21inch 4-tube Bow Torpedo Launcher (Late Model)
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No.512 21inch艦首魚雷発射管4門(後期型)
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 Submarine TorpedoEffects:
 +12  +3  +5  ShortScrap value:
 2  3  2  2 (Unbuildable) | |
.png) .png) .png) .png) | |
| 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
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、数々のチャンスを逸しています。
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、日本の継戦能力を削っていきます。
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 and missed many opportunities.
The late model, with improved reliability, will demonstrate its power against Japanese convoys and escort ships, and will reduce Japan's ability to continue fighting.
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.
When used by themselves or together with 
Submarine Equipment, late-model submarine torpedoes can trigger Night Cut-Ins that have higher damage modifiers than the usual Torpedo Cut-In.
| Torpedo Cut-In modifiers | |||||
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| Attack Type | Prerequisites | Notes | Pre-cap Damage Modifier |
Accuracy Modifier |
Hits |
| Submarine Cut-ins | Sub_LM
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With Late-Model Sub Torps ONLY | 1.75 | ? | 2 |
| Sub_LM Sub_LM
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1.6 | ||||
Notes
How To Obtain
Stock equipment of: Salmon Kai
Upgradeable from: 21inch 4-tube Bow Torpedo Launcher (Initial Model)
Updates History
- 2023-08-09: Implemented
- 2023-11-02: Became improvable; bug fix: is finally late-model sub torp
Fit Bonuses
| 21inch 4-tube Bow Torpedo Launcher (Late Model) Equipment Bonuses | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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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 (Initial Model)
Improvement
| Type | Name | ★ | Resource | Day | 2nd Ship | Note | ||||||||||||
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Sun | Mon | Tue | Wed | Thu | Fri | Sat | |||||
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21inch 4-tube Bow Torpedo Launcher (Late Model) | 0 | 70 | 130 | 60 | 50 | 5/? | 3/? | ? | S | X | S | S | Salmon
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| 6 | ? | ? | ? | |||||||||||||||
| 10 | - | - | - | |||||||||||||||
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 |