21cm Single Main Gun Mount
[Edit]
No.564 21cm単装主砲
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 Medium Caliber Main GunEffects:
 +6  +1  MediumScrap value:
 3  3 (Unbuildable) | |
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| Refittable Ship Types | |
| Fast Battleship | Battleship |
| Aviation Battleship | Standard Aircraft Carrier |
| Armored Carrier | Light Carrier |
| Heavy Cruiser | Aviation Cruiser |
| Light Cruiser | Torpedo Cruiser |
| Training Cruiser | Destroyer |
| Coastal Defense Ship | Submarine |
| Aircraft Carrying Submarine | Seaplane Tender |
| Fleet Oiler | Submarine Tender |
| Repair Ship | Amphibious Assault Ship |
Introduction
紅茶の国で建造された、当時のノルウェーの最大海上戦力となる海防戦艦に搭載された、中口径主砲兵装です。
交戦当時の水準で見ると旧式化は否めませんが、就役当時は沿岸防衛戦闘艦としては十分な火力でした。
今次戦闘では、if近代化改装を施して運用してまいりましょう。
This is a medium-caliber main gun armament that was installed on a coastal defense battleship, built in the country of tea, which at the time represented Norway's largest naval force.
While undeniably outdated by the standards of the time of the conflict, it possessed sufficient firepower as a coastal defense warship when it was first commissioned.
In this battle, it will be operated on board ships after implementing what-if modernization modifications.
Mechanics
Main Guns
are the main armament used by surface ships. Their main stats are the "firepower" 
and "accuracy" 
. They are notably required to trigger all Artillery Spotting attacks as well as some Night Cut-Ins, notably the "Double Attack" (DA).
- Most main guns come with "Hidden Fit Bonuses/Penalties", especially larger ones.
Notes
How To Obtain
Stock equipment of:
- Base: Norge
, Eidsvold
- Kai+: Norge Kai
, Eidsvold Kai
Event reward for:
- Fall 2025 Event E-1: Hard (★+8), Medium (★+7), Easy (★+3)
Updates History
- 2025-10-29: Implemented
Fit Bonuses
| 21cm Single Main Gun Mount Equipment Bonuses | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Ship | Extra Requirement |
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Note | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Norge-class Yuubari (any)     
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(★0-6) | +2 | +1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| (★7) | +3 | +1 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| (★8) | +3 | +2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| (★9) | +4 | +2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| (★MAX) | +4 | +3 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| (2nd equipped) | +2 | One-time | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
+ 15cm Single Secondary Gun Mount
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+1 | +1 | One-time | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Improvement
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| Improvement | Not Upgradable | |||||
| ★ Improvement Level |
0~5 | 6~9 | ||||
 Consumed
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4/5 | 5/6 | ||||
 Consumed
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1/2 | 1/3 | ||||
| Equipment Consumed |
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x3
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| Items Consumed |
- | |||||
| Resources |  10  60  90  0
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| Ship Helper | Conversion | |||||
|---|---|---|---|---|---|---|
 Norge/Kai |
- | |||||
| Mon | Tue | Wed | Thu | Fri | Sat | Sun |
Improvement  effects
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1★ | 2★ | 3★ | 4★ | 5★ | 6★ | 7★ | 8★ | 9★ | Max★ |
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1.00 | 1.41 | 1.73 | 2.00 | 2.23 | 2.44 | 2.64 | 2.82 | 3.00 | 3.16 |
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1.00 | 1.41 | 1.73 | 2.00 | 2.23 | 2.44 | 2.64 | 2.82 | 3.00 | 3.16 |
| Day
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1.00 | 1.41 | 1.73 | 2.00 | 2.23 | 2.44 | 2.64 | 2.82 | 3.00 | 3.16 |
| Night
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1.30 | 1.84 | 2.25 | 2.60 | 2.91 | 3.18 | 3.44 | 3.68 | 3.90 | 4.11 |