T20

T20

T20

USA

IV Rank

Battle rating:

AB	RB	SB
6.3	6.3	6.3

Class:

PREMIUM

Medium tank

Purchase:3 850

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Description

The Medium Tank T20 is a premium rank IV American medium tank with a battle rating of 6.3 (AB/RB/SB). It was introduced in Update 1.63 "Desert Hunters". Intended as a replacement for the M4 Sherman tank, it features a rear transmission that gives it a much lower profile than the Sherman series, as well as the 76 mm M1 gun for additional anti-tank firepower.

The T20 is a more mobile and smaller vehicle platform than the Sherman series. A vehicle with a similar playstyle to the T20 would be the T25, not surprising considering the T25 is an upgrade of the T20 prototype models.

General info

Survivability and armour

Armourfront / side / back

Hull63 / 50 / 38

Turret88 / 63 / 63

Crew5 people

Visibility85 %

The armour is similar to a late M4 Sherman model with a sloped 63.5 mm, as such enemies that can take out the M4 (76) models will also be able to penetrate the T20 straight through the front hull unless compound angling.

Armour type:

• Cast homogeneous armour (Hull, Turret)
• Rolled homogeneous armour (Hull rear, Turret roof)

Armour	Front (Slope angle)	Sides	Rear	Roof
Hull	63.5 mm (47°) Front glacis 63.5 mm (52°) Lower glacis	50.8 mm Front 38.1 mm Rear	38.1 mm (11-54°)	19 mm
Turret	88.9 mm (2-55°) Turret front 88 + 88.9 mm (1-23°) Gun mantlet	63.5 mm (0-58°)	63.5 mm (3-69°)	25.4 mm
Cupola	51 mm	51 mm	51 mm	25.4 mm

Notes:

• Suspension wheels and tracks are 20 mm thick.
• The sides have boxes and sand skirts that give an additional 4 mm of armour
• Belly armour is 12.7 mm thick.

Mobility

Speedforward / back

AB63 / 21 km/h

RB and SB56 / 19 km/h

Number of gears6 forward

2 back

Weight29.8 t

Engine power

AB954 hp

RB and SB500 hp

Power-to-weight ratio

AB32.0 hp/t

RB and SB16.8 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	63	21	29.8	775	954	26.01	32.01
Realistic	56	19		442	500	14.83	16.78

The T20's greatest strength lays in its mobility. The forward and reverse speeds are nearly the same due to the transmission, so retreating from cover after exposing itself to fire is easy and quick.

Modifications and economy

Repair cost

AB1 840

RB2 075

SB2 659

Crew training10 000

Experts290 000

Aces710

Research Aces960 000

Reward for battleAB / RB / SB

2 × 110 / 160 / 190 %

2 × 166 / 166 / 166 %

Modifications

Mobility	Protection	Firepower
Tracks Suspension Brake System Filters Transmission Engine	Improved Parts Improved FPE Crew Replenishment	Horizontal Drive Adjustment of Fire 76mm_usa_APCBC_ammo_pack Elevation Mechanism 76mm_usa_M93_APCR_ammo_pack Artillery Support

Armaments

Main armament

76 mm M1 cannon

Vertical stabilizer

Reduces the swing of the gun in one plane while moving

Ammunition75 rounds

Reloadbasic crew → aces

7.6 → 5.9 s

Vertical guidance-10° / 25°

Armed with the 76 mm M1 gun, the T20's armament can do sterling performances against vehicles of its calibre, so while the T20 itself is easy to take out, it can destroy the enemy the same if it can get the first penetrating shot off first. The front placement of the turret also allows the T20 to expose the minimum amount of its body when it comes out to fire.

76 mm M1					Turret rotation speed (°/s)					Reloading rate (seconds)
Mode	Capacity	Vertical	Horizontal	Stabilizer	Stock	Upgraded	Full	Expert	Aced	Stock	Full	Expert	Aced
Arcade	75	-10°/+25°	±180°	Vertical	22.85	31.63	38.40	42.47	45.18	7.67	6.79	6.25	5.90
Realistic					14.28	16.80	20.40	22.56	24.00

Ammunition

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
M79 shot	AP	134	132	121	109	99	89
M42A1 shell	HE	7	7	7	7	7	7
M62 shell	APCBC	149	146	133	119	106	95

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%
M79 shot	AP	792	6.8	N/A	N/A	N/A	47°	60°	65°
M42A1 shell	HE	823	5.84	0	0.1	390	79°	80°	81°
M62 shell	APCBC	792	7	1.2	14	63.7	48°	63°	71°

Ammo racks

Ammo racks of the T20

Full ammo	1st rack empty	2nd rack empty	3rd rack empty	4th rack empty	5th rack empty	6th rack empty	Visual discrepancy
75	57 (+18)	47 (+28)	33 (+42)	19 (+56)	9 (+66)	1 (+74)	Yes

Note:

• Turret empty: 47 (+28) shells.

Machine guns

12.7 mm M2HB machine gun

Ammunition1 000 rounds

Belt capacity200 rounds

Reloadbasic crew → aces

10.4 → 8.0 s

Fire rate575 shots/min

Vertical guidance-10° / 30°

7.62 mm M1919A4 machine gun (coaxial)

Ammunition5 000 rounds

Belt capacity250 rounds

Reloadbasic crew → aces

10.4 → 8.0 s

Fire rate500 shots/min

12.7 mm M2HB
Mount	Capacity (Belt)	Fire rate	Vertical	Horizontal
Pintle	1,000 (200)	577	-10°/+30°	±180°

7.62 mm M1919A4
Mount	Capacity (Belt)	Fire rate	Vertical	Horizontal
Coaxial	5,000 (250)	500	N/A	N/A

Usage in battles

Tactics

Offense: The T20 in an offensive mode should be done by exploiting its mobility with the terrain. Thus, the T20 would be great in areas with lots of cover. Unless in a close-range engagement or in an emergency, it is not recommended to fire the T20's cannon while on the move just like any other tank as it affects accuracy. Thus, the T20 should move forwards, make contact with an enemy, fire if possible then move to cover if the enemy was not taken out with the first shot. The T20 should not go alone due to the vulnerability of its armour, so make sure allies are accompanied with the T20 for additional firepower and protection, most preferably a heavy tank.

Defense: The T20 in a defensive mode should be played similarly like the M18 Hellcat due to its mobility and firepower. However, a benefit over the M18 is the increased armour, so more risk could be taken with exposing the tank to the enemy to get a good shot placement. Allow the enemy to run their tank into the T20's line of sight, don't try to move and expose the tank otherwise the attacking enemy tank would be aware of the T20's position and also may shoot first, disabling critical components if not destroying the T20 outright. Due to the positioning of the internal components, an enemy tank attacking the rear would actually minimize the damage to the crew compartment as the shell must pass through both the transmission and the engine. If the turret ring and crew remain untouched (unlikely, but a possibility), the player could traverse the turret to the enemy at the rear and attack it, though the attack on the engine may also create a fire, so the FPE modification is necessary for this unorthodox method.

Other considerations

Most medium tanks that the T20 will meet in battle can be penetrated through their front armour, though flanking will be more effective when facing more heavily-armoured opponents in an uptier such as later Panther variants, the T-44, and the Strv 81, etc.

Most heavy tanks and some case-mate tank destroyers such as the IS-2, the Tiger II, the Jagdpanther and the Jagdtiger will be almost impossible to defeat from the front due to their thick armour. Thus, it is necessary to flank such opponents in order to be able to easily destroy them from the side and rear.

Any tanks at the BR will, of course, be easy targets if the T20 catch them at their sides, which is very possible due to the greater mobility of the tank. A single hit from the 76 mm APCBC shell will devastate the interior and can lead to quick destruction or loss in combat efficiency.

Practically all enemies at the BR will be able to easily penetrate the front armour of the T20, with the exception of most SPAAs, so it is important to stay out-of-sight and avoid direct engagements whenever possible.

Pros and cons

Pros:

• 76 mm M1 cannon reloads fast and does good post-penetration damage
• Smaller and lower profile than average; makes for a small target
• Fast turret traverse rate
• Good gun elevation and depression
• Very mobile; fast both in forward and reverse
• Sloped 63.5 mm front hull armour is surprisingly resistant and often ricochets shots
• Rear transmission and engine may help absorb rear shots to protect crew
• RP and SL boost from premium status, which is great for grinding through Rank III - IV vehicles

Cons:

• Frontal armor, though rather resistant, is unreliable and can still fairly easily be penetrated, especially by guns with very high penetration commonly seen in uptiers
• Side and rear armor is weak
• Small internal volume means that one shot can easily cripple or completely knock out the crew and/or modules
• Front ammo rack between driver & co-driver doesn't empty until no ammo is left
• The 76mm M1 cannon is lacking in penetration power, and is missing the APCR round found on other 76 mm M1 equipped vehicles that are contemporaneous with the T20

History

Development

When the M4 Sherman went into production in October 1941, it was considered one of the best Allied tanks of the time period. However, the observers in the North African Campaign noticed a trend in German tank development. Tanks like the Panzer III were getting better frontal armour and a longer 5 cm cannon, and the same happened with the Panzer IV when it received the long 7.5 cm cannon as its main armament. These two tanks' improvements indicated that overtime, the Sherman itself may find itself on the shorter end of the stick, and thus plans for its successor started in Spring of 1942.

The new tank was to have superior aspects of firepower, mobility, and armour over the M4 Sherman and German counterparts, as well as the incorporation of lessons learned from the tank fighting against German forces. The new tank was one of the more technologically advanced American tanks by attempting to meet these requirements. The layout on the tank was similar as the Sherman's, with two in the front driving compartment and three in a turret. The surface area of the tank was reduced by utilizing a box design for the hull rather than sponsons, which led to equipment being stored outside the tank rather than inside it as in the M4. The tank's size was further reduced by having the transmission design be placed in the rear of the tank by the engine rather than in the front, leading to the removal of the power shaft needed to connect the front transmission on the M4 to its engine. This arrangement led to the tank having a much smaller profile than the M4. To further improve the tank, it was decided to give the tank a high-velocity 76 mm gun. In May 1942, the first mock-up of the tank was produced, showing all its advantages over M4 Medium while keeping the same weight. Many of the observers present, including General Devers, liked the design and thus Ordnance Department continued forth with its development, designating the base vehicle as the T20.

Testings

The T20 design went through many tests and variants as Ordnance try out various components and parts to see which would work best. One of the attempts was to try out different armaments as the 76 mm M1 was still new from the developmental stage, leading to the usage of guns like the 3-inch gun on the "E2" variants from the M10 and a 75 mm gun on the "E1" variants from the Sherman with an added autoloader. Transmission designs were tried as well, each with distinctive names. While the T20 designation stands for the tank with an automatic transmission, the T22 had a gear box transmission from the Sherman and the T23 had an electric drive derived from the M6 heavy tank. Of all these designs, none of the "E2" variants were produced as the 76 mm M1 proved successful, and only one "E1" was built on the T22.

Another tried component was the suspension system on the T20 designs. The T20 and T22 produced in May and June 1943 respectively had an early variant of the horizontal-volute suspension system (HVSS), which would see itself on the M4 Sherman in the future (The first T23 would have the standard vertical-volute suspension system (VVSS) already used on the Sherman). Tests on the tanks progressed until Armored Force recommended the usage of a torsion bar suspension system on the tanks with wider tracks. This led to the T20E3 tank, the second pilot model for the T20, to be produced in July 1943 with said torsion bar suspension, though it would not be the only T20 series tank that would have the specific suspension.

Testings with the tank in general went without much fanfare. The T20's transmission proved to be unreliable with oil leaks and overheating, but testings continued until February 1944 (T20E3 until December) when the T20 was dropped in favor of other promising designs. The T22 also encountered trouble in the transmission and engine after driving 900 miles, the continued problems also causing the T22 to be dropped in February 1944. The T22E1 design with the 75 mm autoloading gun arrived for tests in November 1943, and though the autoloader worked with a 20 round per minute fire rate, the insufficiency of the 75 mm gun and the questionable reliability of the autoloader had it dropped in February 1944. Of the designs, the T23 is the one that proved promising enough for an order of 250 tanks to be placed in May 1943.

T23

The T23 tank design with the rear electric transmission was rather popular in the testing grounds. A perk of the electric transmission is that the engine's performance can be varied without being in proportion with the speed of the tank, allowing for the prolonging of the engine life. Another thing the electric transmission provide is that it could be remote-controlled (though this feature was not tested for efficiency). Ten T23 prototypes arrived at Abderdeen Proving Grounds and Fort Knox for service tests around October 1943, and while the prototypes performed well compared to the other T20 series, it was deemed unsatisfactory for combat usage for its difficult maintenance attention. Another reason they refused the tank was logistics, as accepting a totally new tank without much parts commonality with their current M4 Sherman means for the retraining of tank and maintenance crew as well as obtaining a large inventory of spare parts to keep the tank in operational order. As such, the T23 was not approved for service by Armored Forces.

T23 still saw tests and in April 1943, a recommendation came in for the T23 to be used with a torsion bar suspension system, which was done and delivered in 29 August 1944 as the T23E3. After being sent to Aberdeen Proving Ground for tests and then to Fort Knox for inspection by Armored Forces, they once again refused it due to a lack in interest to the complicated electric transmission. Another test attempt was on the T23E4 variant which gave the T23 tank the same HVSS as on the Sherman, however objection by the U.S. Army engineers for its excessive width and lack of attention by armoured boards once again put the T23 on hold, and kept it that way until the end of the war.

Successors

With the initial rejection of the T23 by Armored Forces, it was clear that they were looking for something much more than a marginal upgrade over their existent and abundant M4 Shermans. By the time the T20 series were tested, the U.S. forces have discovered two new tanks on the battlefield, the Tiger I and the Panther. With these new benchmarks, the T20 would not be as big of an improvement over the M4 Sherman when coming up against these two specific tanks. However, not all was lost with the T20 series as Ordnance Department's tests on the tanks were incorporated into future tank designs. The T23's turret was first adapted onto the M4A1 Sherman to give the Sherman a 76 mm gun as the original Sherman turret with the 75 mm gun was too small for the 76 mm gun. The tested horizontal-volute suspension system on the T20s was also adapted onto the Sherman in the "E8" program, producing tanks like the M4A3E8. As these components, the T20's engineering feat carried on to help the American forces fight in Normandy and beyond.

The T20 still left a basis for future designs as in the production time of the T23, the preexisting request for 250 was altered for 50 of them to be modified. 40 of them to be upgraded with a 90 mm gun and 10 more with the same gun upgrade, but with an armour upgrade as well. These programs would be called the T25 and T26; the latter eventually becoming the approved American tank M26 Pershing.

Media

Skins

• Skins and camouflages for the T20 from live.warthunder.com.

Videos

The Shooting Range #84 - Pages of History section at 05:53 discusses the T20.

See also

Related development

• M26 (Family)