21inch 4-tube Bow Torpedo Launcher (Initial Model)
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No.511 21inch艦首魚雷発射管4門(初期型)
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 Submarine TorpedoEffects:
 +8  +4  ShortScrap value:
 2  2  2  2 (Buildable) | |
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| 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 |
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Introduction
米海軍で開発され、Salmon級などの潜水艦で運用された潜水艦用魚雷兵装です。
前部4門の発射管から、水上の敵艦を攻撃可能ですが、初期型の魚雷は信頼性が低く、問題もありました。
信頼性の向上した後期型では、日本の輸送船団、さらに護衛艦艇に対しても威力を発揮していきます。
A submarine torpedo developed by the US Navy and operated by Salmon-class submarines.
The four forward launch tubes are capable of attacking enemy surface ships, but early torpedoes were unreliable with various problems.
The late model, with improved reliability, will demonstrate its power against Japanese convoys and escort ships.
Mechanics
Torpedoes are almost exlusively used to trigger Night Cut-Ins, especially the Torpedo Cut-In (TCI). Their main stat is the "torpedo" 
stat.
- This stat is also used to calculate damages during the Opening Torpedo Salvo and Closing Torpedo Salvo.
Notes
How To Obtain
Buildable
Event reward for:
- Summer 2023 Event E-2: Hard (x3, choice), Medium (x2, choice), Easy (choice), Casual (choice)
Uses
Used to improve: 21inch 4-tube Bow Torpedo Launcher (Initial Model)
, 21inch 4-tube Bow Torpedo Launcher (Late Model)
Updates History
- 2023-08-09: Implemented
- 2023-11-02: Became buildable, improvable and upgradeable to 21inch 4-tube Bow Torpedo Launcher (Late Model)
Fit Bonuses
| 21inch 4-tube Bow Torpedo Launcher (Initial Model) Equipment Bonuses | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Ship | Extra Requirement | 
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Note | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Salmon-class
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(1st equipped) | +3 | +4 | One-time[1] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Gato-class 
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(1st equipped) | +1 | +2 | One-time[1] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
- ↑ 1.0 1.1 Shared with 21inch 4-tube Bow Torpedo Launcher (Late Model)
Improvement
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| Improvement | → | Conversion | ||||
| ★ Improvement Level |
0~5 | 6~9 |  21inch 4-tube Bow Torpedo Launcher (Late Model) | |||
 Consumed
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2/3 | 3/6 | 5/10 | |||
 Consumed
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2/2 | 2/3 | 4/5 | |||
| Equipment Consumed |
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x2
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 x2
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| Items Consumed |
- | - | ||||
| Resources |  60  120  50  40
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| Ship Helper | Conversion | |||||
|---|---|---|---|---|---|---|
 Salmon/Kai |
21inch 4-tube Bow Torpedo Launcher (Late Model) | |||||
| Mon | Tue | Wed | Thu | Fri | Sat | Sun |
Improvement  effects
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 Sub
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1★ | 2★ | 3★ | 4★ | 5★ | 6★ | 7★ | 8★ | 9★ | Max★ |
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0.2 | 0.4 | 0.6 | 0.8 | 1.0 | 1.2 | 1.4 | 1.6 | 1.8 | 2.0 |