8 inch/55 Mark 9 (203 mm)
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
Tell us about the tactical and technical characteristics of the cannon or machine gun.
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).
|Ammunition|| Type of
|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.17 SP Common||SP Common||137||121||99||81||68||51|
|Ammunition|| Type of
| Fuse delay
| Fuse sensitivity
| Explosive mass
(TNT equivalent) (kg)
|Mk.17 SP Common||SP Common||853||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.
After World War I, the victorious parties of the Entente Powers came to together to sign an agreement that would prevent another naval arms race like the dreadnought arms race that had preceded the Great War. As part of the negotiations, it was decided to divide cruisers between light and heavy cruisers based on the calibre of their guns. Heavy cruisers were defined as armed with 8 inch guns and a displacement of 10,000 tons, chosen to appease the British, American, and Japanese signatories who were all planning on cruisers with this calibre of guns. For the United States, their standard heavy cruiser armament became the 8 inch, fifty-five calibre guns, a built-up gun design that entered service in 1925. Weighing about 30 tons including a liner, tube, jacket, and five hoops, these guns had a down-swing Welin breech block closed by compressed air from the gas ejector system. The first ships built to mount these guns were the Lexington-class battlecruisers which had 4 twin gun turrets with the Mark 9 guns. However, the Washington Naval Treaty restrictions on constructing these types of ships led to their conversion to aircraft carriers and the cannons were repurposed as coastal defense guns on the Hawaiian Island of Oahu. Later in 1926, USS Pensacola and its sister ship Salt Lake City featured both two twin turrets and two triple turrets with the Mark 9. The following year, the Northampton and its class was built with 3 triple turrets with Mark 9 guns. In 1930, Portland and Indianapolis were built with 3 triple-turreted Mark 9s, and in 1931, the guns were fitted on the early New Orleans-class ships, the New Orleans, Minneapolis, and Astoria, before being replaced by the lighter 8 inch/55 Mark 12. The earlier ships armed with the Mark 9 would be refitted later in the war for the similar but superior 8 inch/55 Mark 14, except for Chicago, Houston, and Astoria which were sunk during the war, and Minneapolis which received the improved Mark 15 gun.
Excellent additions to the article would be video guides, 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:
- reference to the article about the variant of the cannon/machine gun;
- references to approximate analogues by other nations and research trees.
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|
|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/53 Mk.12|
|203 mm||8 inch/55 Mark 9 · 8 inch/55 Mark 12 · 8 inch/55 Mark 14|
|305 mm||12-inch/45 Mk.5 · 12 inch/50 Mk.7 · 12 inch/50 Mk.8|
|356 mm||14 inch/45 Mk.8|