowage ?,000 rounds
Mount Pintle mount
Vertical guidance -??°/??°
Horizontal guidance -??°/??°
Economy
Required RP N/A
Vehicle cost N/A
Crew training cost ?,?00 SL
Max repair cost*
?,??0 SL
?,??0 SL
?,??0 SL
Free repair time (Stock)
2h 04m
8h 20m
8h 21m
Free repair time (Upgraded)
41m
2h 46m
2h 47m
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