Type 2 Depth Charge

[Edit] Type 2 Depth Charge No.227 二式爆雷
Depth Charge Effects: +7 Scrap value: 1 3 1 (Unbuildable)
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

対潜水艦に使用する増加爆雷装備です。爆雷は戦訓を踏まえ、改良されています。
駆逐艦や海防艦などに爆雷投射機やソナー類などの対潜装備ともに装備することで、対潜能力の向上が図れます。

This is additional depth charge equipment for use in anti-submarine actions. The depth charges have been improved from wartime testing.
When equipped in combination with depth charge projectors, sonar, and such anti-submarine equipment on Destroyers, Coastal Defense Ships, and the like, anti-submarine ability will increase.

Mechanics

Depth Charges are one of the main equipment used for ASW, greatly enhancing ASW Damage Synergy. Their main stat is "ASW" .

ASW Damage Synergy
Small Small Sonars	Type 93 Passive Sonar Type 4 Passive Sonar Type 3 Active Sonar Type 3 Active Sonar Kai Type124 ASDIC Type144/147 ASDIC HF/DF + Type144/147 ASDIC
Large Large Sonars	Type 0 Passive Sonar
DCP Depth Charge Projectors (DCP)	Type 94 Depth Charge Projector Type 3 Depth Charge Projector Type 3 Depth Charge Projector (Concentrated Deployment) Prototype 15cm 9-tube ASW Rocket Launcher RUR-4A Weapon Alpha Kai AP Mk.32 ASW Torpedo (Mk.2 Thrower) AP
DCR Depth Charge (Racks) (DCR)	Type 95 Depth Charge AP Type 2 Depth Charge AP Lightweight ASW Torpedo (Initial Test Model) AP Hedgehog (Initial Model) AP Type 2 Depth Charge Kai Ni AP
Other ASW Mortars	Type 2 12cm Mortar Kai Type 2 12cm Mortar Kai (Concentrated Deployment)
ASW Damage Modifiers: [math]\displaystyle{ \text{Mod}_\text{synergy} = {Mod}_\text{1} \times {Mod}_\text{2} }[/math]
[math]\displaystyle{ {Mod}_\text{1} }[/math]	+ (Any Sonar + Any Depth Charge)	1.15
[math]\displaystyle{ {Mod}_\text{2} }[/math]	DCP + DCR and NO Small	1.1
	Small + DCP + DCR	1.25
Examples
[math]\displaystyle{ \text{Mod}_\text{synergy} }[/math]	Small + DCP + DCR	1.4375[math]\displaystyle{ 1.15 \times 1.25 }[/math]
	Large + DCP + DCR	1.265[math]\displaystyle{ 1.15 \times 1.1 }[/math]
Armor Penetration
Indepentant of synergies, some equipment provides additional armor penetration to ASW attacks. The affected equipment are: DCR: Type 95 DC, Type 2 DC, Lightweight ASW Torpedo, Hedgehog, Type 2 DC K2 DCP: RUR-4A Weapon Alpha Kai, Mk.32 ASW Torpedo (Mk.2 Thrower). The flat armor penetration value is calculated as follows: [math]\displaystyle{ \text{Pen} = \sum\limits_{\text{Equipment}} \Big( \sqrt{\text{ASW}_\text{Equipment} - 2} + \text{Mod}_\text{ship} \Big) }[/math] With [math]\displaystyle{ \text{ASW}_\text{Equipment} }[/math] the base ASW stat of the applicable equipment, Visible Bonuses and Improvements are not counted here. [math]\displaystyle{ \text{Mod}_\text{ship} }[/math] being 1 for DE, 0 otherwise, Note Armor penetration from equipment stacks, The final armor of the targetted submarine cannot go below 1.

Notes

How To Obtain

Stock equipment of: Akigumo Kai Ni (★+7)

Upgradeable from: Type 95 Depth Charge

From quest: By2 (choice), By6 (x2, choice), B140 (x2, choice), C23 (choice), C27 (choice)

From limited-time quest: 21Su LB3 (x3, choice), 2101 LQ1 (x2, choice), SB28 (x2, choice), S (x2, choice), SB50 (x2, choice), SB54 (x2, choice), Su08, 2110 LB02 (x3, choice), 2112 LB02 (x2, choice), 22Fa LB05 (x3, choice)

Event reward for:

• Spring 2017 Event E-2: Hard, Medium
• Summer 2017 Event E-2: Hard, Medium
• Fall 2017 Event E-2: Hard, Medium
• Winter 2018 Event E-2: Hard
• Fall 2021 Event E-2: Hard (★+4), Medium (★+4), Easy (★+4), Casual (★+4)

Uses

Used to improve: Type 2 Depth Charge

Updates History

• 2017-05-02: Implemented
• 2022-08-04: Became improvable

Improvement

Type	Name	★	Resource							Day							2nd Ship	Note
										Sun	Mon	Tue	Wed	Thu	Fri	Sat
	Type 2 Depth Charge	0	10	110	10	80	4/5	2/2	1x	Y	H D	H D	M     H	M   K	M Y K	Y K	Mikura Kai Yashiro Kai Kurahashi Kai Hiburi Kai Daitou Kai
		6					5/6	3/4	1x
		10					-	-	-

Improvement effects
	1★	2★	3★	4★	5★	6★	7★	8★	9★	Max★
	0.75	1.06	1.29	1.50	1.67	1.83	1.98	2.12	2.25	2.37
	0.67	0.94	1.15	1.33	1.49	1.63	1.76	1.89	2.00	2.11