Hedgehog (Initial Model)

[Edit] Hedgehog (Initial Model) No.439 Hedgehog(初期型)
Depth Charge Effects: -1 +18 +3 Scrap value: 1 13 1 2 (Unbuildable)
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

紅茶の国が開発した強力な対潜兵装です。
対潜爆雷に代替する次世代の対潜兵装として開発された、前方投射式の多弾散布型の対潜迫撃砲です。
ハリネズミと呼ばれたこの革新的な新型対潜兵装は、比較的シンプルな構造でありながら対潜戦闘に大きな進化をもたらし、改良を施されつつ戦後の艦艇にも装備運用されていきます。

A powerful anti-submarine weapon developed by the Country of Tea.
It's a next-generation anti-submarine weapon designed to replace depth charges. It's a forward-projecting multi-round anti-submarine mortar.
This innovative new anti-submarine weapon is known as the Hedgehog. It has a simple construction but it's a revolution in anti-submarine warfare. After some upgrades, it was deployed aboard post-war ships.

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 Kai 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 Type 2 Depth Charge Kai Ni AP Lightweight ASW Torpedo (Initial Test Model) AP Hedgehog (Initial Model) 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

From quest: F112

Ranking reward for:

• Sep 2021: 1-5
• Dec 2021: 1-5 (★+2), 6-20, 21-100, 101-500

Event reward for:

• Fall 2021 Event E-1: Hard (★+2), Medium

Updates History

• 2021-10-29: Implemented as Event Reward

Fit Bonuses

Hedgehog (Initial Model) Equipment Bonuses
Ship	Extra Requirement									Note
United States Navy Vessels Royal Navy Vessels	(1st equipped)				+3				+1	One-time
All DE Matsu-class	(1st equipped)				+2				+1	One-time
Other DD Other CL All CT	(1st equipped)				+1				+1	One-time

Improvement

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
	1.00	1.41	1.73	2.00	2.23	2.44	2.64	2.82	3.00	3.16
ASW	1.30	1.83	2.25	2.60	2.90	3.18	3.43	3.67	3.90	4.11