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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 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 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

S-51J 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 - +3 +5 +3
Hyuuga Kai NiHyuuga Kai Ni - +3 +4 +2
Ise Kai NiIse Kai Ni - +1 +3 +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

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