[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！
Notes
How To Obtain
Upgradeable from Prototype 51cm Twin Gun Mount
From limited-time quests: 2204 B3 (choice)
Event reward for:
- Winter 2018 Event E-7: Hard, Medium
Ranking reward for:
- Jan 2022: 1-5 (★+2)
- Feb 2022: 1-5 (★+3)
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
Akashi's Improvement Arsenal
| Type | Name | ★ | Resource | Day | 2nd Ship | Note | ||||||||||||
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Sun | Mon | Tue | Wed | Thu | Fri | Sat | |||||
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51cm Twin Gun Mount | 0 | 100 | 700 | 950 | 200 | 20/25 | 7/8 | 4x
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✓ | X | X | X | X | ✓ | ✓ | Musashi Kai Ni | |
| 6 | 25/50 | 10/13 | 4x
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| 10 | - | - | - | |||||||||||||||