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Sikorsky H-5
No.326 S-51J
Heli.png Rotorcraft
Effects: Firepower+2 ASW+12 Accuracy+2 LoS+3
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 are ASW Aircraft, being used to trigger some OASW.

  • They will launch during aerial battle if other planes are launched, but cannot start an aerial battle on their own.
    • Are immune to shutdown.
  • 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 Akashi can equip them, but the former cannot attack SS, and the latter has a carrying capacity of 0 so it does not function.
  • AO can equip them, but their attack animation will still be a depth charge animation.

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


Type Name Resource Day 2nd Ship Note
Fuel Ammunition Steel Bauxite Item Icon Development Material.png Item Icon Improvement Material.png # of equipment needed for that upgrade. An asterisk following the number indicates a different equipment is required. Sun Mon Tue Wed Thu Fri Sat
Rotorcraft S-51J 0 200 80 120 390 8/9 7/7 1xSeaplane.png H X X X X X H Hyuuga Kai Ni Upgrades to S-51J Kai
6 9/10 7/9 1xYellowPlane.png
10 50/80 10/20 2xDepthCharge.png
1xNew Model Aerial Armament Material
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

See Also

Sikorsky H-5