Mark VIII A27M Cromwell RP-3

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Arcade Realistic Simulator

Arcade Realistic Simulator

Arcade Realistic Simulator

General info

The Cromwell RP-3 in the garage.

The Cromwell RP-3 is a Rank II British medium tank with a battle rating of 3.3. It was introduced in Update 1.59 "Flaming Arrows". Equipped with four 152 mm RP-3 rockets with a relatively straight trajectory, the Cromwell RP-3 could be played with more precision than its other rocket-bearing contemporaries like the T34 Calliope.

The main purpose, usage and tactics recommendations

General play style

The Cromwell RP-3 is very similar to the Cromwell V in terms of armour, mobility, and armament. The 75 mm gun can help do damage to tanks of the same class like the Panzer IV, using its speed to get to an angle to hit the weaker points of the enemy tanks. However, the Cromwell RP-3 is equipped with four rockets on the turret. Unlike its contemporaries, which often has the rockets on racks above the turret, the rocket integrated on the turret allows for better aiming with the rockets in-game than the others. In the range of around 500 meters, the rockets can be aimed by use of the gun's aiming sight. Though practice is needed to get the feel of the rocket's landing point, this is a lot better than simply lobbing rockets after rockets in hope that one will hit.

Vehicle characteristics

Tactics

The Cromwell RP-3 should not fight tanks in a head-on battle due to the relatively unsloped frontal armour. As such, the mobility of the Cromwell should be exploited to get to the blind spots of an enemy tank and fire at them from there with the 75 mm gun or the rockets.

Specific enemies worth noting

Counter-tactics

When encountering the Cromwell, always make it a priority target - other than T-34s - if there is one thing that could match it on equal terms, it would be the Cromwell, being just as great of a threat with those rockets. Try firing at a flat part of the armour if the Cromwell is not angled - fire at the hull. When angled, hold it off or remain in cover until you and your team can overpower it, in urban maps. In more "outdoor" maps, your team should try distracting the Cromwell, until one has the chance to get a kill shot, either in the front, rear, or sides, but preferably the sides. In the hands of a newbie, this tank is fun and effective, but in the hands of a master, it can be a game-changer.

Pros and cons

Pros:

  • Very fast for a medium tank.
  • Great overall mobility.
  • 75 mm is a good gun in lower rank games.
  • RP-3 rockets are able to destroy enemy tanks at long ranges.
  • RP-3 rockets can be very accurate when learned how to use them effectively.
  • 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.
  • Great armour if angled.
  • Armour is able to withstand powerful rounds at long distances.
  • Very good reload time, pending crew skill and experience.

Cons:

  • Very slow reverse speed.
  • Not well armoured for higher tier combat, and the 75 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.
  • Can be penetrated easily at close range.
  • Has no anti-aircraft protection.
  • Can take some time to learn how to use it effectively.
  • Rockets can be hard to aim at first.
  • Rocket racks cannot be adjusted by elevation.
  • RP-3s can only damage heavily armored targets with direct hits.

Specifications

Arcade Realistic Simulator

Arcade Realistic Simulator

Arcade Realistic Simulator

Armaments

1 x 75 mm QF Mk.V cannon (75 Rounds)
4 x 152 mm Rocket Projectile-3 rockets
1 x 7.92 mm BESA machine gun (4,950 Rounds)
6 x Smoke grenade launcher

Main armament

1 x 75 mm QF Mk.V 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.)
  • Reload Rate: 6.5s (Stock), __._s (Full Crew), __._s (Prior + Expert Qualif.), __._s (Prior + Ace Qualif.)
1 x 75 mm QF Mk.V 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.)
  • Reload Rate: 6.5s (Stock), __._s (Full Crew), __._s (Prior + Expert Qualif.), __._s (Prior + Ace Qualif.)
1 x 75 mm QF Mk.V 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.)
  • Reload Rate: 6.5s (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%
M72 Shot 110 109 92 76 62 51 AP 619 6.3 N/A N/A N/A -1° 43° 30° 25°
M48 Shell 10 10 10 10 10 10 HE 463 6.3 0.4 0.5 666 +0° 11° 10°
M61 Shot 93 91 84 75 67 61 APCBC 618 6.8 N/A N/A N/A +4° 42° 27° 19°
Ammo racks
Ammo racks of the Cromwell V.
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 armaments

1 x 7.92 mm BESA machine gun (coaxial)

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:
Normalization At 30°
from horizontal:
Ricochet:
10m 100m 500m 1000m 1500m 2000m 0% 50% 100%
RP-3 75 75 75 75 75 75 SSM* 350 43 N/A 0.1 +0° 11° 10°

* - Surface-to-surface missile

Tertiary armament

4 x 152 mm Rocket Projectile-3 rockets
6 x Smoke grenade launcher

Crew

  • Commander
  • Gunner
  • Loader
  • Driver
  • Assistant Driver

Total: 5 Crew members

Armour

Armour type:

  • Rolled homogeneous armour
Armour Front Sides Rear Roof
Hull 63.5 mm Front plate
25.4 mm (70°) Front glacis
57 mm (19°) Joint plate
25.4 mm (66°) Lower glacis
25.4 mm 32 mm (0-7°) Top
20 mm (58°) Bottom
14 mm
Turret 63.5 mm (1°) Turret front
63.5 (1°) Gun mantlet
63.5 mm 44 mm 20 mm

Notes:

  • Suspension wheels and tracks are 20 mm thick.
  • Rocket racks on the turret are 25 mm thick gun steel.

Engine & mobility

Weight: 28.2 ton

Max Speed: 57 km/h
Stock

  • Engine Power: 930 hp @ 2550 rpm
  • Power-to-Weight Ratio: 32.98 hp/ton
  • Maximum Inclination: 40°

Upgraded

  • Engine Power: 1145 hp @ 2550 rpm
  • Power-to-Weight Ratio: 40.60 hp/ton
  • Maximum Inclination: 43°
Weight: 28.2 ton

Max Speed: 52 km/h
Stock

  • Engine Power: 531 hp @ 2550 rpm
  • Power-to-Weight Ratio: 18.83 hp/ton
  • Maximum Inclination: 40°

Upgraded

  • Engine Power: 600 hp @ 2550 rpm
  • Power-to-Weight Ratio: 21.28 hp/ton
  • Maximum Inclination: 41°
Weight: 28.2 ton

Max Speed: 52 km/h
Stock

  • Engine Power: 531 hp @ 2550 rpm
  • Power-to-Weight Ratio: 18.83 hp/ton
  • Maximum Inclination: 40°

Upgraded

  • Engine Power: 600 hp @ 2550 rpm
  • Power-to-Weight Ratio: 21.28 hp/ton
  • Maximum Inclination: 41°

Modules and improvements

Tier Mobility Protection 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, Smoke grenade

Recommendation:
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.

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

Combat usage

To be filled

Screenshots and fan art

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

Additional information (links)

[Devblog] Cromwell V RP3

References


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uk_a27m_cromwell_5_rp3.png

Icon-country-gbr.png Cromwell RP-3
Nation Britain
Type Medium tank
Rank 2
Battle Rating
3.3
3.3
3.3

   Metric✓       Imperial   

   Metric       Imperial✓   

Characteristics
Weight
28,200 kg
62,170 lb
Number of Crew 5
Hull armour thickness
63.5/44.0/32.0/14.0 mm
2.5/1.73/1.26/0.55 inches
Statistics
Engine power (stock)
930 hp
531 hp
531 hp
Engine power (upgraded)
1,145 hp
600 hp
600 hp
HP/ton ratio (stock)
32.98
33.51
18.83
19.13
18.83
19.13
HP/ton ratio (Upgraded)
40.60
41.25
21.28
21.62
21.28
21.62
Max speed
57 km/h
36 mph
52 km/h
32 mph
52 km/h
32 mph
Main Weapon
1 x 75 mm OQF Mk.V Cannon
Ammo stowage 75 rounds
Vertical guidance -12°/20°
Secondary Weapon
1 x 7.92 mm BESA Machine gun
Ammo stowage 4,950 rounds
Mount Coaxial
Tertiary Weapon
4 x 152 mm RP-3 Rocket
Mount Coaxial
6 x Smoke Launcher
Mount Roof-mounted
Economy
Required RP N/A
Vehicle cost 3,450 GE
Crew training cost 10,000 SL
Max repair cost*
1,360 SL
1,500 SL
1,520 SL
Free repair time (Stock)
2h 54m
4h 48m
4h 48m
Free repair time (Upgraded)
58m
1h 36m
1h 36m
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