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Prototype 15cm 9-tube ASW Rocket Launcher

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No.288 試製15cm9連装対潜噴進砲
DepthCharge.png Depth Charge
Effects: ASW+15 Accuracy+1
Scrap value: Ammo 9 Steel 3 Bauxite 2 (Unbuildable)

Equipment Card Prototype 15cm 9-tube ASW Rocket Launcher.png

Equipment Character Prototype 15cm 9-tube ASW Rocket Launcher.png

Equipment Item Prototype 15cm 9-tube ASW Rocket Launcher.png

Equipment Full Prototype 15cm 9-tube ASW Rocket Launcher.png

Refittable Class
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

爆雷投下軌条は艦の後方、従来型の三式爆雷投射機は艦の舷側方向に爆雷を投射可能でしたが、艦首方向にも爆雷を投射可能な新対潜装備が本噴進爆雷砲です。
まだ、試作段階で欧米の同種兵装に比べて発展途上ではありますが、和製ヘッジホッグに発展する可能性もあった兵装です。

Depth charge launchers on ships' sterns and existing Type 3 depth charge projectors could throw depth charges to the sides of a ship, but this rocket launcher could throw depth charges ahead of the ship's bow as well.
This system was still a mere prototype in comparison to Western developments of similar weaponry, but it had the potential to become something akin to a Japanese-made Hedgehog.

Mechanics

Depth Charges are one of the main equipment used for ASW, being required to trigger an OASW, and greatly enhancing ASW Damage Synergy. Their main stat is "ASW" Anti-Submarine Warfare.

ASW Damage Synergy
Small SONARSmall Small Sonars
Equipment Card Type 93 Passive Sonar.png
Type 93 Passive Sonar
Equipment Card Type 4 Passive Sonar.png
Type 4 Passive Sonar
Equipment Card Type 3 Active Sonar.png
Type 3 Active Sonar
Equipment Card Type 3 Active Sonar Kai.png
Type 3 Active Sonar Kai
Equipment Card Type124 ASDIC.png
Type124 ASDIC
Equipment Card Type144 147 ASDIC.png
Type144/147 ASDIC
Equipment Card HF DF + Type144 147 ASDIC.png
HF/DF + Type144/147 ASDIC
Large SONARLarge Large Sonars
Equipment Card Type 0 Passive Sonar.png
Type 0 Passive Sonar
Depth Charge ProjectorDCP Depth Charge Projectors (DCP)
Equipment Card Type 94 Depth Charge Projector.png
Type 94 Depth Charge Projector
Equipment Card Type 3 Depth Charge Projector.png
Type 3 Depth Charge Projector
Equipment Card Type 3 Depth Charge Projector (Concentrated Deployment).png
Type 3 Depth Charge Projector (Concentrated Deployment)
Equipment Card Prototype 15cm 9-tube ASW Rocket Launcher.png
Prototype 15cm 9-tube ASW Rocket Launcher
Equipment Card RUR-4A Weapon Alpha Kai.png
RUR-4A Weapon Alpha Kai
AP
Equipment Card Mk.32 ASW Torpedo (Mk.2 Thrower).png
Mk.32 ASW Torpedo (Mk.2 Thrower)
AP
Depth Charge RacksDCR Depth Charge (Racks) (DCR)
Equipment Card Type 95 Depth Charge.png
Type 95 Depth Charge
AP
Equipment Card Type 2 Depth Charge.png
Type 2 Depth Charge
AP
Equipment Card Lightweight ASW Torpedo (Initial Test Model).png
Lightweight ASW Torpedo (Initial Test Model)
AP
Equipment Card Hedgehog (Initial Model).png
Hedgehog (Initial Model)
AP
Equipment Card Type 2 Depth Charge Kai Ni.png
Type 2 Depth Charge Kai Ni
AP
ASW MortarOther ASW Mortars
Equipment Card Type 2 12cm Mortar Kai.png
Type 2 12cm Mortar Kai
Equipment Card Type 2 12cm Mortar Kai (Concentrated Deployment).png
Type 2 12cm Mortar Kai (Concentrated Deployment)
ASW Damage Modifiers: [math]\displaystyle{ \text{Mod}_\text{synergy} }[/math]
SONAR + Depth Charges 1.15x
Depth Charge ProjectorDCP + Depth Charge RacksDCR 1.1x
Large SONARLarge + Depth Charge ProjectorDCP + Depth Charge RacksDCR 1.265xLarge SONARLarge + Depth Charges = 1.15x
Depth Charge ProjectorDCP + Depth Charge RacksDCR = 1.1x

1.15 * 1.1(1 + 0.1) = 1.265x
Small SONARSmall + Depth Charge ProjectorDCP + Depth Charge RacksDCR 1.4375xSmall SONARSmall + Depth Charge ProjectorDCP / ASW MortarOther = 1.15x
Small SONARSmall + Depth Charge RacksDCR = 1.15x
Depth Charge ProjectorDCP + Depth Charge RacksDCR = 1.1x

1.15 * 1.25(1 + 0.1 + 0.15) = 1.4375
Armor Penetration
Indepentant of synergies, some equipment provides additional armor penetration to ASW attacks.

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 Anti-Submarine Warfare stat of the applicable equipment,
    • [math]\displaystyle{ \text{Mod}_\text{ship} }[/math] being 1 for DE, 0 otherwise,
  • Armor penetration from equipment stacks,
  • The final armor of the targetted submarine cannot go below 1.

Notes

How To Obtain

From limited-time quest: Su09

Ranking reward for:

  • Nov 2021: 1-5 (★+5), 6-20 (★+4), 21-100 (★+3), 101-500 (★+2)

Event reward for:

Updates History

  • 2018-05-15: Implemented
  • 2020-01-14: Visible bonuses added

Fit Bonuses

Ship Extra Requirement Firepower Torpedo Attack Anti-Air Anti-Submarine Warfare Line of Sight Armor Evasion Note
Isuzu Kai NiIsuzu Kai Ni
Naka Kai NiNaka Kai Ni
Yura Kai NiYura Kai Ni
Yukikaze Kai NiYukikaze Kai Ni
+2 +1
Yuubari Kai Ni DYuubari Kai Ni D +1 +3 +2
Noshiro Kai NiNoshiro Kai Ni +4 +1
Katori-classKatori
Kashima
+3 +2 Added 2021-03-01

Improvement

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

See Also