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 first nation when you started the game.

General info

Survivability and armour

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 7mm spaced circa 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, 50m 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 armored tanks in the game. Be aware that even when angling, most enemies can reliably penetrate you from 1,000 m distance.

Mobility

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

Armaments

Main armament

Give the reader information about the characteristics of the main gun. Assess its effectiveness in a battle based on the reloading speed, ballistics and the power of shells. Do not forget about the flexibility of the fire, that is how quickly the cannon can be aimed at the target, open fire on it and aim at another enemy. Add a link to the main article on the gun: {{main|Name of the weapon}}. Describe in general terms the ammunition available for the main gun. Give advice on how to use them and how to fill the ammunition storage.

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	88	83	64	46	33	24
Shot Mk.1 APHV/T	AP	80	78	67	56	47	40
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	9.0	19 (20.9)	47°	60°	65°

Ammo racks

Last updated: 1.99.0.51

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

The rate of fire of the 7.7mm Vickers is slow compared to other MGs at the same BR. The small caliber 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.

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.IXB APCBC/T
II	Suspension	Brake System	FPE	Adjustment of Fire	Shot Mk.1 APHV/T
III	Filters		Crew Replenishment	Elevation Mechanism	Smoke grenade
IV	Transmission	Engine		Artillery Support	Shell Mk.1 AP/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

Describe the history of the creation and combat usage of the ground 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: https://wiki.warthunder.com/(Vehicle-name)/History) and add a link to it here using the main template. Be sure to reference text and sources by using <ref>, as well as adding them at the end of the article. This section may also include the vehicle's dev blog entry (if applicable) and the in-game encyclopedia description (under === In-game description ===, also if applicable).

Media

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

See also

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• reference to the series of the vehicles;
• links to approximate analogues of other nations and research trees.

External links

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

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