51cm Twin Gun Mount
[Edit]
No.281 51cm連装砲
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 Large Caliber Main Gun (II) (51 cm)Effects:
 +32  +5  +2  +1  -1  Very LongScrap value:
 30  28 (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
大和型戦艦の発展強化型への搭載が検討されていた大口径大型用戦艦主砲、その完成版です。
最大最強の艦艇搭載用砲熕兵装となる本砲は、改装強化された大和型等で運用可能です。
実戦配備されることのなかった本砲で、海原で一斉射を！
This is the finished version of the large-caliber main gun that was intended to be installed on the upgraded Yamato-class that was in development.
It is the largest and most powerful naval artillery in existence. It can be used by the remodeled Yamato-class and other ships.
Though it has never been used in combat, go forth and fire a volley upon the sea!
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
Upgradeable from: Prototype 51cm Twin Gun Mount
From limited-time quest: 2204 B3 (choice)
Ranking reward for:
- Jan 2022: 1-5 (★+2)
- Feb 2022: 1-5 (★+3)
- Nov 2023: 1-5 (★+4), 6-20 (★+4), 21-100 (★+2), 101-500
Event reward for:
- Winter 2018 Event E-7: Hard, Medium
Updates History
- 2018-02-17: Implemented
- 2018-03-23: Became improvable
- 2022-06-08: Visible bonuses added
Fit Bonuses
| 51cm Twin Gun Mount Equipment Bonuses | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Ship | Extra Requirement |
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Note | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Yamato Kai Ni /Juu  Musashi Kai Ni 
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- | +1 | +1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
+ 15m Duplex Rangefinder + Type 21 Radar Kai 2 OR 15m Duplex Rangefinder Kai + Type 21 Radar Kai 2 + Skilled Fire Direction Center
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+1 | +2 | One-time[1] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| + 15m Duplex Rangefinder Kai + Type 21 Radar Kai 2 + Skilled Fire Direction Center
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+1 | +1 | One-time[1] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Other Yamato-class 
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+ 15m Duplex Rangefinder + Type 21 Radar Kai 2 OR 15m Duplex Rangefinder Kai + Type 21 Radar Kai 2 + Skilled Fire Direction Center
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+1 | +2 | One-time[1] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
- ↑ 1.0 1.1 1.2 Shared with Prototype 51cm Twin Gun Mount
Improvement
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| Improvement | Not Upgradable | |||||
| ★ Improvement Level |
0~5 | 6~9 | ||||
 Consumed
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20/25 | 25/50 | ||||
 Consumed
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7/8 | 10/13 | ||||
| Equipment Consumed |
 x4
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 x4
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| Items Consumed |
- | |||||
| Resources |  100  700  950  200
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| Ship Helper | Conversion | |||||
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 Musashi Kai Ni |
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| 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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1.50 | 2.12 | 2.59 | 3.00 | 3.35 | 3.67 | 3.96 | 4.24 | 4.50 | 4.74 |
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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 |