[Edit]
Sikorsky H-5
No.326 S-51J
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 RotorcraftEffects:
 +2  +12  +2  +3Combat Radius: 2 (Deployment Cost:
 5)Scrap value:
 2  3 5 (Unbuildable) | |
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| 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 |
| LBAS Plane | |
Introduction
時代はオートジャイロから、ヘリコプターへ。
あの時代に原型機が既に初飛行を実現、哨戒や連絡などを中心に実用化が始まっていた回転翼機、初期のヘリコプターです。
戦後、海上自衛隊にも導入された同機のif対潜哨戒型の艦載ヘリです。
The autogyro has now evolved into the helicopter.
his is an early helicopter, whose prototype had already flown, and had begun to be used for patrol and communication purposes.
This is a what-if version that might have been introduced to the Maritime Self-Defense Force after the war.
Mechanics
Rotorcraft are ASW Aircraft, being used to trigger some OASW and Land-based ASW attacks.
As they do not have any Dive Bombing 
stat, they do not participate to Phases 2 & 3 of Aerial Combat and are immune to shootdown. They:
- Will launch during aerial battle if other planes are launched, but cannot start an aerial battle on their own.
- Allow BBV, CAV, AV, and LHA to perform ASW attacks.
- CVL and Kaga Kai Ni Go equipped with them will still require a
Dive Bomber or a 
Torpedo Bomber to attack submarines, as they are unable to attack anything without a bomber. - AS, AR, and some CVB can equip them, but the former cannot attack SS, and the latter has a carrying capacity of 0 so they do not function.
- AO can equip them, but their attack animation will still be a depth charge animation.
Their LBAS Combat Radius cannot be extended.
Notes
How To Obtain
Upgradeable from: O Type Observation Autogyro Kai Ni
From quest: B132 (choice)
Updates History
- 2019-03-27: Implemented
- 2020-08-27: Visible bonuses increased
Fit Bonuses
| S-51J Equipment Bonuses | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Ship | Extra Requirement | 
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Kaga Kai Ni Go
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- | +3 | +5 | +3 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Hyuuga Kai Ni
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- | +3 | +4 | +2 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Ise Kai Ni
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- | +1 | +3 | +1 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Additional synergy with: TBM-3W+3S
| Rotorcraft Type Equipment Bonuses | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Ship | Extra Requirement |
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Noshiro Kai Ni
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(1st equipped) | +4 | +1 | One-time[1] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Yahagi Kai Ni /B 
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(1st equipped) | +3 | +1 | One-time[1] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
- ↑ 1.0 1.1 Shared with all Rotorcraft
Improvement
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| Improvement | → | Conversion | ||||
| ★ Improvement Level |
0~5 | 6~9 |  S-51J Kai | |||
 Consumed
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8/9 | 9/10 | 50/80 | |||
 Consumed
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7/7 | 7/9 | 10/20 | |||
| Equipment Consumed |
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 x2
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| Items Consumed |
- | 
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| Resources |  200  80  120  390
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| Ship Helper | Conversion | |||||
|---|---|---|---|---|---|---|
 Hyuuga Kai Ni |
S-51J Kai | |||||
| Mon | Tue | Wed | Thu | Fri | Sat | Sun |
Improvement  effects
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1★ | 2★ | 3★ | 4★ | 5★ | 6★ | 7★ | 8★ | 9★ | Max★ |
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0.3 | 0.6 | 0.9 | 1.2 | 1.5 | 1.8 | 2.1 | 2.4 | 2.7 | 3.0 |
| Day?
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1.00 | 1.41 | 1.73 | 2.00 | 2.23 | 2.44 | 2.64 | 2.82 | 3.00 | 3.16 |
| Night?
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1.30 | 1.84 | 2.25 | 2.60 | 2.91 | 3.18 | 3.44 | 3.68 | 3.90 | 4.11 |