Difference between revisions of "A.C.IV"

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== Description ==
 
== Description ==
<!--''In the description, the first part needs to be about the history of the creation and combat usage of the vehicle, as well as its key features. In the second part, tell the reader about the ground vehicle in the game. Insert the screenshot of the vehicle. If the novice player does not remember the vehicle by name, they will immediately understand what kind of vehicle it is talking about.''-->
+
<!--In the description, the first part should be about the history of the creation and combat usage of the vehicle, as well as its key features. In the second part, tell the reader about the ground vehicle in the game. Insert a screenshot of the vehicle, so that if the novice player does not remember the vehicle by name, he will immediately understand what kind of vehicle the article is talking about.-->
 
[[File:GarageImage_A.C.IV.jpg|420px|thumb|left]]
 
[[File:GarageImage_A.C.IV.jpg|420px|thumb|left]]
 
{{break}}
 
{{break}}
The '''Cruiser tank A.C.IV''', also known as the ''AC IV Thunderbolt'' or the ''AC IV Sentinel'', is a premium Rank III British medium tank on the British tree with a battle rating of 5.0. It was released some time after [[Update 1.55 "Royal Armour"]]. Armed with a [[Ordnance QF 17-pounder (76 mm)|17-pounder gun]], it has a high firepower for the battle rating it is in, able to effectively fight any other tanks at the battle rating. The Thunderbolt is also a small and maneuverable tank able to exploit harsh terrain to target the enemy.
+
The '''{{Specs|name}}''', also known as the ''AC IV Thunderbolt'' or the ''AC IV Sentinel'', is a premium Rank {{Specs|rank}} British medium tank on the British tree {{Battle-rating}}. It was released some time after [[Update 1.55 "Royal Armour"]]. Armed with a [[Ordnance QF 17-pounder (76 mm)|17-pounder gun]], it has a high firepower for the battle rating it is in, able to effectively fight any other tanks at the battle rating. The Thunderbolt is also a small and maneuverable tank able to exploit harsh terrain to target the enemy.
  
 
The AC IV is a relatively small medium tank in comparison to the common mainstay of the other countries, especially when compared to the American [[M4A2|Sherman]] tanks. The Sentinel also has a good maneuverability and power-to-weight ratio for the propulsion, able to accelerate to its max speed of roughly 30 km/h quickly and stay there on stable terrain. The tank has a great advantage of a decent reverse speed in comparison to other medium tanks of its caliber, with a reverse speed almost the same speed as forward. The addition of the 17-pounder gun also gives this tank a whopping high firepower for the size, so it can stand a chance against tanks of the same tier despite being out of the league in terms of armour.
 
The AC IV is a relatively small medium tank in comparison to the common mainstay of the other countries, especially when compared to the American [[M4A2|Sherman]] tanks. The Sentinel also has a good maneuverability and power-to-weight ratio for the propulsion, able to accelerate to its max speed of roughly 30 km/h quickly and stay there on stable terrain. The tank has a great advantage of a decent reverse speed in comparison to other medium tanks of its caliber, with a reverse speed almost the same speed as forward. The addition of the 17-pounder gun also gives this tank a whopping high firepower for the size, so it can stand a chance against tanks of the same tier despite being out of the league in terms of armour.
 +
 +
The tank in the game is the version planned for serial production, so it has the hull of the AC III; unlike the actual prototype design developed, which used the hull from the AC I version.
  
 
== General info ==
 
== General info ==
 
=== Survivability and armour ===
 
=== Survivability and armour ===
<!--''Describe armour protection. Note the most well protected and key weak areas. Appreciate the layout of modules as well as the number and location of crew members. Is the level of armour protection sufficient, is the placement of modules helpfull for survival in combat?''
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<!--Describe armour protection. Note the most well protected and key weak areas. Appreciate the layout of modules as well as the number and location of crew members. Is the level of armour protection sufficient, is the placement of modules helpful for survival in combat?
 +
 
 +
If necessary use a visual template to indicate the most secure and weak zones of the armour.-->
 +
The AC IV Thunderbolt's armour have a high tendency to bounce shells. This is obvious with the extreme slope on the from of the tank, and turret design. The armour itself is not thick, but thanks to the angle of it this tank can be very fierce competition to enemy vehicles.
  
''If necessary use a visual template to indicate the most secure and weak zones of the armour.''-->
 
 
'''Armour type:'''
 
'''Armour type:'''
 +
 
* Cast homogeneous armour  
 
* Cast homogeneous armour  
 
* Rolled homogeneous armour (Hull roof)
 
* Rolled homogeneous armour (Hull roof)
 +
 
{| class="wikitable"
 
{| class="wikitable"
 
|-
 
|-
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|}
 
|}
 
'''Notes:'''
 
'''Notes:'''
 +
 
* Suspension wheels and bogies are 20 mm thick, tracks are 20 mm.
 
* Suspension wheels and bogies are 20 mm thick, tracks are 20 mm.
 
* The rear bottom area has a track placed there, providing 20 mm of extra armour.
 
* The rear bottom area has a track placed there, providing 20 mm of extra armour.
 
* The commander cupola is extended outwards from the left side of the turret, creating a vulnerable unsloped area vulnerable to weaker guns.
 
* The commander cupola is extended outwards from the left side of the turret, creating a vulnerable unsloped area vulnerable to weaker guns.
 
The AC IV Thunderbolt's armour have a high tendency to bounce shells. This is obvious with the extreme slope on the from of the tank, and turret design. The armour itself is not think, but due to the angle it is put at this tank is very fierce competition.
 
  
 
=== Mobility ===
 
=== Mobility ===
<!--''Write about the mobility of the ground vehicle. Estimate the specific power and maneuverability as well as the maximum speed forward and backward.''-->
+
<!--Write about the mobility of the ground vehicle. Estimate the specific power and manoeuvrability, as well as the maximum speed forwards and backwards.-->
 
{| class="wikitable" style="text-align:center"
 
{| class="wikitable" style="text-align:center"
 
|-
 
|-
!colspan="3" | Mobility characteristic
+
! colspan="3" | Mobility characteristic
 
|-
 
|-
 
! Weight (tons)
 
! Weight (tons)
!colspan="1" | Add-on Armour<br>weight (tons)
+
! colspan="1" | Add-on Armour<br>weight (tons)
!colspan="1" | Max speed (km/h)
+
! colspan="1" | Max speed (km/h)
 
|-
 
|-
|rowspan="2" | 26.4 || colspan="1" rowspan="2" | N/A || colspan="1" | 53 (AB)  
+
| rowspan="2" | 26.4 || colspan="1" rowspan="2" | N/A || colspan="1" | 53 (AB)  
 
|-
 
|-
 
|48 (RB/SB)
 
|48 (RB/SB)
 
|-
 
|-
!colspan="3" | Engine power (horsepower)
+
! colspan="3" | Engine power (horsepower)
 
|-
 
|-
!colspan="1" | Mode
+
! colspan="1" | Mode
 
!Stock
 
!Stock
 
!Upgraded
 
!Upgraded
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|397
 
|397
 
|-
 
|-
!colspan="3" | Power-to-weight ratio (hp/ton)
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! colspan="3" | Power-to-weight ratio (hp/ton)
 
|-
 
|-
!colspan="1" | Mode
+
! colspan="1" | Mode
 
!Stock
 
!Stock
 
!Upgraded
 
!Upgraded
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== Armaments ==
 
== Armaments ==
 
=== Main armament ===
 
=== 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 flexibilty 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: <code><nowiki>{{main|Name of the weapon}}</nowiki></code>. 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.''-->
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<!--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: <code><nowiki>{{main|Name of the weapon}}</nowiki></code>. 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.-->
 
{{main|Ordnance QF 17-pounder (76 mm)}}
 
{{main|Ordnance QF 17-pounder (76 mm)}}
  
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! 2000m
 
! 2000m
 
|-
 
|-
| Shot Mk.6 || AP || 160 || 157 || 133 || 112 || 96 || 86
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| Shot Mk.6 || AP || 171 || 168 || 155 || 139 || 126 || 113
 
|-
 
|-
 
| Shell Mk.1 || HE || 9 || 9 || 9 || 9 || 9 || 9  
 
| Shell Mk.1 || HE || 9 || 9 || 9 || 9 || 9 || 9  
 
|-
 
|-
| Shot Mk.4 || APC || 165 || 160 || 138 || 108 || 94 || 81
+
| Shot Mk.4 || APC || 171 || 168 || 155 || 139 || 126 || 113
 
|-
 
|-
| Shot Mk.8 || APCBC || 171 || 168 || 156 || 143 || 130 || 120
+
| Shot Mk.8 || APCBC || 190 || 187 || 172 || 155 || 140 || 126
 
|-
 
|-
 
|}
 
|}
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! class="wikitable unsortable" |Visual<br /> discrepancy
 
! class="wikitable unsortable" |Visual<br /> discrepancy
 
|-
 
|-
|| '''50''' || XX&nbsp;''(+X)'' || XX&nbsp;''(+X)'' || XX&nbsp;''(+X)'' || XX&nbsp;''(+X)'' || XX&nbsp;''(+X)'' || XX&nbsp;''(+X)'' || XX&nbsp;''(+X)'' || XX&nbsp;''(+X)'' || 1&nbsp;''(+49)'' || style="text-align:center" | No
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|| '''50''' || XX&nbsp;''(+X)'' || XX&nbsp;''(+X)'' || ''35 (+15)'' || ''45 (+5)'' || 10&nbsp;''(+40)'' || ''14 (+36)'' || 31&nbsp;''(+19)'' || 39&nbsp;''(+11)'' || 1&nbsp;''(+49)'' || style="text-align:center" | Yes
 +
|-
 +
|}
 +
 
 +
===== Optics =====
 +
 
 +
<!--''Explain how the optic's status can affect the tank's gameplay in any unique or meaningful way. A comparison to rival tanks of the rank is welcome.''
 +
 
 +
''If you are having problems with it, refer to the [[Optics|optics gallery]] page for examples.''-->
 +
 
 +
{| class="wikitable" style="text-align:center" width="50%"
 +
! colspan="3" | {{PAGENAME}} [[Optics]]
 +
|-
 +
! Which ones
 +
! Default magnification
 +
! Maximum magnification
 +
|-
 +
! Main Gun optics
 +
| x1.85 || x3.5 <!--Sometimes the actual value may not be known and here it should be referenced if the optic values are an estimate such as with an "X8.3 (estimated)" notation or something else that way the user will then be able to look to the comparable optics section and see a referenced optic which will have actual in-game data to back up the claim.-->
 +
|-
 +
! Comparable optics
 +
| colspan="2;" style="text-align:center;" | [[T-34-57]]
 
|-
 
|-
 
|}
 
|}
 +
 +
Does not have improved zoom like other BR 5 Rank III British tanks, thus has worse zoom than many current opponents, which may have variable zooms up to X5. Do not unnecessarily provoke German SPG, as they have superior optics and are unlikely to miss.
 +
 +
In full up-tier, do not let japanese medium tanks [[ST-A1]] get an upper hand at all costs, as they have optics eclipsing these entirely and might as well snipe A.C.IV from 2 km away, if have accuracy modifications.
  
 
=== Machine guns ===
 
=== Machine guns ===
<!--''Offensive and anti-aircraft machine guns not only allow you to fight some aircraft, but also are effective against lightly armoured vehicles. Evaluate machine guns and give recommendations on its use.''-->
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<!--Offensive and anti-aircraft machine guns not only allow you to fight some aircraft but also are effective against lightly armoured vehicles. Evaluate machine guns and give recommendations on its use.-->
 
{{main|Vickers (7.7 mm)}}
 
{{main|Vickers (7.7 mm)}}
  
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|}
 
|}
  
== Usage in the battles ==
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== Usage in battles ==
<!--''Describe the tactics of playing in the vehicle, the features of using vehicles in the team and advice on tactics. Refrain from creating a "guide" - do not impose a single point of view but give the reader food for thought. Describe the most dangerous enemies and give recommendations on fighting them. If necessary, note the specifics of the game in different modes (AB, RB, SB).''-->
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<!--Describe the tactics of playing in the vehicle, the features of using vehicles in the team and advice on tactics. Refrain from creating a "guide" - do not impose a single point of view but instead give the reader food for thought. Describe the most dangerous enemies and give recommendations on fighting them. If necessary, note the specifics of the game in different modes (AB, RB, SB).-->
 +
 
 
Exploit the A.C. IV's maneuverability against the heavier tanks, plus the 17-pounder tank allows for a penetration through the enemy's armour to cause internal damages. The fast reverse speed makes the "shoot-and-scoot" tactic a viable method against the enemy, and should be the prime one as the armour of the Sentinel is not exactly the most durable at only 50 mm flat. However, the sloping nature of the armour could give the bouncing capability of the tank comparable to the [[T-34 (1942)|T-34]], it's even arguably much better. So while the weight class is definitely against the Sentinel, a chance is always there to take out the opposition.
 
Exploit the A.C. IV's maneuverability against the heavier tanks, plus the 17-pounder tank allows for a penetration through the enemy's armour to cause internal damages. The fast reverse speed makes the "shoot-and-scoot" tactic a viable method against the enemy, and should be the prime one as the armour of the Sentinel is not exactly the most durable at only 50 mm flat. However, the sloping nature of the armour could give the bouncing capability of the tank comparable to the [[T-34 (1942)|T-34]], it's even arguably much better. So while the weight class is definitely against the Sentinel, a chance is always there to take out the opposition.
  
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=== Pros and cons ===
 
=== Pros and cons ===
<!--''Summarize and briefly evaluate the vehicle in terms of its characteristics and combat effectiveness. Mark its pros and cons in a bulleted list. Do not use more than 6 points for each of the characteristics. Avoid using categorical definitions such as "bad", "good" and the like - they have a substitution in the form of softer "inadequate", "effective".''-->
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<!--Summarise and briefly evaluate the vehicle in terms of its characteristics and combat effectiveness. Mark its pros and cons in a bulleted list. Try not to use more than 6 points for each of the characteristics. Avoid using categorical definitions such as "bad", "good" and the like - use substitutions with softer forms such as "inadequate" and "effective".''-->
 +
 
 
'''Pros:'''
 
'''Pros:'''
 +
 
*Good sloped armour.
 
*Good sloped armour.
 
*High penetration solid shot rounds.
 
*High penetration solid shot rounds.
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*Fast reverse speed.
 
*Fast reverse speed.
 
*Small profile.
 
*Small profile.
 +
 
'''Cons:'''
 
'''Cons:'''
 +
 
*Sloped armour only on the front.  
 
*Sloped armour only on the front.  
 
**Susceptible to large caliber HE.
 
**Susceptible to large caliber HE.
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== History ==
 
== 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 big, take it to a separate article, taking a link to an article about the vehicle and adding a block "/historical reference" (example: https://wiki.warthunder.com/Name-vehicles/historical reference) and add a link to it here using the <code>main</code> template. Be sure to include links to sources at the end of the article.''-->
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<!--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: <nowiki>https://wiki.warthunder.com/(Vehicle-name)/History</nowiki>) and add a link to it here using the <code>main</code> template. Be sure to reference text and sources by using <code><nowiki><ref></nowiki></code>, 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 <code><nowiki>=== Encyclopedia Info ===</nowiki></code>, also if applicable).-->
 +
 
 
===Development===
 
===Development===
Australia began designing a tank in November 1940 as the ''AC I'', and was intended to be a cruiser tank weighing between 16 to 20 tons with a [[Ordnance QF 2-pounder (40 mm)|2-pounder gun]]. With no prior experience in producing a domestic tank, Australia sent a task force to the United States to study the [[M3 Lee|M3 Medium]] design to understand the in-and-outs of a tank. They also received the aid of Colonel W.D. Watson MC in December 1940 from Britain, who has many years of tank designing experience. The overall mission ended up having the tank design to have a similar concept as the Canadian ''[[M4A5|Ram]]'' tank, being based off the the M3 Medium chassis and mated with a domestic design of their choice for the upper part. The Australian attached the chassis with a hull and turret with design similarities to the British [[Crusader Mk III|Crusader]] tanks. The design started to become less of a cruiser tank and more of a medium tank by American specifications due to the attempt to up-armour and up-gun the tank to keep up with German armour development.
+
Australia began designing a tank in November 1940 as the ''AC I'', and was intended to be a cruiser tank weighing between 16 to 20 tons with a [[Ordnance QF 2-pounder (40 mm)|2-pounder gun]]. With no prior experience in producing a domestic tank, Australia sent a task force to the United States to study the [[M3 Lee|M3 Medium]] design to understand the in-and-outs of a tank. They also received the aid of Colonel W.D. Watson MC in December 1940 from Britain, who has many years of tank designing experience. The overall mission ended up having the tank design to have a similar concept as the Canadian ''[[M4A5|Ram]]'' tank, being based off the the M3 Medium chassis and mated with a domestic design of their choice for the upper part along with the incorporation of a suspension system of horizontal rubber cylinder springs seen on many early-war French tanks notably the [[H.39]] and [[H.35]]. The Australian attached the chassis with a hull and turret with design similarities to the British [[Crusader Mk III|Crusader]] tanks. The design started to become less of a cruiser tank and more of a medium tank by American specifications due to the attempt to up-armour and up-gun the tank to keep up with German armour development.
  
The first design was completed in February 1942 as the Cruiser Tank Mark 1 (AC I) and designated the "Sentinel". The design was simplified by using existing parts of current tanks and using a cast hull and turret. Though originally specified for a 2-pounder, it was then asked for a [[Ordnance QF 6-pounder Mk.III (57 mm)|6-pounder]] armament. Two Vickers machine gun were used as the coaxial and hull machine gun. With the power of three Cadillac V8 Petrol engines. It was unorthodox, but powerful enough to propel the vehicle. 65 of these tanks were made by June 1943 before being succeeded by a more advanced design known as ''AC III'', also known as the "Thunderbolt". It had better armour and an improved firepower in the form of the 25-pounder howitzer. Despite the bigger gun, the 54-inch turret ring was never expanded to accommodate for the gun's larger size, so the crew experienced a slightly cramped turret interior for the benefit of having a better high-explosive charge and armour-piercing capability. Other differences in the design was the removal of the hull machine gun and a different set-up of the three Cadillac engines. One pilot model was built and plans were made for a production for 25 tanks for further trials, but the program was terminated.  
+
The first design was completed in February 1942 as the Cruiser Tank Mark 1 (AC I) and designated the "Sentinel". The design was simplified by using existing parts of current tanks and using a cast hull and turret. The entire hull being casted would be the first in history as many tanks of the era did not use such techniques. Although originally specified for a 2-pounder, it was then asked for a [[Ordnance QF 6-pounder Mk.III (57 mm)|6-pounder]] armament but due to the manufacturing of such guns not begining at the time in Australia they would have to use the 2 pounder for the first 65 produced. Two Vickers machine gun were used as the coaxial and hull machine gun the later having an armoured mount to protect its water sleeve resulting in a rather lewd looking front of which is made fun of to this day. With the power of three Cadillac V8 Petrol engines. It was unorthodox, but powerful enough to propel the vehicle. 65 of these tanks were made by June 1943 before being succeeded by a more advanced design known as ''AC III'', also known as the "Thunderbolt". It had better armour and an improved firepower in the form of the 25-pounder howitzer. Despite the bigger gun, the 54-inch turret ring was never expanded to accommodate for the gun's larger size, so the crew experienced a slightly cramped turret interior for the benefit of having a better high-explosive charge and armour-piercing capability. Other differences in the design was the removal of the hull machine gun and a different set-up of the three Cadillac engines. One pilot model was built and plans were made for a production for 25 tanks for further trials, but the program was terminated.  
  
Another attempt was made to increase Australian tank firepower with the '''AC IV''' design. It first started when the designers check to see if the turret could mount the massive 17-pounder in use by the British to fight the heavier and more protected German tanks. When the tests proved successful, the 17-pounder was chosen to be the gun for the ''AC IV'', with a new and larger turret and 70-inch turret ring to improve crew comfort. These tanks were only made for evaluation purposes only and were never mass-produced for equipping the armoured units.
+
Another attempt was made to increase Australian tank firepower with the '''AC IV''' design. It first started when the designers check to see if the turret could mount the massive 17-pounder in use by the British to fight the heavier and more protected German tanks. When the tests proved successful, the 17-pounder was chosen to be the gun for the ''AC IV'', with a new and larger turret and 70-inch turret ring to improve crew comfort. These tanks were only made for evaluation purposes only and were never mass-produced for equipping the armoured units. However it would be the only commonwealth tank ever to mount such a gun.
  
 
===Termination===
 
===Termination===
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After the war, the Australian government disposed most of the tanks in 1945, most were sold off by the Commonwealth Disposals Commission. Today, about six Sentinels survive in intact conditions across the world. One notably in the Bovington Tank Museum, and three in Australia in the RAAC Tank Museum, Treloar Technology Centre, and one in the United States in the Collings Foundation.
 
After the war, the Australian government disposed most of the tanks in 1945, most were sold off by the Commonwealth Disposals Commission. Today, about six Sentinels survive in intact conditions across the world. One notably in the Bovington Tank Museum, and three in Australia in the RAAC Tank Museum, Treloar Technology Centre, and one in the United States in the Collings Foundation.
  
'''Trivia:'''<br/>
+
== Media ==
The tank in the game is the version planned for serial production, so it has the hull of the AC III; unlike the actual prototype design developed, which used the hull from the AC I version.
+
{{Youtube-gallery|4yihmbBzke8|'''WT: AC IV Thunderbolt''' - ''Ash''}}
  
== Media ==
+
== See also ==
''An excellent addition to the article will be video guides, as well as screenshots from the game and photos.''
+
''Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example:''
  
== Read also ==
+
* ''reference to the series of the vehicles;''
* [https://warthunder.com/en/devblog/current/849/ [Devblog<nowiki>]</nowiki> AC IV Thunderbolt]
+
* ''links to approximate analogues of other nations and research trees.''
  
== Sources ==
+
== External links ==
''Paste links to sources and external resources, such as:''
+
<!--Paste links to sources and external resources, such as:
 
* ''topic on the official game forum;''
 
* ''topic on the official game forum;''
* ''other literature.''
+
* ''encyclopedia page on the tank;''
 +
* ''other literature.''-->
 +
 
 +
* [https://warthunder.com/en/devblog/current/849/ [Devblog<nowiki>]</nowiki> AC IV Thunderbolt]
  
 
{{Britain medium tanks}}
 
{{Britain medium tanks}}
 
{{Britain premium ground vehicles}}
 
{{Britain premium ground vehicles}}

Revision as of 11:49, 27 November 2019

Rank 2, Sweden
"The Swedish revolver": SAV 20.12.48
Cruiser tank A.C. Mark IV
uk_ac4_thunderbolt.png
AB
RB
SB
General characteristics
Brief
Detailed
5.3/5.3/5.3BR
4 peopleCrew
91 %Visibility
front / side / backArmour
50 / 44 / 44Hull
63 / 63 / 63Turret
Mobility
26.4 tWeight
757 hp397 hpEngine power
29 hp/t15 hp/tSurface density
52 km/h forward
10 km/h back
47 km/h forward
9 km/h back
Speed
Armament
76 mm QF 17-pounder cannonMain weapon
50 roundsAmmunition
5.9 / 7.6 sReload
-10° / 20°Vertical guidance
7.7 mm Vickers machine gunCoaxial weapon
4 250 roundsAmmunition
8.0 / 10.4 sReload
250 roundsBelt capacity
390 shots/minFire rate
Economy
2 980 Ge icon.pngPurchase
Sl icon.png7 000/4 000/3 400Repair
10 000 Sl icon.pngCrew training
270 000 Sl icon.pngExperts
630 Ge icon.pngAces
160 × 2 Talisman.png % Rp icon.pngReward for battle
160 × 2 Talisman.png % Sl icon.png140 × 2 Talisman.png % Sl icon.png100 × 2 Talisman.png % Sl icon.png

Description

GarageImage A.C.IV.jpg


The Cruiser tank A.C. Mark IV, also known as the AC IV Thunderbolt or the AC IV Sentinel, is a premium Rank III British medium tank on the British tree with a battle rating of 5.3 (AB/RB/SB). It was released some time after Update 1.55 "Royal Armour". Armed with a 17-pounder gun, it has a high firepower for the battle rating it is in, able to effectively fight any other tanks at the battle rating. The Thunderbolt is also a small and maneuverable tank able to exploit harsh terrain to target the enemy.

The AC IV is a relatively small medium tank in comparison to the common mainstay of the other countries, especially when compared to the American Sherman tanks. The Sentinel also has a good maneuverability and power-to-weight ratio for the propulsion, able to accelerate to its max speed of roughly 30 km/h quickly and stay there on stable terrain. The tank has a great advantage of a decent reverse speed in comparison to other medium tanks of its caliber, with a reverse speed almost the same speed as forward. The addition of the 17-pounder gun also gives this tank a whopping high firepower for the size, so it can stand a chance against tanks of the same tier despite being out of the league in terms of armour.

The tank in the game is the version planned for serial production, so it has the hull of the AC III; unlike the actual prototype design developed, which used the hull from the AC I version.

General info

Survivability and armour

The AC IV Thunderbolt's armour have a high tendency to bounce shells. This is obvious with the extreme slope on the from of the tank, and turret design. The armour itself is not thick, but thanks to the angle of it this tank can be very fierce competition to enemy vehicles.

Armour type:

  • Cast homogeneous armour
  • Rolled homogeneous armour (Hull roof)
Armour Front Sides Rear Roof
Hull 50.8 mm (66-67°) Frontal glacis
50.8 mm (30°) Driver's port
50.8 mm (7-68°) Lower glacis
44.45 mm (0-12°) 22.22 mm (78°) Top
44.45 mm (21-52°) Bottom
22.22 mm
Turret 63.5 mm (4-47°) Turret front
25.4-63.5 mm (1-68°) Gun mantlet
63.5 mm (0-88°) 63.5 mm (1-53°) 35 mm
Armour Sides Roof
Cupola 63.5 mm 35 mm

Notes:

  • Suspension wheels and bogies are 20 mm thick, tracks are 20 mm.
  • The rear bottom area has a track placed there, providing 20 mm of extra armour.
  • The commander cupola is extended outwards from the left side of the turret, creating a vulnerable unsloped area vulnerable to weaker guns.

Mobility

Mobility characteristic
Weight (tons) Add-on Armour
weight (tons)
Max speed (km/h)
26.4 N/A 53 (AB)
48 (RB/SB)
Engine power (horsepower)
Mode Stock Upgraded
Arcade 615 757
Realistic/Simulator 351 397
Power-to-weight ratio (hp/ton)
Mode Stock Upgraded
Arcade 23.29 28.67
Realistic/Simulator 13.29 15.04

Armaments

Main armament

76 mm OQF 17-pounder
Capacity Vertical
guidance
Horizontal
guidance
Stabilizer
47 -6°/+20° ±180° N/A
Turret rotation speed (°/s)
Mode Stock Upgraded Prior + Full crew Prior + Expert qualif. Prior + Ace qualif.
Arcade 10.7 14.8 _.__ _.__ _.__
Realistic 10.7 12.6 _.__ _.__ _.__
Reloading rate (seconds)
Stock Prior + Full crew Prior + Expert qualif. Prior + Ace qualif.
7.60 _.__ _.__ _.__
Ammunition
Penetration statistics
Ammunition Type of
warhead
Penetration in mm @ 90°
10m 100m 500m 1000m 1500m 2000m
Shot Mk.6 AP 171 168 155 139 126 113
Shell Mk.1 HE 9 9 9 9 9 9
Shot Mk.4 APC 171 168 155 139 126 113
Shot Mk.8 APCBC 190 187 172 155 140 126
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 Mk.6 AP 883 7.7 N/A N/A N/A -1° 47° 60° 65°
Shell Mk.1 HE 883 7.0 0.4 0.5 580 +0° 79° 80° 81°
Shot Mk.4 APC 883 7.7 N/A N/A N/A -1° 48° 63° 71°
Shot Mk.8 APCBC 883 7.7 N/A N/A N/A +4° 48° 63° 71°
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):
17pdr Shell SS Mk.1 754 8.4 13 5 20 50
Ammo racks
Ammo racks of the AC IV Thunderbolt
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
Visual
discrepancy
50 XX (+X) XX (+X) 35 (+15) 45 (+5) 10 (+40) 14 (+36) 31 (+19) 39 (+11) (+49) Yes
Optics
A.C.IV Optics
Which ones Default magnification Maximum magnification
Main Gun optics x1.85 x3.5
Comparable optics T-34-57

Does not have improved zoom like other BR 5 Rank III British tanks, thus has worse zoom than many current opponents, which may have variable zooms up to X5. Do not unnecessarily provoke German SPG, as they have superior optics and are unlikely to miss.

In full up-tier, do not let japanese medium tanks ST-A1 get an upper hand at all costs, as they have optics eclipsing these entirely and might as well snipe A.C.IV from 2 km away, if have accuracy modifications.

Machine guns

Main article: Vickers (7.7 mm)
7.7 mm Vickers
Coaxial mount
Capacity (Belt capacity) Fire rate
(shots/minute)
Vertical
guidance
Horizontal
guidance
4,250 (250) 390 N/A N/A

Usage in battles

Exploit the A.C. IV's maneuverability against the heavier tanks, plus the 17-pounder tank allows for a penetration through the enemy's armour to cause internal damages. The fast reverse speed makes the "shoot-and-scoot" tactic a viable method against the enemy, and should be the prime one as the armour of the Sentinel is not exactly the most durable at only 50 mm flat. However, the sloping nature of the armour could give the bouncing capability of the tank comparable to the T-34, it's even arguably much better. So while the weight class is definitely against the Sentinel, a chance is always there to take out the opposition.

"Shoot-and-scoot" tactics are the best tactics to use with this vehicle. The Sentinel's armour does not let the tank be a brawler, so it must be more "sneaky" against the enemies. Another thing to note is the driver's hatch at the front of the tank. To avoid a frontally penetrating shot, always angle the driver's hatch away from the enemy.

Pros and cons

Pros:

  • Good sloped armour.
  • High penetration solid shot rounds.
  • Good manoeuvrability.
  • Fast reverse speed.
  • Small profile.

Cons:

  • Sloped armour only on the front.
    • Susceptible to large caliber HE.
  • Only 44mm (4.4cm) of side armour.
  • Cannon lacks armour-piercing rounds with high-explosive filler.
  • No APDS rounds, unlike other British medium tanks at this rank.

History

Development

Australia began designing a tank in November 1940 as the AC I, and was intended to be a cruiser tank weighing between 16 to 20 tons with a 2-pounder gun. With no prior experience in producing a domestic tank, Australia sent a task force to the United States to study the M3 Medium design to understand the in-and-outs of a tank. They also received the aid of Colonel W.D. Watson MC in December 1940 from Britain, who has many years of tank designing experience. The overall mission ended up having the tank design to have a similar concept as the Canadian Ram tank, being based off the the M3 Medium chassis and mated with a domestic design of their choice for the upper part along with the incorporation of a suspension system of horizontal rubber cylinder springs seen on many early-war French tanks notably the H.39 and H.35. The Australian attached the chassis with a hull and turret with design similarities to the British Crusader tanks. The design started to become less of a cruiser tank and more of a medium tank by American specifications due to the attempt to up-armour and up-gun the tank to keep up with German armour development.

The first design was completed in February 1942 as the Cruiser Tank Mark 1 (AC I) and designated the "Sentinel". The design was simplified by using existing parts of current tanks and using a cast hull and turret. The entire hull being casted would be the first in history as many tanks of the era did not use such techniques. Although originally specified for a 2-pounder, it was then asked for a 6-pounder armament but due to the manufacturing of such guns not begining at the time in Australia they would have to use the 2 pounder for the first 65 produced. Two Vickers machine gun were used as the coaxial and hull machine gun the later having an armoured mount to protect its water sleeve resulting in a rather lewd looking front of which is made fun of to this day. With the power of three Cadillac V8 Petrol engines. It was unorthodox, but powerful enough to propel the vehicle. 65 of these tanks were made by June 1943 before being succeeded by a more advanced design known as AC III, also known as the "Thunderbolt". It had better armour and an improved firepower in the form of the 25-pounder howitzer. Despite the bigger gun, the 54-inch turret ring was never expanded to accommodate for the gun's larger size, so the crew experienced a slightly cramped turret interior for the benefit of having a better high-explosive charge and armour-piercing capability. Other differences in the design was the removal of the hull machine gun and a different set-up of the three Cadillac engines. One pilot model was built and plans were made for a production for 25 tanks for further trials, but the program was terminated.

Another attempt was made to increase Australian tank firepower with the AC IV design. It first started when the designers check to see if the turret could mount the massive 17-pounder in use by the British to fight the heavier and more protected German tanks. When the tests proved successful, the 17-pounder was chosen to be the gun for the AC IV, with a new and larger turret and 70-inch turret ring to improve crew comfort. These tanks were only made for evaluation purposes only and were never mass-produced for equipping the armoured units. However it would be the only commonwealth tank ever to mount such a gun.

Termination

The AC IV design, along with the entire Australian Cruiser tank program, was terminated in July 1943, ending with only 65 tanks produced and a few prototype models. The reason was that the funds were better spent improving the infrastructure than building new tanks due to the large number of American tanks such as the M4 Medium that were being supplied to Australia. The AC "Sentinel" were all put into storage and kept until the end of the war. The only use the Sentinel saw was in the film The Rats of Tobruk in 1943 when a squadron of AC I tanks were modified to resemble German tanks.

Survivors

After the war, the Australian government disposed most of the tanks in 1945, most were sold off by the Commonwealth Disposals Commission. Today, about six Sentinels survive in intact conditions across the world. One notably in the Bovington Tank Museum, and three in Australia in the RAAC Tank Museum, Treloar Technology Centre, and one in the United States in the Collings Foundation.

Media

WT: AC IV Thunderbolt - Ash

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


Britain medium tanks
Valentine  Valentine Mk I · Valentine Mk IX · Valentine Mk XI
Cromwell  Cromwell I · Cromwell V · Cromwell Mk.V (RP-3)
Based on Cromwell  Challenger · Comet I · Iron Duke IV
Foreign  Grant I · Sherman II · A.C.IV · Strv 81 (RB 52)
Firefly (M4)  Sherman IC "Trzyniec" · Sherman Firefly
Centurion  Centurion Mk 1 · Centurion Mk 3 · Centurion Mk.5 AVRE · Centurion Mk 10 · Centurion Action X · Sho't Kal Dalet · FV4202
Chieftain  Chieftain Mk 3 · Chieftain Mk 5 · Chieftain Mk 10
Challenger  Challenger Mk.2 · Challenger Mk.3 · Challenger 2
Vickers  Vickers MBT · Vickers Mk.7

Britain premium ground vehicles
Light tanks  A13 Mk.I (3rd RTR) · A13 Mk II 1939 · AEC Mk.II
Medium tanks  Grant I · Cromwell Mk.V (RP-3) · Sherman IC "Trzyniec" · A.C.IV · Iron Duke IV · Strv 81 (RB 52) · Centurion Mk.5 AVRE · Sho't Kal Dalet
Heavy tanks  Independent · Excelsior · Black Prince
Tank destroyers  Achilles (65 Rg.) · Rooikat 105