15.5cm Triple Secondary Gun Mount

	[Edit] 15.5cm Triple Secondary Gun Mount No.12 15.5cm三連装副砲
	Secondary Gun Effects: +7 +3 +2 Medium Scrap value: 2 5 (Buildable)
	Alternate names Card name: 15.5cm Triple Gun Mount (Secondary Gun); 15.5cm三連装砲（副砲）
	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: C66 (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
2022-06-01: 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
Ship	Extra Requirement				Note
Yamato-class	-	+1	+1	+1
Yamato-class	+ 15m Duplex Rangefinder + Type 21 Radar Kai 2 OR 15m Duplex Rangefinder Kai + Type 21 Radar Kai 2 + Skilled Fire Direction Center		+1	+1	One-time

Improvement

Type	Name	★	Resource							Day							2nd Ship	Note
Type	Name	★								Sun	Mon	Tue	Wed	Thu	Fri	Sat	2nd Ship	Note
	15.5cm Triple Gun Mount (Secondary)	0	10	90	120	0	2/2	2/3	-	M	X	X	X	X	Y M	Y M	Yamato Musashi	Musashi Kai Ni can NOT improve this gun. Upgrades to 15.5cm Triple Gun Mount Kai (Secondary).
		6					2/3	2/4	1x
		10					8/12	4/8	2x 1x

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.3	0.6	0.9	1.2	1.5	1.8	2.1	2.4	2.7	3.0
	0.3	0.6	0.9	1.2	1.5	1.8	2.1	2.4	2.7	3.0
Day	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
Night	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 degrees 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).