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S-51J Kai

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Sikorsky H-5 Mk.1
No.327 S-51J改
Heli.png Rotorcraft
Effects: Firepower+2 ASW+13 Accuracy+3 LoS+4
Combat Radius: 2 (Deployment Cost: Bauxite 5)
Scrap value: Fuel 2 Ammo 3 Bauxite 6 (Unbuildable)

Equipment Card S-51J Kai.png

Equipment Character S-51J Kai.png

Equipment Item S-51J Kai.png

Equipment Full S-51J Kai.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
LBAS Plane



The autogyro has now evolved into the helicopter.
This 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, obtained by the Maritime Self-Defense Force after the war, and further enhanced.


Rotorcraft Rotorcraft are ASW Aircraft, being used to trigger some OASW and Land-based ASW attacks.

As they do not have any Dive Bombing Dive Bomber Attack 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 Dive Bomber or a Torpedo Bomber 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.


How To Obtain

Upgradeable from: S-51JS-51J

Updates History

  • 2019-03-27: Implemented
  • 2020-08-27: Visible bonuses increased

Fit Bonuses

S-51J Kai Equipment Bonuses
Ship Extra Requirement Firepower Torpedo Attack Anti-Air Anti-Submarine Warfare Line of Sight Armor Accuracy Evasion Note
Kaga Kai Ni GoKaga Kai Ni Go - +5 +6 +4
Hyuuga Kai NiHyuuga Kai Ni - +4 +5 +2
Ise Kai NiIse Kai Ni - +2 +4 +1

Additional synergy with: TBM-3W+3STBM-3W+3S

Rotorcraft Type Equipment Bonuses
Ship Extra Requirement Firepower Torpedo Attack Anti-Air Anti-Submarine Warfare Line of Sight Armor Accuracy Evasion Note
Noshiro Kai NiNoshiro Kai Ni (1st equipped) +4 +1 One-time[1]
Yahagi Kai Ni /BYahagi Kai Ni
Yahagi Kai Ni B
(1st equipped) +3 +1 One-time[1]
  1. 1.0 1.1 Shared with all RotorcraftRotorcraft


Heli.png S-51J Kai

Improvement Not
★ Improvement
0~5 6~9
Development material Consumed 9/10 12/20
Improvement material Consumed 8/8 8/10
Equipment Card Zuiun.pngx2 Equipment Card Type 3 Depth Charge Projector.pngx2
Resources Fuel240 Ammunition100 Steel120 Bauxite390
Ship Helper Conversion
Ship Banner Hyuuga Kai Ni.png
Hyuuga Kai Ni
Mon Tue Wed Thu Fri Sat Sun
Improvement Improved effects
Rotorcraft 1★ 2★ 3★ 4★ 5★ 6★ 7★ 8★ 9★ Max★
Anti-Submarine Warfare 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0
Accuracy Day? 1.00 1.41 1.73 2.00 2.23 2.44 2.64 2.82 3.00 3.16
Accuracy Night? 1.30 1.84 2.25 2.60 2.91 3.18 3.44 3.68 3.90 4.11

See Also