15.5cm Triple Secondary Gun Mount
[Edit]
No.12 15.5cm三連装副砲
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 Secondary GunEffects:
 +7  +3  +2  MediumScrap value:
 2  5 (Buildable) | |
Alternate names
Card name: 15.5cm Triple Gun Mount (Secondary Gun)
15.5cm三連装砲（副砲） | |
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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
巡洋艦の主砲だったものを、戦艦の副砲として活用しました。
「大和」型に搭載され、対空戦も可能な、性能・運用ともに優秀な戦艦副砲となりました。
砲塔部の装甲が薄いのが玉に傷で、諸説ありますが「大和」型の唯一の弱点という指摘もありました。
Although designed to be a part of the cruiser's main battery, it saw a more practical use as the battleship's secondary armament.
The "Yamato-class" was designed with this, for potential use as an anti-aircraft gun, however, its combined ability and performance were outstanding enough to be used as the battleship's secondary armament.
However, the turret section's armor was very thin, resulting in various rumors about it being the Yamato-class' Achilles' heel when pointed out.
Mechanics
Secondary Guns
Sec Sp_Sec serve a similar role to Main Guns. Their main stats are the "firepower" 
and "accuracy" 
. They are notably required to trigger some weaker Artillery Spotting attacks as well as some Night Cut-Ins, notably the "Double Attack" (DA).
- They do not have any "Hidden Penalties" on any ships.
- They bring an accuracy bonus against PT boats.
Can be equipped in the RE of certain ships.
Notes
How To Obtain
Buildable
Stock equipment of: Haruna Kai
, Hiei Kai
, Kirishima Kai
, Kongou Kai
, Musashi
, Yamato
From quest: Cy9 (x2, choice)
Uses
Used to improve: 15.5cm Triple Secondary Gun Mount
, 15.5cm Triple Secondary Gun Mount Kai
, 15.5cm Triple Gun Mount Kai
, 15.2cm Triple Gun Mount
Updates History
- 2013-04-23: Implemented with initial game release
- 2017-06-23: Became improvable and upgradeable to 15.5cm Triple Secondary Gun Mount Kai
- 2022-05-27: Became possible to equip in Yamato-class Kai Ni's expansion slots
- 2022-06-08: Visible bonuses added
Fit Bonuses
| 15.5cm Triple Secondary Gun Mount Equipment Bonuses | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Ship | Extra Requirement |
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Note | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Yamato-class
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- | +1 | +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 | +1 | One-time | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Improvement
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| Improvement | → | Conversion | ||||
| ★ Improvement Level |
0~5 | 6~9 |  15.5cm Triple Secondary Gun Mount Kai | |||
 Consumed
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2/2 | 2/3 | 8/12 | |||
 Consumed
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2/3 | 2/4 | 4/8 | |||
| Equipment Consumed |
- | 
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x2
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| Items Consumed |
- | 
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| Resources |  10  90  120  0
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| Ship Helper | Conversion | |||||
|---|---|---|---|---|---|---|
 Yamato/Kai/Ni/Juu |
15.5cm Triple Secondary Gun Mount Kai | |||||
| Mon | Tue | Wed | Thu | Fri | Sat | Sun |
 Musashi | ||||||
| Mon | Tue | Wed | Thu | Fri | Sat | Sun |
 Musashi Kai | ||||||
| Mon | Tue | Wed | Thu | Fri | Sat | Sun |
 Musashi Kai Ni | ||||||
| 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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0.3 | 0.6 | 0.9 | 1.2 | 1.5 | 1.8 | 2.1 | 2.4 | 2.7 | 3.0 |
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0.3 | 0.6 | 0.9 | 1.2 | 1.5 | 1.8 | 2.1 | 2.4 | 2.7 | 3.0 |
| 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 |
Trivia
According to here, the Mogami-class and eventually the Tone-class were supposed to have the gun, but when the practical use was seen in Yamato-class and Oyodo, it then remained as part of the battleship's main weaponry. One factor for the gun design change was that the gun was supposed to have an additional 75 ° for AA firing on top of the main 45 degrees for general firing, but this was switched to +55 degrees for the reasoning that it was too inefficient.
The "Achilles' heel" portion refers to the relatively inferior armor thickness of the turret part, albeit being colossally improved compared to casemate guns of other Japanese battleships (Fuso-class to Nagato-class).