Ki-108 Kai

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Rooikat 105 PACK
Ki-108 Kai
GarageImage Ki-108 Kai.jpg
ArtImage Ki-108 Kai.png
Ki-108 Kai
3.7 3.7 3.3
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The Ki-108 Kai was a Japanese twin-engine heavy fighter/interceptor prototype developed from the Ki-96 and Ki-102 models. It was designed to counter the high-altitude American bombers such as the B-29 Superfortress. It had a pressurized cockpit, a 37 mm nose cannon and two 20 mm chin cannons. It was powered by two Mitsubishi Ha-112-II Ru turbosupercharged radial engines. Only four Ki-108s were built and none saw combat before the end of the war.

It was introduced in Update 1.77 "Advancing Storm". The Ki-108 is a formidable heavy fighter that boasts strong armament, respectable climb performance, and reasonable manoeuvrability. Its main drawback is its vulnerable engines that can be crippled by enemy fire. The optimal strategy for this plane is to intercept bombers from the front or side and evade their rear gunners. The plane can also handle fighters that are lower than it, but it should not challenge them on equal footing, as it lacks dogfighting and escape capabilities. The plane should climb to the side of the map and have friendly cover above it. If the plane faces enemy fighters at high altitude without allies, it should be cautious and strike when they are unsuspecting.

General info

Flight performance

Max speed
at 8 000 m622 km/h
Turn time21 s
Max altitude13 000 m
Engine2 х Nakajima Ha-112-II Ru
Cooling systemAir
Take-off weight8 t
Characteristics Max Speed
(km/h at 8,000 m)
Max altitude
Turn time
Rate of climb
Take-off run
Stock 597 580 13000 22.1 22.9 8.4 8.4 600
Upgraded 649 622 20.4 21.0 16.9 12.1


Combat flaps Take-off flaps Landing flaps Air brakes Arrestor gear
Wings (km/h) Gear (km/h) Flaps (km/h) Max Static G
Combat Take-off Landing + -
762 310 437 408 260 ~10 ~7
Optimal velocities (km/h)
Ailerons Rudder Elevators Radiator
< 360 < 400 < 400 > 312

Survivability and armour

Crew1 person
Speed of destruction
Structural0 km/h
Gear310 km/h
  • 12 mm Steel - Pilot's headrest
  • 12 mm Steel - Pilot's backrest

Modifications and economy

Repair costBasic → Reference
AB851 → 1 098 Sl icon.png
RB1 864 → 2 406 Sl icon.png
SB2 639 → 3 406 Sl icon.png
Total cost of modifications19 900 Rp icon.png
32 800 Sl icon.png
Talisman cost980 Ge icon.png
Crew training13 000 Sl icon.png
Experts47 000 Sl icon.png
Aces400 Ge icon.png
Research Aces280 000 Rp icon.png
Reward for battleAB / RB / SB
50 / 130 / 270 % Sl icon.png
136 / 136 / 136 % Rp icon.png
Flight performance Survivability Weaponry
Mods aerodinamic fuse.png
Fuselage repair
1 300 Rp icon.png
2 100 Sl icon.png
110 Ge icon.png
Mods radiator.png
1 300 Rp icon.png
2 100 Sl icon.png
110 Ge icon.png
Mods compressor.png
1 500 Rp icon.png
2 500 Sl icon.png
125 Ge icon.png
Mods aerodinamic wing.png
Wings repair
1 700 Rp icon.png
2 800 Sl icon.png
145 Ge icon.png
Mods new engine.png
1 700 Rp icon.png
2 800 Sl icon.png
145 Ge icon.png
Mods metanol.png
Engine injection
3 200 Rp icon.png
5 300 Sl icon.png
270 Ge icon.png
Mods armor frame.png
1 500 Rp icon.png
2 500 Sl icon.png
125 Ge icon.png
Mods armor cover.png
3 200 Rp icon.png
5 300 Sl icon.png
270 Ge icon.png
Mods ammo.png
1 300 Rp icon.png
2 100 Sl icon.png
110 Ge icon.png
Mod arrow 0.png
Mods weapon.png
1 500 Rp icon.png
2 500 Sl icon.png
125 Ge icon.png
Mods weapon.png
1 700 Rp icon.png
2 800 Sl icon.png
145 Ge icon.png


Offensive armament

Weapon 137 mm Ho-204 cannon
Ammunition35 rounds
Fire rate360 shots/min
Weapon 22 x 20 mm Ho-5 cannon
Ammunition400 rounds
Fire rate948 shots/min

The Ki-108 Kai is armed with:

  • 1 x 37 mm Ho-204 cannon, nose-mounted (35 rpg)
  • 2 x 20 mm Ho-5 cannons, chin-mounted (200 rpg = 400 total)

Usage in battles

The Ki-108's assets are its excellent guns (especially the 37 mm Ho-204 with its quick rate of fire; the 20 mm are unimpressive but will give you a chance to finish a wounded enemy), its climbing speed, and its fairly good manoeuvrability for a plane with so much firepower. Its main weakness is its engine vulnerability. Use the climb rate and speed to engage bombers from the front or front-side, down or cripple, disengage to reload, climb back and repeat. Do not engage bombers from behind as even a B-18A or B-34 has a good chance of crippling you with its tail gunners. Fighters climbing towards you are reasonably easy prey, but try to avoid confrontations where you do not have an altitude advantage, as your dogfighting ability is low and your escape speed is unimpressive if you don't start with a strong advantage.

In Air AB, it's best to side climb, as even when fully upgraded, the Ki-108 will not outclimb aircraft such as the Bf 109 F-4. The Ki-108 performs best when there are teammates above you to provide you with cover - if you find yourself alone at high altitude against single-engine enemy fighters, you'll have to be very wary of them and take them out when they least expect it - a Ki-108 probably won't beat something like a Bf 109 F-4 in a 1 v 1 engagement unless it comes in with an element of surprise or a significant altitude or speed advantage.

Overall, a fantastic interceptor at its battle rating, good enough to regularly score Survivor awards.

Manual Engine Control

MEC elements
Mixer Pitch Radiator Supercharger Turbocharger
Oil Water Type
Controllable Controllable
Auto control available
Not auto controlled
Not auto controlled
Separate Not controllable
1 gear
Not controllable

Pros and cons


  • Powerful armaments
  • Decent climb rate


  • Serious overheating issues even without WEP
  • The 37 mm are inaccurate even once upgraded
  • Low ammo counts; require trigger discipline
  • Poor roll rates at low and high speeds
  • Highly flammable
  • Absolutely awful cockpit visibility


Development of the Ki-108 began in April 1943 after Kawasaki wanted to fulfil a standing requirement with the Japanese Army for a heavy interceptor that initially began with the Ki-45 heavy fighter series. The Ki-108's design was derived mostly from the previous Ki-102 project and took some elements of the Ki-96 as well, effectively combining the two designs into one. After the first B-29 Superfortress bombers made their appearance over the Japanese home islands, the need for such a high-altitude interceptor became even more emphasized. Two Ki-102 otsu airframes were taken from the assembly line in 1944 to produce the initial Ki-108 prototypes. Compared to the Ki-102, which was intended as a low-altitude attack aircraft, the Ki-108 was an interceptor meant for high altitude operations. To allow for this, the Ki-108's cockpit had to be significantly reduced in size and was to be hermetically sealed. This effectively turned the Ki-108 into a single-seater, reduced weight and decreased the strain on the engines all at the same time, which allowed for better performance at higher altitudes.

The two initial prototypes were completed in July and August 1944, respectively. An improved version of the Ki-108 was designed based around the Ki-102 Hei, featuring a wider wingspan and a longer fuselage, in an effort to improve high-altitude handling. Two examples of the Ki-108 Kai variant were built and subsequently tested in 1945. However, the worsening war situation for Japan prematurely concluded testing of the type and both versions never left prototype stage, yet alone seeing combat. A total of four Ki-108s were manufactured between 1944 - 1945.

- From Devblog



See also

External links

Kawasaki Aircraft Industries (川崎航空機工業株式会社)
Biplane Fighters  Ki-10-I · Ki-10-I C · Ki-10-II · Ki-10-II C
Fighters  Ki-61-I ko · Ki-61-I otsu · Ki-61-I hei · Ki-61-I hei Tada's · Ki-61-I tei · Ki-61-II Otsu Kai
  Ki-100 · Ki-100-II
Interceptors  Ki-45 ko · Ki-45 otsu · Ki-45 hei · Ki-45 tei
  Ki-102 otsu
  Ki-108 Kai
Bombers  Ki-32
  Ki-48-II otsu
Captured  ␗Ki-45 hei/tei · ␗Ki-61-I otsu · ▃Ki-61-Ib
See also  Kawasaki Shipyard Co.

Japan twin-engine fighters and strike aircraft
Land-based Fighter 
J1N  J1N1
J5N  J5N1
Ki-45  Ki-45 ko · Ki-45 otsu · Ki-45 hei · Ki-45 tei
Ki-83  Ki-83
Ki-96  Ki-96
Ki-102  Ki-102 otsu
Ki-108  Ki-108 Kai
Ki-109  Ki-109