20pdr OQF Mk.I (84 mm)

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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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