Difference between revisions of "8 inch/55 Mark 12 (203 mm)"

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m (→‎History: Correction. The Washington Naval Treaty was signed in 1922 but negotiated in 1921.)
 
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=== Available ammunition ===
 
=== Available ammunition ===
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''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).''
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<!-- ''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).'' -->
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{| class="wikitable sortable" style="text-align:center" width="100%"
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{{:{{PAGENAME}}/Ammunition|8 inch Mk.14 Common, 8 inch Mk.21 APCBC, 8 inch Mk.25 HC, 8 inch Mk.17 SP Common}}
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! colspan="8" | Penetration statistics
 
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|-
 
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! rowspan="2" data-sort-type="text" | Ammunition
 
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! rowspan="2" | Type of<br>warhead
 
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! colspan="6" | Penetration @ 0° Angle of Attack (mm)
 
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|-
 
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! 1,000 m !! 2,500 m !! 5,000 m !! 7,500 m !! 10,000 m !! 15,000 m
 
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|-
 
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| Mk.14 Common || Common || 110 || 98 || 80 || 66 || 56 || 43
 
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|-
 
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| Mk.21 APCBC || APCBC || 390 || 348 || 289 || 243 || 207 || 165
 
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|-
 
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| Mk.25 HC || HE || 61 || 61 || 61 || 61 || 61 || 61
 
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|-
 
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| Mk.17 SP Common || SP Common || 131 || 116 || 95 || 79 || 66 || 50
 
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|-
 
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|}
 
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{| class="wikitable sortable" style="text-align:center" width="100%"
 
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! colspan="10" | Shell details
 
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|-
 
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! rowspan="2" data-sort-type="text" | Ammunition
 
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! rowspan="2" | Type of<br>warhead
 
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! rowspan="2" | Velocity<br>(m/s)
 
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! rowspan="2" | Projectile<br>mass (kg)
 
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! rowspan="2" | Fuse delay<br>(s)
 
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! rowspan="2" | Fuse sensitivity<br>(mm)
 
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! rowspan="2" | Explosive mass<br>(TNT equivalent) (kg)
 
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! colspan="3" | Ricochet
 
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|-
 
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! 0% !! 50% !! 100%
 
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|-
 
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| Mk.14 Common || Common || 823 || 117.9 || 0.035 || 9 || 4.84 || 47° || 60° || 65°
 
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|-
 
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| Mk.21 APCBC || APCBC || 762 || 151.9 || 0.035 || 9 || 2.21 || 48° || 63° || 71°
 
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|-
 
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| Mk.25 HC || HE || 823 || 117.9 || 0 || 0.1 || 9.5 || 79° || 80° || 81°
 
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|-
 
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| Mk.17 SP Common || SP Common || 823 || 117.9 || 0.035 || 9 || 4.61 || 48° || 63° || 71°
 
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|-
 
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|}
 
  
 
=== Comparison with analogues ===
 
=== Comparison with analogues ===
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== 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>.'' -->
 
<!-- ''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>.'' -->
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The Washington Naval Treaty signed in 1921 maintained that heavy cruisers would be armed with 8 inch guns. The United States Navy first created the [[8 inch/55 Mark 9 (203 mm)|8 inch/55 Mark 9]] guns for their heavy cruisers, but they were heavier and bulkier compared to the 8 inch guns of the other signatory nations. As a result, the 8 inch, 55 calibre Mark 12 gun was created as a more lightweight alternative. With a chromium-lined barrel to increase the life of the barrel, the Mark 12 removed the construction hoops to bring the weight to 17 tons from the Mark 9's 30 tons. There were two mountings for the Mark 12. The first was the ''Tuscaloosa'' sub-class of the [[USS New Orleans|''New Orleans''-class]], which used the same triple mountings as the Mark 9, but had a lower revolving weight. To decrease the shell dispersion and improve accuracy, the USS ''Wichita'' and [[USS Baltimore|USS ''Baltimore'']] mounted individually sleeved guns in further spaced twin turrets. The Mark 12 would eventually give way to the Mark 15 which had a slightly smaller chamber and different rifling twist that would enter service first on the ''Baltimore''<nowiki/>'s sister ships.
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The Washington Naval Treaty signed in 1922 maintained that heavy cruisers would be armed with 8 inch guns. The United States Navy first created the [[8 inch/55 Mark 9 (203 mm)|8 inch/55 Mark 9]] guns for their heavy cruisers, but they were heavier and bulkier compared to the 8 inch guns of the other signatory nations. As a result, the 8 inch, 55 calibre Mark 12 gun was created as a more lightweight alternative. With a chromium-lined barrel to increase the life of the barrel, the Mark 12 removed the construction hoops to bring the weight to 17 tons from the Mark 9's 30 tons. There were two mountings for the Mark 12. The first was the ''Tuscaloosa'' sub-class of the [[USS New Orleans|''New Orleans''-class]], which used the same triple mountings as the Mark 9, but had a lower revolving weight. To decrease the shell dispersion and improve accuracy, the USS ''Wichita'' and [[USS Baltimore|USS ''Baltimore'']] mounted individually sleeved guns in further spaced twin turrets. The Mark 12 would eventually give way to the Mark 15 which had a slightly smaller chamber and different rifling twist that would enter service first on the ''Baltimore''<nowiki/>'s sister ships.
  
 
== Media ==
 
== Media ==
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== 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;''
 
* ''topic on the official game forum;''
 
* ''other literature.''
 
* ''other literature.''

Latest revision as of 16:27, 14 March 2024

8 inch/55 Mark 12 cannons on the USS Baltimore

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.

Vehicles equipped with this weapon

General info

Tell us about the tactical and technical characteristics of the cannon or machine gun.

Available ammunition

Penetration statistics
Ammunition Type of
warhead 		Penetration @ 0° Angle of Attack (mm)
1,000 m 2,500 m 5,000 m 7,500 m 10,000 m 15,000 m
Mk.14 Common Common 110 98 80 66 56 43
Mk.21 APCBC APCBC 390 348 289 243 207 165
Mk.25 HC HE 61 61 61 61 61 61
Mk.17 SP Common SP Common 131 116 95 79 66 50
Shell details
Ammunition Type of
warhead 		Velocity
(m/s) 		Projectile
mass (kg) 		Fuse delay
(s) 		Fuse sensitivity
(mm) 		Explosive mass
(TNT equivalent) (kg) 		Ricochet
0% 50% 100%
Mk.14 Common Common 823 117.9 0.035 9 4.84 47° 60° 65°
Mk.21 APCBC APCBC 762 151.9 0.035 9 2.21 48° 63° 71°
Mk.25 HC HE 823 117.9 0 0.1 9.49 79° 80° 81°
Mk.17 SP Common SP Common 823 117.9 0.035 9 4.61 48° 63° 71°

Comparison with analogues

Give a comparative description of cannons/machine guns that have firepower equal to this weapon.

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

Summarise and briefly evaluate the weaponry in terms of its characteristics and combat effectiveness. Mark pros and cons as a list.

Pros:

Cons:

History

The Washington Naval Treaty signed in 1922 maintained that heavy cruisers would be armed with 8 inch guns. The United States Navy first created the 8 inch/55 Mark 9 guns for their heavy cruisers, but they were heavier and bulkier compared to the 8 inch guns of the other signatory nations. As a result, the 8 inch, 55 calibre Mark 12 gun was created as a more lightweight alternative. With a chromium-lined barrel to increase the life of the barrel, the Mark 12 removed the construction hoops to bring the weight to 17 tons from the Mark 9's 30 tons. There were two mountings for the Mark 12. The first was the Tuscaloosa sub-class of the New Orleans-class, which used the same triple mountings as the Mark 9, but had a lower revolving weight. To decrease the shell dispersion and improve accuracy, the USS Wichita and USS Baltimore mounted individually sleeved guns in further spaced twin turrets. The Mark 12 would eventually give way to the Mark 15 which had a slightly smaller chamber and different rifling twist that would enter service first on the Baltimore's sister ships.

Media

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

See also

External links

Paste links to sources and external resources, such as:

  • topic on the official game forum;
  • other literature.


USA naval cannons
20 mm  20 mm/70 Oerlikon Mk.II · 20 mm/70 Oerlikon Mark V · 20 mm/70 Oerlikon Mark 24
25 mm  25 mm/87 Mk.38
28 mm  1.1 inch/75 Mk.1
37 mm  AN-M4
40 mm  Bofors L/60 Mark 1 · Bofors L/60 Mark 2 · Bofors L/60 Mark 3
76 mm  3 inch/23 Mk.4 · 3-inch/50 Mk.10 · 3-inch/70 Mk.37 · 3-inch Mark 10 · 3 inch Mk.33 · 3-inch Mk.34
102 mm  4 inch/50 Mk.9
127 mm  5 inch/25 Mk.11 · 5 inch/25 Mk.13 AA · 5 inch/38 Mk.12 · 5-inch/50 Mk.5 · 5 inch/51 Mk.7 · 127 mm/54 Mark 18
152 mm  6 inch/47 Mk.16 · 6 inch/47 DP Mk.16 · 6 inch/53 Mk.12 · M81
203 mm  8 inch/55 Mark 9 · 8 inch/55 Mark 12 · 8 inch/55 Mark 14 · 8 inch/55 Mark 16
305 mm  12-inch/45 Mk.5 · 12 inch/50 Mk.7 · 12 inch/50 Mk.8
356 mm  14 inch/45 Mk.8 · 14 inch/45 Mk.12 · 14 inch/50 Mk.11

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