A13 Mk I (3rd R.T.R.)

A13 Mk I (3rd R.T.R.)

A13 Mk I (3rd R.T.R.)

Britain

I Rank

Battle rating:

AB	RB	SB
1.0	1.0	1.0

Class:

PREMIUM

Light tank

Purchase:250

This page is about the British light tank A13 Mk I (3rd R.T.R.). For other versions, see A13 (Family).

Description

The Tank, Cruiser, Mk III (A13) (3rd Royal Tank Regiment), also designated in-game as the A13 Mk I (3rd R.T.R.), is a premium rank I British light tank with a battle rating of 1.0 (AB/RB/SB). It was introduced along with the initial British tree line in Update 1.55 "Royal Armour". At some point, it was given for free if you chose Britain as your first nation when you started the game.

General info

Survivability and armour

Smoke grenades

Creation of a smoke screen in front of the vehicle

Armourfront / side / back

Hull14 / 14 / 14

Turret14 / 14 / 14

Crew4 people

Visibility93 %

Armour type:

• Rolled homogeneous armour (hull, turret)
• Cast homogeneous armour (Gun mantlet)

Armour	Front (Slope angle)	Sides	Rear	Roof
Hull	14 mm Front plate 14 mm (0-62°) Front glacis 14 mm (64°) Lower glacis	7 + 7 mm	14 mm (0-62°)	14 mm
Turret	14 mm (0-15°) Turret front 14 mm (1-63°) Gun mantlet	14 mm (21°)	14 mm (2°)	14 mm
Cupola	14 mm	14 mm	14 mm	14 mm

Notes:

• Suspension wheels and tracks are 15 mm thick while the torsion bars in between the side armour are 10 mm thick.
• Hoisting points and optics covers are 14mm thick.
• The sides of the hull benefit from spaced armour (2 x 7 mm spaced ~10 cm apart) but the thickness of the plates is too poor to properly act as such: HEAT and HE shells have no problem defeating it.
• 2 smoke launchers are installed on the right side of the turret. Smoke grenades can be launched individually in the direction the gun is pointing at, 50 m away from your tank. The reload sequence takes places once both launchers are empty.
• The A13 Mk I (3rd R.T.R.) is among the least armoured tanks in the game. Be aware that even when angling, most enemies can reliably penetrate you from 1,000 m distance.
• Even when only exposing the turret of your tank to shoot at an enemy, you can receive devastating damage as your thinly armoured turret is pretty wide and contains 3 crew members out of 4.

Mobility

Speedforward / back

AB54 / 7 km/h

RB and SB48 / 6 km/h

Number of gears5 forward

1 back

Weight13.8 t

Engine power

AB649 hp

RB and SB340 hp

Power-to-weight ratio

AB47.0 hp/t

RB and SB24.6 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	54	7	13.8	527	649	38.19	47.03
Realistic	48	6		301	340	21.81	24.64

The acceleration is good and the top speed is in line with light tanks at the same BR. The reverse speed is slow and won't let you overextend. The tracks are narrow, which gives the A13 Mk I (3rd R.T.R.) poor handling on soft terrain (snow, mud, sand). The tracks are also long, which causes the tank to understeer and lose a lot of speed when turning. All this combined with the lack of neutral steering makes turning on the spot slow.

Modifications and economy

Repair cost

AB322

RB172

SB75

Total cost of modifications5 140

515

Crew training150

Experts1 000

Aces20

Research Aces145 000

Reward for battleAB / RB / SB

2 × 20 / 20 / 20 %

2 × 75 / 75 / 75 %

Modifications

Mobility	Protection	Firepower
Tracks Research: 450 Cost: 45 50 Suspension Brake System Research: 410 Cost: 40 45 Filters Transmission Engine	Improved Parts Improved FPE Crew Replenishment	Horizontal Drive Research: 450 Cost: 45 50 40mm_uk_2pdr_APHV_ammo_pack Research: 450 Cost: 45 50 Adjustment of Fire Research: 410 Cost: 40 45 40mm_uk_2pdr_APHE_ammo_pack Research: 410 Cost: 40 45 Elevation Mechanism Research: 560 Cost: 55 60 Smoke grenade Research: 560 Cost: 55 60 Artillery Support Research: 720 Cost: 75 80 40mm_uk_2pdr_APCBC_ammo_pack Research: 720 Cost: 75 80

Armaments

Main armament

40 mm QF 2-pounder cannon

Shoulder stabilizer

Reduces the swing of the gun in one plane while moving

Ammunition87 rounds

Reloadbasic crew → aces

3.6 → 2.8 s

Vertical guidance-15° / 20°

The cannon loses accuracy and penetration power quickly over distance. The accuracy loss is noticeable as soon as 500 m distance and becomes a handicap over 700 m. Penetration at close range is good but becomes ineffective at 500 m and beyond. The high muzzle velocity allows for rather flat trajectories but targeting enemies at long range will be hindered by the loss of accuracy.

Vertical stabilizer (shoulder stop) allows you to fire when moving at slow pace (a few km/h). The turret traverse speed is average but rather slow when compared than other tanks at the same BR. The depression angle is very important and allows you to shoot easily from behind a ridge. Recoil is barely noticeable. The reload time is very short, allowing you to shower your enemies with a continuous rain of shells. Targeting procedure is quick and simple.

40 mm QF 2-pounder					Turret rotation speed (°/s)					Reloading rate (seconds)
Mode	Capacity	Vertical	Horizontal	Stabilizer	Stock	Upgraded	Full	Expert	Aced	Stock	Full	Expert	Aced
Arcade	87	-15°/+20°	±180°	Vertical	15.23	21.08	25.60	28.31	30.12	3.64	3.22	2.97	2.80
Realistic					9.52	11.20	13.60	15.04	16.00

Ammunition

The available choice of ammunition focuses on armoured targets:

• Shot Mk.1 AP/T : AP; a solid shot with no explosive filler offering a good penetration power until 500 m.
• Shot Mk.1 APHV/T: AP; the same projectile but with higher muzzle velocity, offering a good penetration power until 1,000 m.
• Shot Mk.IXB APCBC/T: APCBC; a solid shot with a ballistic cap and no explosive filler, offering the best penetration power from 0 to 500 m for the A13 Mk I (3rd R.T.R.).
• Shell Mk.1 AP/T: APHE; an armour-piercing shell with explosive filler that will one-shot any tank that is penetrates but has an average penetration power. Use it preferably when enemies are at close range.

Projectiles without explosive filler will most of the time incapacitate enemy tanks and require a second shot to properly knock them out. Knowledge of the positions of crew members in the targeted tank is crucial when playing with solid shots.

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
Shot Mk.1 AP/T	AP	72	68	52	37	27	19
Shot Mk.IXB APCBC/T	APCBC	89	86	77	66	57	50
Shot Mk.1 APHV/T	AP	80	75	58	41	30	21
Shell Mk.1 AP/T	APHE	66	62	49	36	26	20

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%
Shot Mk.1 AP/T	AP	792	1.08	N/A	N/A	N/A	47°	60°	65°
Shot Mk.IXB APCBC/T	APCBC	792	1.24	N/A	N/A	N/A	48°	63°	71°
Shot Mk.1 APHV/T	AP	853	1.08	N/A	N/A	N/A	47°	60°	65°
Shell Mk.1 AP/T	APHE	792	1.08	1.2	9	20.9	47°	60°	65°

Ammo racks

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	9th rack empty	10th rack empty	11th rack empty	12th rack empty	13th rack empty	14th rack empty	15th rack empty	16th rack empty	Visual discrepancy
87	78 (+9)	75 (+12)	72 (+15)	69 (+18)	66 (+21)	62 (+25)	60 (+27)	56 (+31)	51 (+36)	47 (+40)	43 (+44)	41 (+46)	36 (+51)	31 (+56)	16 (+71)	1 (+86)	No

File:Ammoracks A13MkI.png

Ammo racks of the A13 Mk I (3rd R.T.R.)

Notes:

• To minimize the risk of ammo rack detonation, keep racks 1 to 14 empty (31 (+56)). This will guarantee the center hull is empty of shells.

Machine guns

7.7 mm Vickers machine gun (coaxial)

Ammunition3 500 rounds

Belt capacity250 rounds

Reloadbasic crew → aces

10.4 → 8.0 s

Fire rate390 shots/min

The rate of fire of the 7.7 mm Vickers is slow compared to other MGs at the same BR. The small calibre will only allow you to use it as a spotting gun or to mow down minor obstacles blocking your line of sight. Except for engaging vehicles with crew members in the open, your MG won't deal much damage to enemies.

7.7 mm Vickers
Mount	Capacity (Belt)	Fire rate	Vertical	Horizontal
Coaxial	3,500 (250)	390	N/A	N/A

Usage in battles

This vehicle's role is that of a light tank in the truest sense, sporting an acceptable gun, great mobility and virtually no armour to speak of.

This tank has a very active playstyle and should not be used in the front lines. Instead, use your mobility to your advantage: Spot, flank and provide artillery support for your teammates, blind your enemies with well-placed smokes screens in key avenues. Make sure to only target secluded enemies in flanking tactics so you can take full advantage of the element of surprise and outflank your opponent. Never expose yourself for too long because even anti-aircraft guns are a potential threat to your non-angled armour. The QF 2-pounder has an awfully long-range accuracy so you must get close to your enemies to actually land a shot where you expect. Load up this agile (but reluctant) cat with ammo and flank your enemies with a constant flow of bullets.

Modules

Tier	Mobility		Protection	Firepower
I	Tracks		Parts	Horizontal Drive	Shot Mk.1 APHV/T
II	Suspension	Brake System	FPE	Adjustment of Fire	Shell Mk.1 AP/T
III	Filters		Crew Replenishment	Elevation Mechanism	Smoke grenade
IV	Transmission	Engine		Artillery Support	Shot Mk.IXB APCBC/T
This is a premium vehicle: all modifications are unlocked on purchase

Pros and cons

Pros:

• Good gun for its rank
• Fast
• Slim target
• Has a "lock", which is a primitive form of stabilisation; this makes stopping and firing a useful tactic as the 2-pdr doesn't bounce as much as a non-stabilised gun
• Brings lots of ammo to the fight (87 rounds max)
• Has forward-launching smoke launchers
• Coaxial machine gun
• Good horse-power per ton ratio
• Decent turret sewing rate
• -15° gun depression
• Four crewmen and a three-man turret
• Quite a fast reload, makes finishing off a target both quicker and easier
• Very effective in its historical role, a flanker and scout

Cons:

• Next to no armour
• Barely any response from the engine
• Loses speed when turning
• The ability to carry almost 90 rounds comes at a cost, this cost is that the ammunition is very hard to miss and thus, the A13 series suffers from frequent ammunition detonations
• Wiggles when trying to turn on 5th gear
• Regular machine guns can penetrate side armour
• The coaxial machine gun is a Vickers which, compared to other Rank I machine guns, has an incredibly slow fire rate
• Not effective at anything other than how it was historically used; ill-advised to brawl or support heavier vehicles

History

Development

The British development on their cruiser tanks, tanks that focus on mobility to exploit breakthroughs beyond enemy lines, took a turn in 1936 after General Giffard LeQuesne Martel became the Assistant Director of Mechanization at the British War Office, the head of the army in the government. Martel, an advocate of the tanks, and developer of the concept of "tankettes", witnessed a tank demonstration in 1936 that had Soviet designs. The one that attracted his attention was the BT light tank. The BT's use of the Christie suspension had Martel argue for the usage of the same suspension in their tank designs, to which the British government complied with the purchase and licensing of the system from the Nuffield Organization.

The acquired vehicle from the purchase of the Christie suspension was labelled as the A13E1 and became part of the design development under the designation Cruiser Mk III (A13). The General Staff requested for the vehicle to have 30 mm of armour, a 2-pounder gun, and a road speed of 48 km/h. The original vehicle was extensively reworked due to many interior and mechanical issues. Until the tank design was finished, the British Army adopted the Cruiser Mk I (A9) tank for use, but these tanks were delayed due to the A13's near completion. The first prototype was delivered in 1937 under the name A13E2, this featured the turret from the A9 cruiser tank, with a 2-pounder and a Vickers machine gun. The armour on the prototype was 15 mm and the design could reach a top speed under a governor of 48 km/h (64 km/h ungoverned). The last and revised design was the A13E3 that became adopted by the British Army and ordered into production in 1939. The General Staff specification number for the tank was the A13 Mk. I, Cruiser Tank Mark III. 65 of these tanks were ordered from the Nuffield Mechanization & Aero Limited, to which 30 were built before the War Office decided to upgrade the A13 Mk.I with more armour than the A13 Mk.II, Cruiser Tank Mk IV. Some of the A13 Mk.I Cruiser Mk III was also converted into Mk IV to stay modernized.

Combat usage

The A13 first saw combat in the Battle of France under the British Expeditionary Force in 1940. The A13 encountered many troubles during its employment, the crew having little to no training with the new tanks due to their rushed adoption into service. The tanks were in poor condition and some were even missing parts. The A13s were used in the 1st Armoured Division, but many were either destroyed by the superior German armoured forces or abandoned at Calais during the evacuation of Allied troops at Dunkirk, which forced the units to leave behind their heavier equipment.

After the disaster at France, the A13 were still used to support the war. Some were sent to Greece to support their defence against Germany in the Battle of Greece, but a majority were sent to North Africa as part of the Western Desert Campaign near Libya under the 7th Armoured Division. Compared to the time in France, the A13s in North Africa fared much better, ironing out most of its initial defects, and was even more suited to the environment than other tank designs. The A13 was popular with the crew for its high speed, reliability, and a powerful 2-pounder cannon that could engage a majority of Axis tanks in 1941. However, there was an insufficient number of A13s available for use, so tank units were mixed with the faster cruiser tanks and slower infantry tanks, which caused tactical and logistical difficulties trying to accommodate all of the tanks. Another deficiency with the tank and every other British tank with the 2-pounder was the lack of high-explosive shell issued to the tankers, which made them vulnerable to anti-tank guns, which caused a majority of British tank losses in the North African Campaign. Still, the A13 fared very well with its armour and armament until late 1941 where better armoured Panzer IIIs and Panzer IVs began to appear on the battlefield.

Due to its growing obsolescence on the battlefield, the A13 was replaced in 1941 by the better armoured A15 Crusader tank.

Media

Skins

• Skins and camouflages for the A13 Mk I (3rd R.T.R.) from live.warthunder.com.

Videos

A13 Mk I (3rd R.T.R.) Review. A careful playstyle is needed - Joseph 2000

Best gun depression discusses the A13 Mk I (3rd R.T.R.) at 1:33 - War Thunder Official Channel

A13 Mk I (3rd R.T.R.) Tank Review - NUSensei

See also

Vehicles equipped with the same chassis

• A13 Mk I
• A13 Mk II
• A13 Mk II 1939

British vehicles equipped with the same gun

• Tetrarch Mk I
• Daimler Mk II
• Crusader II
• Valentine I
• Matilda III
• Churchill I

Other vehicles of similar role or configuration

• M2A4
• M3 Stuart
• Pz.35(t)
• Stuart I

External links

• [Special] Collect a famous А13 Mk I 3rd RTR for Christmas!
• [Wikipedia] Cruiser Mk III
• [Tanks Encyclopedia] Cruiser Mk.III, A13
• [Wikipedia] 3rd Royal Tank Regiment

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