Difference between revisions of "20pdr OQF Mk.I (84 mm)"

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[[File:Weapon 20pdr OQF Mk.I (84 mm).png|thumb|right|x250px|The 20pdr OQF Mk.I (84 mm) on the Centurion Mk.5/1 gun mantlet.]]
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== Description ==
 
== Description ==
−
The 20pdr OQF Mk.I is a British tank armament, developed after the end of WWII to combat the Soviet [[IS-3]]. It fires a variety of conventional shells typical of British guns, but introduces a new subcaliber APDS round paired with a two-plane stabilizer on all but one of its implementations, making it one of the most deadly armaments at its battle rating.
+
<!-- ''Write an introduction to the article in 2-3 small paragraphs. Briefly tell us about the history of the development and combat using the weaponry and also about its features. Compile a list of air, ground, or naval vehicles that feature this weapon system in the game.'' -->
 +
The 20pdr OQF Mk.I is a 84 mm British tank cannon, developed after the end of WWII to combat the Soviet [[IS-3]]. It fires a variety of conventional shells, but introduces a new subcalibre APDS round paired with a two-plane stabilizer on all but one of its implementations.
  
 
=== Vehicles equipped with this weapon ===
 
=== Vehicles equipped with this weapon ===
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* {{Specs-Link|uk_centurion_action_x}}
 
* {{Specs-Link|uk_centurion_action_x}}
 
* {{Specs-Link|uk_centurion_mk_3}}
 
* {{Specs-Link|uk_centurion_mk_3}}
−
 
+
* {{Specs-Link|uk_centurion_mk_5_raac}}
 
* {{Specs-Link|uk_charioteer_mk_7}}
 
* {{Specs-Link|uk_charioteer_mk_7}}
 +
* {{Specs-Link|sw_charioteer_mk_7}}
 
* {{Specs-Link|uk_fv4202}}
 
* {{Specs-Link|uk_fv4202}}
 +
* {{Specs-Link|il_centurion_mk_5_shot}}
  
 
== General info ==
 
== General info ==
−
The 20pdr is first seen on the Charioteer without a stabilizer, but it isn't until it is mounted on the many Centurion variants that it truly shines. Its APCBC round has penetration comparable to the Tiger II's , but as usual for British tanks it lacks explosive filler. The unlockable APDS Mk.3 round, however, can reliably penetrate most tanks frontally with 285mm of penetration at point blank, with a very high velocity that can allow one to land shots at long range with a punctual consistency. Unfortunately, the great penetration and good ballistics comes at a cost as the APDS round has very poor post-penetration damage, with a narrow cone of damage and no explosive filler. One must have a very extensive knowledge of enemy crew placement or ammo rack locations to reliably eliminate enemy tanks with one shot. For a player less familiar with enemy vehicles at the battle rating, it is advised to try to incapacitate the gunner or knock out the cannon to ensure the tank will not fire back at the user.
+
<!-- ''Tell us about the tactical and technical characteristics of the cannon or machine gun.'' -->
 +
The 20pdr is first seen on the Charioteer without a stabilizer, but it isn't until it is mounted on the many Centurion variants that it truly shines. Its APCBC round has penetration comparable to the Tiger II's , but as usual for British tanks it lacks explosive filler. The unlockable APDS Mk.3 round, however, can reliably penetrate most tanks frontally with 285 mm of penetration at point blank, with a very high velocity that can allow one to land shots at long range with a punctual consistency. Unfortunately, the great penetration and good ballistics comes at a cost as the APDS round has very poor post-penetration damage, with a narrow cone of damage and no explosive filler. One must have a very extensive knowledge of enemy crew placement or ammo rack locations to reliably eliminate enemy tanks with one shot. For a player less familiar with enemy vehicles at the battle rating, it is advised to try to incapacitate the gunner or knock out the cannon to ensure the tank will not fire back.
  
 
=== Available ammunition ===
 
=== Available ammunition ===
−
 
+
<!-- ''Describe the shells that are available for the weapon and their features and purpose. If it concerns autocannons or machine guns, write about different ammo belts and what is inside (which types of shells).'' -->
−
{| class="wikitable sortable"
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{{:{{PAGENAME}}/Ammunition|Shot Mk.1, Shot Mk.3, Shell Mk.1, 20pdr Shell SS Mk.1}}
−
! colspan="8" |Penetration Statistics
 
−
|-
 
−
!Ammunition
 
−
!Type of Warhead
 
−
! colspan="6" |'''Penetration @ 0° Angle of Attack (mm)'''
 
−
|-
 
−
!
 
−
!
 
−
!10
 
−
!100
 
−
!500
 
−
!1000
 
−
!1500
 
−
!2000
 
−
|-
 
−
|Shot Mk.1
 
−
|APCBC
 
−
|232
 
−
|229
 
−
|216
 
−
|201
 
−
|187
 
−
|173
 
−
|-
 
−
|Shot Mk.3
 
−
|APDS
 
−
|285
 
−
|283
 
−
|262
 
−
|239
 
−
|218
 
−
|198
 
−
|-
 
−
|Shell Mk.1
 
−
|HE
 
−
|15
 
−
|15
 
−
|15
 
−
|15
 
−
|15
 
−
|15
 
−
|}
 
  
 
=== Comparison with analogues ===
 
=== Comparison with analogues ===
 +
<!-- ''Give a comparative description of cannons/machine guns that have firepower equal to this weapon.'' -->
 
With the APDS rounds, the 20pdr has a penetration level similar to that of 3BM4 found on the [[T-62]]. The APCBC round's closest analogue is the PzGr. 39/43 found on the late-war German tanks such as the [[Tiger II (Family)|Tiger II]] and [[Ferdinand]].
 
With the APDS rounds, the 20pdr has a penetration level similar to that of 3BM4 found on the [[T-62]]. The APCBC round's closest analogue is the PzGr. 39/43 found on the late-war German tanks such as the [[Tiger II (Family)|Tiger II]] and [[Ferdinand]].
  
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=== Pros and cons ===
 
=== Pros and cons ===
 +
<!-- ''Summarise and briefly evaluate the weaponry in terms of its characteristics and combat effectiveness. Mark pros and cons as a list.'' -->
 
'''Pros:'''
 
'''Pros:'''
  
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* High velocity and low drop, easy to hit moving and distant targets
 
* High velocity and low drop, easy to hit moving and distant targets
 
* Usually stabilized on both axis
 
* Usually stabilized on both axis
−
 
−
*
 
  
 
'''Cons:'''
 
'''Cons:'''
  
 
* Poor post-penetration damage with all rounds
 
* Poor post-penetration damage with all rounds
−
 
−
*
 
  
 
== History ==
 
== History ==
−
 
+
''Examine the history of the creation and combat usage of the weapon 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 weapon and adding a block "/History" (example: <nowiki>https://wiki.warthunder.com/(Weapon-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></ref></nowiki></code>, as well as adding them at the end of the article with <code><nowiki><references /></nowiki></code>.''
−
=== Development ===
 
−
''The 20 pounder's design followed that of the German [[KwK43 (88 mm)|8.8 cm KwK 43]], a cannon used in the Second World War Tiger series tanks. Like the [[KwK43 (88 mm)|KwK 43]], the 20 pounder had a length of 66.7 calibres and could fire both APCBC and sub-calibre rounds. The 20 pounder's APCBC projectile had a muzzle velocity of 1,020 meters per second and could penetrate 21 cm of rolled homogeneous armour (RHA) while the APDS projectile had a muzzle velocity of 1,465 m/s (4,810 ft/s) and could penetrate 30 cm (12 in) of RHA. The 20-pounder could also fire high-explosive and canister shot.''
 
−
 
 
−
=== Service history ===
 
−
The gun was fitted predominantly to the Centurion tank, seeing action with British and Australian forces during the Korean and Vietnam War. When a Soviet T-54A main battle tank was driven to the British embassy in Budapest by Hungarian rebels during the Hungarian Revolution of 1956, analysis of its armour and 100 mm gun led British officials to determine that the 20 pounder was ineffective at defeating Soviet armour. This led to the development of the 105 mm L7 tank gun, which was designed to fit specifically into the turret mountings of the 20 pounder, facilitating for easily upgunning existing tanks equipped with the 20 pounder.
 
−
 
 
−
One 20 pounder gun was fitted to a Swiss pre-production Panzer 58, replacing a domestic 90 mm Kanone 1948 gun, before it was equipped with the 105 mm L7.
 
  
 
== Media ==
 
== Media ==
−
[[File:BP II Centurion Mk 5 1 (RAAC).png|center|Centurion Mk 5/1 (RAAC) armed with the 20pdr.]]
+
<!-- ''Excellent additions to the article would be video guides, screenshots from the game, and photos.'' -->
 +
;Videos
 +
{{Youtube-gallery|JBsxfmmBLho|'''The Shooting Range #311''' - ''Round Study'' section at 08:12 compares the rounds of the British 20-pdr cannon.}}
  
 
== See also ==
 
== See also ==
−
''Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example:''
+
<!-- ''Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example:''
 +
* ''reference to the article about the variant of the cannon/machine gun;''
 +
* ''references to approximate analogues by other nations and research trees.'' -->
  
−
* [[Centurion Mk 3]]
+
* [[Kan Strv 81 (84 mm)]] - Swedish variant
−
* [[Tank ammunition]]
 
  
 
== External links ==
 
== 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;''
 +
* ''other literature.'' -->
  
−
* [[wikipedia:Ordnance_QF_20-pounder|Wikipedia page]]
+
* [[wikipedia:Ordnance_QF_20-pounder|[Wikipedia] Ordnance QF 20-pounder]]
  
 
{{Britain tank cannons}}
 
{{Britain tank cannons}}
 +
{{Sweden tank cannons}}
 +
{{Israel tank cannons}}
  
 
[[Category:Tank cannons]]
 
[[Category:Tank cannons]]

Latest revision as of 01:28, 24 January 2023

The 20pdr OQF Mk.I (84 mm) on the Centurion Mk.5/1 gun mantlet.

Description

The 20pdr OQF Mk.I is a 84 mm British tank cannon, developed after the end of WWII to combat the Soviet IS-3. It fires a variety of conventional shells, but introduces a new subcalibre APDS round paired with a two-plane stabilizer on all but one of its implementations.

Vehicles equipped with this weapon

General info

The 20pdr is first seen on the Charioteer without a stabilizer, but it isn't until it is mounted on the many Centurion variants that it truly shines. Its APCBC round has penetration comparable to the Tiger II's , but as usual for British tanks it lacks explosive filler. The unlockable APDS Mk.3 round, however, can reliably penetrate most tanks frontally with 285 mm of penetration at point blank, with a very high velocity that can allow one to land shots at long range with a punctual consistency. Unfortunately, the great penetration and good ballistics comes at a cost as the APDS round has very poor post-penetration damage, with a narrow cone of damage and no explosive filler. One must have a very extensive knowledge of enemy crew placement or ammo rack locations to reliably eliminate enemy tanks with one shot. For a player less familiar with enemy vehicles at the battle rating, it is advised to try to incapacitate the gunner or knock out the cannon to ensure the tank will not fire back.

Available 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
Shot Mk.1 APCBC 232 229 216 201 187 173
Shot Mk.3 APDS 384 380 363 343 324 306
Shell Mk.1 HE 15 15 15 15 15 15
Shell details
Ammunition Type of
warhead 		Velocity
(m/s) 		Projectile
mass (kg) 		Fuse delay
(m) 		Fuse sensitivity
(mm) 		Explosive mass
(TNT equivalent) (kg) 		Ricochet
0% 50% 100%
Shot Mk.1 APCBC 1,000 9.1 - - - 48° 63° 71°
Shot Mk.3 APDS 1,430 3.22 - - - 75° 78° 80°
Shell Mk.1 HE 600 7.5 0.2 0.1 1.13 79° 80° 81°
Smoke shell characteristics
Ammunition Velocity
(m/s) 		Projectile
mass (kg) 		Screen radius
(m) 		Screen deploy
time (s) 		Screen hold
time (s) 		Explosive mass
(TNT equivalent) (g)
20pdr Shell SS Mk.1 250 9.3 9 5 20 50

Comparison with analogues

With the APDS rounds, the 20pdr has a penetration level similar to that of 3BM4 found on the T-62. The APCBC round's closest analogue is the PzGr. 39/43 found on the late-war German tanks such as the Tiger II and Ferdinand.

Usage in battles

Describe the cannon/machine gun in the game - its distinctive features, tactics of usage against notable opponents. Please don't write a "guide" - do not impose a single point of view, but give the reader food for thought.

Pros and cons

Pros:

  • Impressive penetration, negates most armour
  • High velocity and low drop, easy to hit moving and distant targets
  • Usually stabilized on both axis

Cons:

  • Poor post-penetration damage with all rounds

History

Examine the history of the creation and combat usage of the weapon 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 weapon and adding a block "/History" (example: https://wiki.warthunder.com/(Weapon-name)/History) and add a link to it here using the main template. Be sure to reference text and sources by using <ref></ref>, as well as adding them at the end of the article with <references />.

Media

Videos
The Shooting Range #311 - Round Study section at 08:12 compares the rounds of the British 20-pdr cannon.

See also

External links


Britain tank cannons
30 mm  L21A1
40 mm  QF 2-pounder
47 mm  Ordnance QF 3-pounder
57 mm  6pdr OQF Mk.III · 6pdr OQF Mk.V
75 mm  OQF Mk.V
76 mm  OQF 3-inch Howitzer Mk I · OQF 3in 20cwt · QF 17-pounder
77 mm  OQF Mk.II
84 mm  20pdr OQF Mk.I
94 mm  28pdr OQF · 32pdr OQF · OQF Mk.II
95 mm  Howitzer, Tank No.1, Mk.I
105 mm  LRF · Royal Ordnance L7A1
120 mm  Ordnance QF Tk. L1A2 · Ordnance BL Tk. L11 · L11A5 · L30A1
165 mm  ORD BL 6.5in L9A1
183 mm  QF L4A1
  Foreign:
25 mm  M242 (USA)
37 mm  M5 (USA) · M6 (USA)
75 mm  M2 (USA) · M3 (USA)
84 mm  kan Strv 81 (Sweden)
105 mm  Sharir (Israel)
120 mm  Rh120 L/55 A1 (Germany)
125 mm  2A46M-5 (Russia)
155 mm  M185 (USA)
  South Africa
20 mm  GI-2
76 mm  GT-4
90 mm  GT-2
105 mm  GT-3 · GT-7 · GT-8
155 mm  G6 L/45

Sweden tank cannons
20 mm  Akan m/47D · Pvlvkan m/40
37 mm  kan m/38
40 mm  akan m/70B
57 mm  Pvkan m/43
75 mm  kan m/02 · kan m/41 · kan Strv 74 · lvkan m/37 A · pvkan m/43
84 mm  kan Strv 81
90 mm  kan Ikv 91
105 mm  kan Bofors · kan Ikv · kan m/44 · kan Strv 101 · L74
120 mm  automatkanon · CTG · kan Strv 121 · kan Strv 122
150 mm  fsthaub m/02
155 mm  kan m/60
  Foreign:
35 mm  Bushmaster 3 (USA)
73 mm  2A28 (USSR)
75 mm  M3 (USA)
88 mm  KwK43 (Germany)
105 mm  L/50 (Belgium) · L7A3 (Germany)
125 mm  2A46M-1 (USSR)
155 mm  CN98 (South Korea)
  Finland
37 mm  Psv.K/36
114 mm  Psv.H/18
  Foreign:
30 mm  Bushmaster 2 Mk.44 (USA)
45 mm  20-K (USSR)
75 mm  KwK40 L48 (Germany)
76 mm  D-56TS (USSR) · F-34 (USSR) · L-10 (USSR)
77 mm  OQF Mk.II (Britain)
84 mm  20pdr OQF Mk.I (Britain)
85 mm  ZIS-S-53 (USSR)
100 mm  D-10T (USSR) · D-10T2S (USSR)
105 mm  L/50 (Belgium)
120 mm  Rh120 L/44 (Germany) · Rh120 L/55 (Germany)
125 mm  2A46 (USSR)

Israel tank cannons
30 mm  Bushmaster 2 Mk.44 (USA)
75 mm  SA50 L/57 (France)
84 mm  20pdr OQF Mk.I (UK)
90 mm  DEFA F1 (France) · M41 (USA)
100 mm  D-10T (USSR)
105 mm  M-51 (France) · M68 (USA) · Sharir
120 mm  IMI MG251
155 mm  M126 (USA) · M185 (USA) · Soltam M845

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