|This page is about the American tank destroyer M18 GMC. For other uses, see M18 Hellcat (Family).|
- 1 Description
- 2 General info
- 3 Armaments
- 4 Usage in battles
- 5 History
- 6 Media
- 7 See also
- 8 External links
The M18 Gun Motor Carriage, also known as the M18 GMC, is a rank III American tank destroyer with a battle rating of 4.7 (AB/SB) and 5.7 (RB). It was introduced in Update 1.49 "Weapons of Victory". The M18 "Hellcat" was the epitome of the American tank destroyer doctrine, it was very fast, very mobile, and has a powerful gun, though with a large trade-off with only 12.7 mm (0.5 inches) of armour.
The M18 "Hellcat" compensates the lack of anti-tank capability on U.S vehicles by having access to a 76 mm gun with APCR ammunition, all in the battle rating of 5.7. This makes the M18 able to fight off many of the high-ranking vehicles it could face like the Panther D, Tiger H1, KV-1, KV-85, and IS-1.
Unlike the other tank destroyers known in the game, the M18 "Hellcat" has access to a 360° traversable turret, allowing players to have a greater arc of fire than a typical casemate tank destroyer like the StuG III, but at the expense of a slightly higher profile. Americans tank destroyers also have very high manoeuvrability compared to other nation's tank destroyers, allowing it to flank the enemy.
The main weak point of M18 is its very thin armour, a feature that actually allows the M18 to reach its high speed. The thin armour makes it possible for any enemy tanks to penetrate the vehicle. A single hit would destroy many critical components in the M18 or cripple the crew. The only saving grace with this extremely thin ammunition is that standard AP rounds may over-penetrate the armour, doing minimal damage to the internals. Thus, when facing the M18, it's best to use AP rounds with explosive fillers or HE and HEAT rounds while avoiding usage of pure AP rounds and APCR.
Survivability and armour
- Rolled homogeneous armour
- Cast homogeneous armour (Gun mantlet)
|Armour||Front (Slope angle)||Sides||Rear||Roof|
|Hull|| 12.7 mm (39-64°) Front glacis
12.7 mm (23-52°) Lower glacis
| 12.7 mm (23-26°) Top
12.7 mm Bottom
| 12.7 mm (12°) Top
12.7 mm (36°) Bottom
|Turret|| 25.4 mm (15-26°) Turret front
19 mm + 25.4 mm (0-55°) Gun mantlet
|12.7 mm (1-21°)||12.7 mm (7°)|| N/A Open-top |
8 mm Bustle and Front
- Suspension wheels and tracks are 15 mm thick.
- Belly armour is 5 mm thick.
- The hull underside right above the tracks are only 8 mm thick.
- Tracks are attached the turret rear, granting some 15 mm in thickness.
|Game Mode||Max Speed (km/h)||Weight (tons)||Engine power (horsepower)||Power-to-weight ratio (hp/ton)|
Modifications and economy
As with every ground vehicle, Parts and FPE are an absolute top priority. Following that, depending on player preferences, one of 3 should be researched: Horizontal Drive (close-range, flanking), Suspension (medium-range) or Adjustment of Fire (long-range of a typical engagements). Following this the goal is to get rank IV mobility improvements in order Filters -> Engine -> Transmission. On rank III, along the way, the Crew Replenishment should be prioritized, as its an open-top vehicle, so it will suffer significant causalities from enemy airplanes. If your preferred engagement range is above 700m then the Elevation Mechanism should be researched. Otherwise: Mobility upgrades are the most important, shells are the lowest priority, as even the situational advantage of the M93 shot is not worth researching over improved mobility, or even accuracy.
76 mm M1 is an extremely capable gun with a high damage potential and a very good gun handling. It can be found on tanks used up to battle rating 6.0, making it one of the most widely used guns throughout the battle ratings and with M18 being the first tanks to use it - it gives it a very high staying power throughout battle ratings. Once upgraded, the turret has very fair guidance in both: horizontal and vertical axis allowing to quickly catch pot-shots, though given exceptional mobility of the platform even it struggles to catch up with the near-instant hull rotation.
|76 mm M1||Turret rotation speed (°/s)||Reloading rate (seconds)|
M18 comes with an exceptionally good stock shell, allowing it to unleash its full potential pretty much right off the bat. Additional unlocks are more specialized.
- M62 shell - - The best anti-tank shell, also the stock round. It has very good penetration and an excellent post-penetration effect.
- M42A1 shell - - The best round for dealing with unarmored targets or unarmored sections of vehicles. It should be used carefully, as everything over 10 mm armour can negate its effects. Typically M62 is superior.
- M79 shot - - Round inferior in every way to the M62, it's in-game largely for historical reasons.
- M93 shot - - Round trades a significantly lower post-penetration effect for a 20% increase in penetration and flatter flight path.
|Ammunition|| Type of
|Penetration @ 0° Angle of Attack (mm)|
|10 m||100 m||500 m||1,000 m||1,500 m||2,000 m|
|Ammunition|| Type of
| Fuse delay
| Fuse sensitivity
| Explosive Mass
(TNT equivalent) (g)
|Smoke shell characteristics|
| Screen radius
| Screen deploy time
| Screen hold time
| Explosive Mass|
(TNT equivalent) (g)
|45||37 (+8)||27 (+18)||17 (+28)||9 (+36)||1 (+44)||No|
Turret empty: 37 (+8)
When fighting in downtiers it's best to take only 17 shells, which allows the turret and sides of the tank to be empty of shells, notably increasing survivability. Otherwise, it doesn't matter how many rounds are loaded, as most hits against the tank will prove deadly regardless.
|12.7 mm M2HB|
|Mount||Capacity (Belt)||Fire rate||Vertical||Horizontal|
Usage in battles
Before all, avoid colourful or bright decals. Camouflage is the main part of the M18's defence. Chances for good performance in battle are: be "invisible", fast and effective.
The M18's speed is its best ally. This speed has to be used for flanking manoeuvres and relocate. Not for trying to cross an open field, that will leave it open to enemy fire, speed is not a substitute for armour.
- This movement will have to be done again and again. Choose a good spot wisely, remove the foliage if necessary to get a clear field of fire. When in the fire spot, use the gun depression and stay in a hull-down position until a target is located. Once a target is locked on, aim at critical components. Try to immobilize the enemy by firing at the engine or transmission, or remove their firepower by shooting the gun or breech, or for instant destruction with a shot to the ammo storage. The last option can work very well or not, as skilled players only carry a few rounds of ammo.
- If positive that the enemy hasn't discovered the firing spot, go for another shot. Stay attentive that none of the enemy's teammates has also located the firing spot. If detected, hide immediately and relocate.
- Flanking is the most dangerous manoeuvre of all because the vehicle will have to be exposed as it moves to the enemy's rear, but it is very effective when it's coordinated with other vehicles. A distraction is needed to gain the enemy's attention while the M18 makes its move. Isolated enemy units are very vulnerable to this tactic. Using the M18 speed to get to the rear and as the enemy heads toward the objective, the firing perspective should give a very clear view of the enemy's side armour. A good shot with the M62 APCBC shell could knock out the enemy rather quickly, but if using solid AP shots like the M79, aim at critical components on mobility and firepower before knocking out the crew or ammo stowage.
Avoid flat terrain
- Flat terrain means that the Hellcat will become an easy target for virtually any vehicle by exposure, especially when not moving or when moving in a straight line. Open plains are the bane of the Hellcat. Whenever possible, one should try to stay amongst hills.
Pros and cons
- Overall mobility is superb, with very responsive manoeuvring that allows the Hellcat to excel in flanking manoeuvres
- Fast reload speed and turret traverse
- Stock APCBC round has great penetration and lots of explosive fillers, rarely requiring more than one penetrating shot to kill common tanks like M4, Cromwell, Tiger H1 or Panther
- Low profile, reducing target size and allows it to hide behind small bushes or rocks easily
- The nature of its thin armour means AP rounds have a tendency to pass straight through without damaging modules, and an APHE fuze may not even be triggered. For example the Russian 122mm will over-penetrate, dealing little damage
- Is one of, if not the best, vehicle at climbing hills, particularly at steep angles
- Thin armour means rapid-fire autocannons, heavy machine guns, and aerial weapons could easily shred it. Beware of the R3 T20 FA-HS, IL-2 and ZSD63!
- Commander is exposed at the 0.50 calibre machine gun mount, and knocking him out would render the weapon useless
- Open-top construction means aerial strikes and artillery could rain havoc onto the crew
- Gun has poor penetration in an uptier, often can't penetrate anything frontally unless hitting a weak spot. The Ho-Ri, Tiger II (H) and M26 are frontally immune to this 76mm M1.
- A moment of immobility due to a damaged engine or transmission could be a sign of impending doom for the M18
- Hull-break mechanics mean any explosions, HEAT or well-aimed AP round could instantly destroy the vehicle
US Tank Destroyer Doctrine
The self-propelled anti-tank doctrine established by the US military called for fast, powerful vehicles able to stop the German blitzkrieg tactics by ambushing the attacking tank forces. This doctrine, known as the "Tank Destroyer Doctrine", called for anti-tank forces to be held in reserve to blunt the massed Panzer attacks that many in the War Department believed was the key to German victory in France in 1940. The concentration of antitank weaponry away from the frontline was eventually determined to be an unnecessary weakness, and the solution was to keep a few anti-tank guns in the front-line as the first defence, while a large reserve of mobile tank destroyers would move in at the location where a German tank breakthrough is happening to ambush and destroy the enemy forces. This role led to the desire for a fast vehicle with a powerful gun and mobility. Minimal emphasis was placed on armour, as the doctrinal role of tank destroyers was to respond rapidly to an enemy armoured breakthrough; heavy armour would only hinder a timely response. The development of a purpose-built tank destroyer languished in bureaucratic limbo for the early years of the war (a delay caused by poor designs such as the M5 Cletrac and bureaucratic infighting between the various departmental cliques), and consequently, the majority of self-propelled tank destroyers were expedients derived from the M4 Sherman chassis. The most common tank destroyer was the M10 GMC, made from the M4 Sherman hull and armed with a 3-inch M1918 gun. Although perfectly capable and welcome addition for frontline forces, it was no faster than an ordinary Sherman tank. The tank destroyers would in 1944 finally receive their purpose-built self-propelled tank destroyer in 1944: the M18 Hellcat.
The origin of the M18 design came as early as December 1941 with the requirement of a Christie suspension and a 37 mm gun. This requirement called for a radical new tank design rather than a derivative of the M4 Sherman. These requirements changed as the war progressed, the first change was to the new and innovative Torsion bar suspension from Buick Motor Division from General Motors and another change was to mount the British QF 6-pounder gun then in use on their Churchill Mark III tanks, the developed prototype vehicle was called the T49 GMC. Then the US Army wanted the heavier 75 mm gun used on the Shermans on it, this prototype was designated the T67 GMC. Finally, the army decided to mount the 76 mm gun also in development for the Sherman onto the prototype, now known as T70 GMC. Changes to hull shape and turret took place to accommodate all these new requirements and armament, but it eventually was approved for service and finally renamed as the M18 GMC and started production in mid-1943, which went on until ending in October 1944 with 2,507 units produced. A variant called the M39 Armored Utility Vehicle was also produced, its turret was removed for space for cargo, 8 personnel, or to tow guns.
These vehicles saw combat debut in the summer of 1944, where they are given the unofficial nickname "Hellcat" by the crews using them. Unlike the M10 tank destroyer that was built before it, the M18 GMC was purely made for emphasis on speed. Armour was restricted down to a maximum of 1-inch (25 mm) on the turret front while the rest of the body plating is a measly .50-inches thick (12.7 mm). The turret was also an open-top design similar to the M10 tank destroyer, meaning the crew are left exposed to the elements and enemy fire and shrapnel. These faults were mitigated by the fact that as its role as a tank destroyer, it was to have minimum contact with infantry and ambush enemy tanks in concealed position rather than face them in an offensive operation. Nevertheless, the M18 GMC was well-liked by the crew for its 76 mm cannon, which allows it to destroy the newer German Tiger Is and Panthers tanks from the front with HVAP ammo (though the Panther at close range only) when unable to flank around to the side or rear of these tanks. The speed was also astounding, reaching 55 miles per hour maximum, this makes the M18 GMC the fastest armoured fighting vehicle in World War II.
While use in the Pacific theatre was limited due to the inadequate armour of Japanese tanks, it saw most of its service in the European theatre against Nazi Germany. Due to the lack in armour and emphasis on speed, the M18 crews utilize the "shoot and scoot" tactic in attacking the enemy from one position and quickly move to another before the enemy could find their initial firing position, this tactic confuses the German tanks, and could even lead them to believe there is more armoured enemy than what it appears. The M18 GMCs were present during the Battle of Arracourt in France as the 704th Tank Destroyer Battalion. Lt. Edwin Leiper led an M18 platoon of C Company and in the battle knocked a total of 15 German tanks for the loss of three M18; six of these German tank kills, most of which were Panthers, were credited to one M18 led by Sgt Henry R. Hartman. The M18 also played a crucial part in the Battle of the Bulge, where its top speed of 55 mph was finally put to good use in bypassing the enemy forces. Four M18 tank destroyers of the 705th Tank Destroyer Battalion assisted the 506th Parachute Infantry Regiment in attacking the 2nd Panzer Divison and their support to kill the fuel lines to the German tanks. The overall attack had the M18 GMC credited with at least 24 tank kills of the 30 total inflicted in the attack.
Overall, the M18 GMC proved itself by having the highest kill-to-loss ratio to any other tanks and tank destroyer in American service, making it the most effective tank destroyer in American service. However, like its other tank destroyer brethren, it soon found itself obsolete along with the entire tank destroyer doctrine. Mainly due to increasing prevalence of well-armoured tanks that could do its job more efficiently such as the M26 Pershing, but also the lack of German AFVs at the time of the war and a study on ammo usage indicates that the tank destroyers spent more time supporting infantry with high-explosive shells than killing tanks with armour-piercing, rendering the anti-tank section an unnecessary component in the modernizing armoured forces.
Today, some countries in the world such as Yugoslavia still have the M18 Hellcats in reserves.
A self-propelled artillery/tank destroyer mount based on the M24 tank. It was part of the American arsenal during World War II. It was produced from the middle of 1943 to October, 1944 and was used in combat operations in Italy and northern Europe. Its primary gun was the M1 76mm cannon, as was the case with late-model Sherman tanks. This tank destroyer featured very light armor, but the M18 was nevertheless the fastest armored vehicle in World War II.
The Hellcat was the most effective anti-tank SPG in the American army despite its extreme vulnerability and the fact that its 76mm cannon was unable to penetrate the armor of late German tanks. The vehicle stood out for its speed and maneuverability. Able to accelerate and change direction quickly, the Hellcat could easily outflank German tanks or even get behind them, whereas the rotation speed of the German tanks was not fast enough to attack the M18 and the M1 cannon could penetrate the enemy's weak points with relative ease.
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.
- [Devblog] M18 and M18 'Black Cat'
- [Vehicle Profile] As fast as deadly: The M18 Hellcat
- [Profile] M18 Gun Motor Carriage – Hellcat
- Zaloga Steven. M18 Hellcat Tank Destroyer 1943-97 Great Britain: Osprey Publishing Ltd., 2004
|Buick Division of General Motors|
|Tank destroyers||M18 GMC|
|Note||Buick was/is a division of General Motors (GM).|
|USA tank destroyers|
|Early projects||M3 GMC · M8 HMC · M8A1|
|Based on M4||M10 GMC · M36 GMC|
|M18||M18 GMC · M18 "Black Cat" · Super Hellcat|
|T95||T28 · T95|
|Post-war||M50 · M56 · T114 · M901 · ADATS · M1128|