Chieftain Mk 10

Chieftain Mk 10

Chieftain Mk 5

Challenger Mk.2

Chieftain Mk 10

Chieftain Mk 5

Challenger Mk.2

Britain

VI Rank

Battle rating:

AB	RB	SB
9.0	9.0	9.0

Class:

Medium tank

Research:190 000

Purchase:520 000

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This page is about the British medium tank Chieftain Mk 10. For other uses, see Chieftain (Family).

Description

The Chieftain Mk 10 is a Rank VI British medium tank with a battle rating of 9.0 (AB/RB/SB). It was introduced in Update 1.71 "New E.R.A"..

General info

Survivability and armour

Armour is identical to the earlier Chieftain variants, but with the addition of Stillbrew composite armor over the turret front and turret ring. Stillbrew covers a majority of a hull-down Chieftain's frontal projection, but certain areas are not covered. Weak points include the area directly around the gun breach and a sliver of the turret ring between the hull and turret composite packages.

Due to the very thick, highly angled armor package, Stillbrew-protected areas are very resistant to KE projectiles up until top-tier longrod APFSDS (e.g. DM33, 3BM42, etc.). The simple composition of Stillbrew means it isn't as efficient against chemical shell threats, but it retains a somewhat respectable chemical shell protection of around 500 mm.

Armour types:

• Stillbrew composite armour (turret front, turret ring)
• Cast homogeneous armour (hull front, turret)
• Rolled homogeneous armour (hull sides, hull rear, hull roof, turret roof)
• Aluminium (side skirts)

Armour	Front	Sides	Rear	Roof
Hull	70-127 mm (40-79°) Front glacis 76.2 mm (40-45°) Lower glacis 200* mm (0-45°) Turret ring	88-220 (8-30°) + 13 mm Front Top 50 mm (1-31°) Center Top 37 mm (30°) + 13 mm Rear Top 37 (10°) + 13 mm Bottom	37 mm (1-7°)	13-28 mm
Turret	125-250 + 80-150* mm (2-81°) Turret front 100-220 mm (1-53°) Gun mantlet	45-196 mm (1-65°)	45 mm (1°)	50.8 mm Front 25 mm Rear
Armour	Sides	Roof
Cupola	150 mm	25 mm
Composite armour*	Front	Sides	Rear	Roof
Hull	Turret ring: 200 mm Kinetic 200 mm Chemical	N/A	N/A	N/A
Turret	Turret front: 450 mm Kinetic 500 mm Chemical	N/A	N/A	N/A

Notes:

• Suspension wheels and tracks are 20 mm thick.
• Belly armour is 16 mm of RHA.
• Stillbrew armour at turret ring is pure 200 mm CHA.
• Stillbrew armour on turret front is composed of (80 to 150 mm CHA) + (60 mm rubber) + (150 to 250 mm CHA).

Mobility

Mobility characteristic
Weight (tons)	Add-on Armor weight (tons)	Max speed (km/h)
57.2	N/A	53 (AB)
		48 (RB/SB)
Engine power (horsepower)
Mode	Stock	Upgraded
Arcade	1,178	???
Realistic/Simulator	672	???
Power-to-weight ratio (hp/ton)
Mode	Stock	Upgraded
Arcade	20.59	???
Realistic/Simulator	11.75	???

Armaments

Main armament

120 mm L11
Capacity			Vertical guidance	Horizontal guidance	Stabilizer
53			-10°/+20°	±180°	Two-plane
Turret rotation speed (°/s)
Mode	Stock	Upgraded	Prior + Full crew	Prior + Expert qualif.	Prior + Ace qualif.
Arcade	21.4	_.__	_.__	_.__	_.__
Realistic	13.4	_.__	_.__	_.__	_.__
Reloading rate (seconds)
Stock	Prior + Full crew	Prior + Expert qualif.	Prior + Ace qualif.
9.70	_.__	_.__	_.__

Ammunition

Penetration statistics
Ammunition	Type of warhead	Penetration in mm @ 90°
		10m	100m	500m	1000m	1500m	2000m
Shot L15A3	APDS	320	315	305	294	280	270
Shot L23	APFSDS	410	408	405	400	390	380
Shell L31A7	HESH	152	152	152	152	152	152

Shell details
Ammunition	Type of warhead	Velocity in m/s	Projectile Mass in kg	Fuse delay in m:	Fuse sensitivity in mm:	Explosive Mass in g (TNT equivalent):	Normalization At 30° from horizontal:	Ricochet:
								0%	50%	100%
Shot L15A3	APDS	1370	7.6	N/A	N/A	N/A	+1.5°	75°	78°	80°
Shot L23	APFSDS	1535	3.89	N/A	N/A	N/A	+1.5°	76°	77°	78°
Shell L31A7	HESH	670	17	0.4	0.1	4,100	+0°	73°	77°	80°

Smoke characteristic
Ammunition	Velocity in m/s	Projectile Mass in kg	Screen radius in m	Screen time in s	Screen hold time in s:	Explosive Mass in g (TNT equivalent):
L34	670	17.0	20	5	25	50

Ammo racks

Full ammo	1st rack empty	2nd rack empty	Visual discrepancy
53	(+)	(+)	No

Machine guns

7.62 mm L37A1
Pintle mount
Capacity (Belt capacity)				Fire rate (shots/minute)	Vertical guidance	Horizontal guidance
2,000 (100)				650	-10°/+50°	±120°

7.62 mm L8A1
Coaxial mount
Capacity (Belt capacity)				Fire rate (shots/minute)	Vertical guidance	Horizontal guidance
6,000 (200)				600	N/A	N/A

Usage in battles

The Chieftain Mk 10 has a similar play style to the earlier marks, but gains much-needed additional turret armour. This allows the player to maintain a much stronger hull-down position, as Chieftain turrets without Stillbrew can be penetrated very easily at this rank. The added L23 APFSDS round helps with engaging stronger armour at longer distances as well. These factors make the Mk 10 a "super Chieftain" of sorts; it retains its weaknesses (a weak hull and low mobility) and doubles down on its strengths (a heavily-armoured turret and powerful gun).

A player should seek to avoid brawling and instead entrench themselves in a hull-down, supportive position for the team.

Pros and cons

Pros:

• Stillbrew composite armour makes large areas of the turret impervious to all but the best APDSFS and HEATFS rounds
• L23 APFSDS with 191mm of penetration at 60°
• 10 degrees of gun depression
• Fast reload time for a 120 mm (7.5s - 9.5s)
• Usable reverse speed
• Can unlock a laser rangefinder as a T4 modification, the first British tank in the tree to be able to

Cons:

• Stillbrew composite armour leaves vulnerable areas of the turret unprotected, such as the gun mantlet
• Poor mobility
• Weak hull comprised only of cast armour type (CHA)
• Hull is almost entirely filled with ammunition

History

Concept

The idea of a "universal tank" began in Britain in 1944 when Montgomery and other influential people began advocating for more standardized tank to replace the cruiser and infantry tank classes used on the field. Efforts did not start until after World War II under the General Staff designation A45, with development starting just as the new cruiser tank Centurion started to enter military service. The A45 was cancelled in 1948 after development troubles and its inability to be used as a "universal" platform. Ironically, the Centurion proved to be a better "universal tank" platform than the A45.

Development

The Centurion tank series was very successful in British and its allies' service, but development of new Soviet armour such as the IS-3 and T-54/55 caused the British tank arms race to take another leap forward. Development on the Centurion's successor began in 1951 under the name Medium Gun Tank No. 2. The project's priority was gun and armour, but with mobility to be equal to the Centurion's and a weight of less than 45 tons. The weight limit caused a program known as the Concept Study Programme to commence in order to find ways to keep the tank under that weight limit yet meet all the armour and firepower specifications. One of the concept that came out was the usage of bagged charges, which was already in use on naval ships, but was a new concept for tank ammunition. Thus, a gun using the bagged charge propellant system began development in 1954, along with a new specification by General Staff that the Medium Gun Tank No.2, now known as FV4201, uses a conventional four crew tank with a turret and a better gun and armour than the Centurion. Though the Conqueror heavy tank was one such response to the firepower requirement, limited production cut that to only 200 units built.

The biggest bump to the firepower of the FV4201 was the recommendation of a 120 mm caliber tank cannon. Though the Conqueror used a 120 mm, the new one would incorporate more innovative features such as the bagged charges. Other design features added was the usage of a Rolls-Royce V8 engine, an auxiliary engine, an automatic gearbox, and a reclining seat for the driver. The reclining seat was a very new feature in tank design as it reduced the vehicle's hull height and thus gave it a lower profile. Leyland Motors was assigned to be the main designer for the tank despite their commitment to the Centurion production lines. The manufacturing process of the tank was decided to be cast rather than welded. In 1957, several specifications added to the FV4201 impeded its attempt to fit in the specifications. A bigger turret was designed and it mounted IR equipment for night fighting. Troops requested more frontal and turret side armour, which along with the turret change caused an increase in the tank's overall weight. A controversial decision was also made in 1957 by NATO that tanks should have multi-fuel engines. The FV4201 installed a new engine conforming to these standards in 1958, a German engine derived from a Junkers Jumo aviation engine. This extended development time since the engine compartment had to be redesigned to fit the engine, raising the total tank weight to 50 tons. The engine, designated the L60, was received with mixed reception by the Royal Armoured Corps (RAC) and other users due to its novel features. Britain stayed as the only user of a multi-fuel engine in the Cold War as many other nations found the concept impractical and abandoned it.

As the FV4201 finalized its prototype stages, General Staff sent a revised specification for it. The tank was to have the firepower of the Conqueror with the mobility of the Centurion, an armour that maximizes the protection-weight ratio, a weight limit at 45 ton with a top speed of 26 mph and an operating range of 300 miles. The first wooden prototype was made in March 1959, with full prototypes ordered in June 1959 for troop trials. Vickers-Armstrong and Royal Ordnance Factory shared the manufacturing process and the first prototypes were built in January 1960. The first two prototype FV4201 was trialed in Germany alongside their new Leopard 1. The greatest issue with the FV4201 was the engine, which caused many failures due to vibration, a result of the flawed multi-fuel concept. Trials were delayed due to lack of parts to fix broken pieces and redesigns were requested to fix problems. After a lengthy trial period in 1962, the FV4201, now named the Chieftain, was sent to the operational unit in Germany for service and combat trials. The Chieftain was finally accepted for service in 1st May 1963, despite the many faults in the design. The first deliveries of the improved and redesigned Chieftains began in mid-1965. These were the Chieftain Mk 1's, which further revealed problems with the horsepower that the Mk 2 was designed and sent in April 1966. The Chieftain Mk 3 rolled out of the production lines in September 1969, it now weighed 53 tons and the L60 engine was producing 650 hp, still underpowered for the weight. Engine failures were still frequent and left the Chieftain with a sour note until the Mk 5 variant fixed these pressing issues with a new engine and NBC protection. The Mk 5 would be the main variant of the Chieftain in British service. During its production life from 1965 to 1985, a total of 2,265 Chieftains would be built by Britain, with about 1,000 used by the British Army.

Service

The first British units to receive the Chieftains was the 1st and 5th Royal Tank Regiments back during the trials. The Chieftain, despite its initial engine flaws, proved to be combat-proof and could be upgraded to fit new requirements. Some of these upgrades were the addition of composite add-on armour to fight off new anti-tank technology such as the HEAT rounds. The Chieftain earned the title "most formidable tank in the world" during the 1960's Cold War period and also redefined the specifications of a "main battle tank". Its success is due to its novel main gun and heavily sloped armour, as well as a satisfactory mobility and speed able to compete with the Leopard 1. The Chieftain stayed in use by the British Army On the Rhine on the German border with the Warsaw Pact, which caused the Soviets to in turn station their best tanks such as their T-64's against the Chieftains. The British retained the Chieftains all the way until 1997, when it was replaced by the Challenger II, initially being used in addition to Challenger I.

The Chieftain was also successful on the export market, primarily in the Middle East to the hands of Iran, Jordan, Kuwait, and Oman. Another user of the Chieftain was Israel, with Britain initially agreeing to help set up production for locally produced Chieftains. Two Chieftains were sent for trials among the Israeli Defense Force in 1967. After two years of trials and deliberation for the acquirement of the Chieftains, Britain ultimately refused to offer the Israelis the Chieftain for political reasons. The Israeli trials benefit Britain with data on desert combat with the Chieftain however, and the refusal did jump start Israel's tank program that would become the Merkava.

Despite that, sales to the Middle East soared, with Iran being the major buyer of the Chieftains with at least 887 of mostly the MK3 and MK5 variants sent to them before their revolution in 1979. The Chieftain saw prolonged combat in the Middle East in the Iran-Iraq War, including Operation Nasr which was the largest tank vs. tank battle of the war where the Iranian Chieftains and M60A1 Pattons fought against the Iraqi T-62s. After that war, the Chieftain in Kuwait then saw combat fighting the Iraqis during their invasion in 1990. Kuwait eventually replaced their Chieftains with the Yugoslavian M-84 tanks, which are a variant of the Soviet T-72s.

The Chieftain is still in service Iran, Jordan, and Oman in varying numbers, about 100 in Iran, 350 in Jordan, and 27 in Oman. The Chieftains underwent local upgrades to keep them up to date against modern threat, which resulted in the Iran Mobarez Chieftain upgrade.

Legacy

The Chieftain helped revolutionize tank design with its innovative features. The most important was the reclining driver seat, which allowed the tank to have a lower profile as the driver was now that highest part of the hull in tank design. It also had the most powerful NATO tank armament in service until the advent of the German Rheinmetall 120 mm, which came about two decades later. Chieftain can be considered the definitive main battle tank of the 1960s and help transition the path between second-generation main battle tanks and the third.

Media

An excellent addition to the article will be video guides, as well as 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

[Devblog] Chieftain Mk.10: Dressing Up for War