View source for 2pdr QF Mk.IIc (40 mm)

[[File:2pdr QF MkIIc.png|thumb|x250px|The {{PAGENAME}} on the [[HMS Jervis]].]]
== Description ==
<!-- ''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 '''40 mm 2pdr QF Mk.IIc''', nicknamed the "'''pom-pom'''", is a British naval autocannon, used as a primary armament for coastal ships and an anti-aircraft weapon on bluewater ships.

Despite the similar name, this weapon has no relation to the [[QF 2-pounder (40 mm)|40 mm QF 2-pounder]] used on British tanks.

=== Vehicles equipped with this weapon ===
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{{Navigation-Start|Vehicles equipped with this weapon}}

{{Navigation-First-Line|'''Motor gun boats'''}}{{Specs-Link|uk_fairmile_c}}{{-}}{{Specs-Link|uk_fairmile_c_332}}{{-}}{{Specs-Link|uk_fairmile_d_601_616}}{{-}}{{Specs-Link|uk_71ft_mgb}}{{-}}{{Specs-Link|uk_sgb_304}}{{-}}{{Specs-Link|uk_sgb_309}}

{{Navigation-Line|'''Destroyers'''}}{{Specs-Link|uk_destroyer_hunt_4series}}{{-}}{{Specs-Link|uk_destroyer_j_class}}{{-}}{{Specs-Link|uk_destroyer_n_class}}{{-}}{{Specs-Link|fr_destroyer_jaguar_class_leopard}}
{{Navigation-Line|Tribal-class}}{{Specs-Link|uk_destroyer_haida}}{{-}}{{Specs-Link|uk_destroyer_tribal}}{{-}}{{Specs-Link|uk_destroyer_tribal_mohawk}}
{{Navigation-Line| }}{{Specs-Link|ussr_destroyer_kerch}}

{{Navigation-Line|'''Light cruisers'''}}{{Specs-Link|uk_minelayer_abdiel_class_abdiel}}{{-}}{{Specs-Link|uk_cruiser_enterprise_d52}}

{{Navigation-End}}

== General info ==
<!-- ''Tell us about the tactical and technical characteristics of the cannon or machine gun.'' -->
The 2pdr "pom-pom" autocannon is a 40 mm anti-air autocannon that entered service with the Royal Navy in 1917. The gun is belt-fed with 56 rounds capacity per belt and a rate of fire of 200 rounds per minute. The gun was usually found in either a single-mounted version on coastal boats and early destroyers, as well as a quad-mount version found on a British wartime destroyers.

=== 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).'' -->
The '''40 mm 2pdr QF Mk.IIc''' has 3 belt choices, Universal, 40 mm HE, and 40 mm AP.

* '''Universal:''' {{Annotation|HEF|High-explosive fragmentation}}{{-}}{{Annotation|AP-T|Armour-piercing tracer}}{{-}}{{Annotation|HEF|High-explosive fragmentation}}{{-}}{{Annotation|AP-T|Armour-piercing tracer}}
* '''40 mm HE:''' {{Annotation|HEF|High-explosive fragmentation}}{{-}}{{Annotation|HEF|High-explosive fragmentation}}{{-}}{{Annotation|HEF|High-explosive fragmentation}}{{-}}{{Annotation|AP-T|Armour-piercing tracer}}
* '''40 mm AP:''' {{Annotation|AP-T|Armour-piercing tracer}}{{-}}{{Annotation|AP-T|Armour-piercing tracer}}{{-}}{{Annotation|AP-T|Armour-piercing tracer}}{{-}}{{Annotation|HEF|High-explosive fragmentation}}

{| class="wikitable sortable" style="text-align:center" width="100%"
! colspan="7" | Penetration statistics
|-
! rowspan="2" data-sort-type="text" | Shell
! colspan="6" | Penetration @ 0° Angle of Attack (mm)
|-
! 10 m !! 100 m !! 500 m !! 1,000 m !! 1,500 m !! 2,000 m
|-
| AP-T || 60 || 57 || 48 || 39 || 32 || 26
|-
| HEF || 3 || 3 || 3 || 3 || 3 || 3
|-
|}
{| class="wikitable sortable" style="text-align:center" width="100%"
! colspan="10" | Shell details
|-
! rowspan="2" data-sort-type="text" | Ammunition
! rowspan="2" | Velocity<br>(m/s)
! rowspan="2" | Projectile<br>mass (kg)
! rowspan="2" | Fuse delay<br>(m)
! rowspan="2" | Fuse sensitivity<br>(mm)
! rowspan="2" | Explosive mass<br>(TNT equivalent) (g)
! colspan="3" | Ricochet
|-
! 0% !! 50% !! 100%
|-
| AP-T || 701 || 0.91 || N/A || N/A || N/A || 47° || 60° || 65°
|-
| HEF || 701 || 0.82 || 0 || 0.1 || 71 || 79° || 80° || 81°
|-
|}

=== Comparison with analogues ===
<!--''Give a comparative description of cannons/machine guns that have firepower equal to this weapon.''-->
* [[QF Mark V (40 mm)]]: The Bofors autocannons is mostly superior than the pom-pom in almost every way. The Bofors have a more powerful rounds, higher shell velocity, and features an auto-feeding mechanism that enable it to fire continuously. While the pom-pom technically has higher rate of fire than the Bofors (200 vs. 156 rpm), the lack of auto-feed mechanism reduces the actual rate of fire of the pom-pom to 115 rpm.

== 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.'' -->
The 2pdr pom-pom performs remarkably well for a gun originated from the Great War era. The gun has superior rate of fire than that of the famous Bofors autocannons, though it is handicapped by the lack of auto-feeding mechanism and low shell velocity which reduced the range of the guns to 3 km at best.

For the most part, the pom-pom's usage is similar to that of the Bofors, with a few distinctive differences. As the gun will never jam due to the belt-fed mechanism, the pom-pom performs better with a short but rapid burst to quickly dispatch the opponents, but the frequent reload will reduce the gun's effectiveness, especially when the enemy is getting too close. Thus, the pom-pom often requires trigger discipline at closer range to accurately hit and destroy the targets before they can attack with bombs or torpedoes.

=== 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:'''

* Powerful HE rounds
* High rate of fire
* Belt-fed mechanism ensure that the gun will never jam

'''Cons:'''

* Low muzzle velocity limits its effective range
* Lacks autoloading mechanism, have to reload semi-frequently

== 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>.''

== Media ==
''Excellent additions to the article would be video guides, screenshots from the game, and photos.''

== 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 article about the variant of the cannon/machine gun;''
* ''references to approximate analogues by other nations and research trees.'' -->

* [[2pdr QF Mk.VIII (40 mm)]] - Later variant of the weapon
* [[40 mm/62 Vickers (40 mm)]] - Japanese version
* [[40 mm/39 Vickers-Terni mod.1915/1917 (40 mm)]]{{-}}[[40 mm/39 Vickers-Terni mod.1915/1917, Modif.1930 (40 mm)]] - Italian licensed versions

== External links ==
<!-- ''Paste links to sources and external resources, such as:''
* ''topic on the official game forum;''
* ''other literature.'' -->

* [http://www.navweaps.com/Weapons/WNBR_2pounder_m2.php <nowiki>[NavWeaps]</nowiki> 2-pdr <nowiki>[4 cm/39 (1.575")]</nowiki> QF Mark II, Mark II* and Mark II*C] ([https://web.archive.org/web/20210731184850/http://www.navweaps.com/Weapons/WNBR_2pounder_m2.php Web Archive])

{{USSR naval cannons}}
{{Britain naval cannons}}
{{France naval cannons}}

[[Category:Naval cannons]]