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Sikorsky H-5
No.326 S-51J
Heli.png Rotorcraft
Effects: Firepower+2 ASW+12 Accuracy+2 LoS+3
Combat Radius: 2 (Deployment Cost: Bauxite 5)
Scrap value: Fuel 2 Ammo 3 Bauxite 5 (Unbuildable)

Equipment Card S-51J.png

Equipment Character S-51J.png

Equipment Item S-51J.png

Equipment Full S-51J.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



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.


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.
  • CV(B/L) 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 and AR 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: O Type Observation Autogyro Kai NiO Type Observation Autogyro Kai Ni

From quest: B132 (choice)

Updates History

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

Fit Bonuses

Ship Extra Requirement Firepower Torpedo Attack Anti-Air Anti-Submarine Warfare Line of Sight Armor Evasion Note
Ise Kai NiIse Kai Ni +1 +3 +1 [1]
Hyuuga Kai NiHyuuga Kai Ni +3 +4 +2 [2]
Kaga Kai Ni GoKaga Kai Ni Go +3 +5 +3
Noshiro Kai NiNoshiro Kai Ni +4 +1 Non-stackable between any Rotorcraft
Yahagi Kai Ni (B)Yahagi Kai Ni
Yahagi Kai Ni B
+3 +1 Non-stackable between any Rotorcraft
  1. Firepower+0 Anti-Submarine Warfare+2 prior to 2020-08-27
  2. Firepower+1 Anti-Submarine Warfare+3 prior to 2020-08-27


Heli.png S-51J

Improvement Conversion
★ Improvement
0~5 6~9
Equipment Card S-51J Kai.png
S-51J Kai
Development material Consumed 8/9 9/10 50/80
Improvement material Consumed 7/7 7/9 10/20
Equipment Card Zuiun.png Equipment Card Saiun.png Equipment Card Type 95 Depth Charge.pngx2
- Item Icon New Model Aerial Armament Material.png
Resources Fuel200 Ammunition80 Steel120 Bauxite390
Ship Helper Conversion
Ship Banner Hyuuga Kai Ni.png
Hyuuga Kai Ni
Equipment Card S-51J Kai.png
S-51J Kai
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

Sikorsky H-5