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)
	Refittable Ship Types
Coastal Defense Ship	Destroyer
Light Cruiser	Torpedo Cruiser
Heavy Cruiser	Training Cruiser
Aviation Cruiser	Fast Battleship
Battleship	Aviation Battleship
Light Carrier	Standard Aircraft Carrier
Armored Carrier	Seaplane Tender
Submarine	Aircraft Carrying Submarine
Submarine Tender	Fleet Oiler
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 Imps.

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

Ship	Extra Requirement								Note
Yamato-class		+1						+1	+1
Yamato-class	+ 15m Duplex Rangefinder + Type 21 Radar Kai Ni OR 15m Duplex Rangefinder Kai + Type 21 Radar Kai Ni + Skilled Fire Direction Center							+1	+1, One-time

Improvement

15.5cm Triple Secondary Gun Mount
Improvement			→	Conversion
★ Improvement Level	0~5	6~9		15.5cm Triple Secondary Gun Mount Kai
Consumed	2/2	2/3		8/12
Consumed	2/3	2/4		4/8
Equipment Consumed	-			x2
Items Consumed	-
Resources	10 90 120 0

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
	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).