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No.326 S-51J

Rotorcraft Autogyro

Effects: Firepower+2 Accuracy+2 Anti-Submarine+12 View Range+3

Scrap Value: Fuel2 Ammunition3 Bauxite5

Equipment Card S-51J.png

Equipment Character S-51J.png

Equipment Item S-51J.png

Equipment Full S-51J.png

Refittable Class
Coastal Defense ShipDestroyer
Light CruiserTorpedo Cruiser
Heavy CruiserAviation Cruiser
BattleshipAviation Battleship
Fast BattleshipLight Carrier
Standard CarrierArmored Carrier
Seaplane TenderSubmarine Tender
SubmarineSubmarine Carrier
Repair ShipTraining Cruiser
Fleet OilerAmphibious Assault Ship



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 that might have been introduced to the Maritime Self-Defense Force after the war.


As +7 ASW Anti-Submarine Warfare aircraft, they can be used to trigger special OASW.

  • Will launch during aerial battle if other planes are launched, but cannot start an aerial battle on its 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 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 quests: 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

Akashi's Improvement Arsenal

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

See Also

Sikorsky H-5