Ki-27 otsu

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VTOL | Rank 6 USA
AV-8A Harrier Pack
This page is about the Japanese fighter Ki-27 otsu. For other variants, see Ki-27 (Family).
Ki-27 otsu
GarageImage Ki-27 otsu.jpg
ArtImage Ki-27 otsu.jpg
Ki-27 otsu
1.3 2.0 1.3
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The Ki-27 otsu is a rank I Japanese fighter with a battle rating of 1.3 (AB/SB) and 2.0 (RB). It was introduced in Update 1.43.

The Allied reporting name for this plane was "Nate"; however, it was also called "Abdul" in the "China Burma India" theater by many post-war sources.

The Ki-27 is a frontline fighter for interwar/pre-WW2 historical engagements such as the Battles of Khalkin Gol. In most maps, the Ki-27 will distinguish itself as a low-level dogfighter: its performance below 1,000 m is superb and it can manoeuvre away from nearly any other comparable fighter. Like the Ki-10 series before it, the Ki-27 otsu suffers from its poor armament (twin 7.7 mm Type 89s) and weak armour, which means it makes for a poor interceptor despite its high speed, but the Ki-27 makes an excellent escort for bombers and flying boats to provide cover for their allied bombers.

General info

Flight performance

Max speed
at 3 500 m495 km/h
Turn time10 s
Max altitude8 500 m
EngineNakajima Kotobuki 41
Cooling systemAir
Take-off weight2 t

Like its Ki-10 predecessor, the Ki-27 relies on its manoeuvrability for its survival. Therefore, turnfighting is vital for a Ki-27 pilot. Avoid diving on opponents, due to the Ki-27's fuel feed issues, and focus on scaring enemy pursuers away from bombers rather than chasing a kill. A lone Ki-27 is easy prey for allied energy fighters. Like most Japanese fighters, engaging an enemy head-on is not recommended. If fighting an enemy energy fighter head-on, a good strategy is to turn away (usually a slight turn as you'll want him to miss you, but also pass you), and hope that he turns to follow.

Like the comparable A5M4, the Ki-27's carburettor engine suffers from fuel feed issues in negative G manoeuvres, like diving. Nosing down will cause the engine to choke out. Positive G manoeuvres like the Split-S are preferred. This issue will allow enemies to out dive the Ki-27, so engaging at low altitudes is preferred.

Additionally, the Ki-27 runs hot and will overheat at 100% throttle on all but the coldest maps. To cool off, ease the throttle back to 40% or 50% and, if possible, try to gain altitude. If the engine overheats during a dogfight, try to break off if the opportunity presents itself. No pilot can outmanoeuvre on an overheated engine.

Compared to the Ki-43-I, it has marginally better manoeuvrability with a very low stall speed around 91 km/h (49 knots) with landing flaps deployed. However, the Ki-27 retains the power-to-weight ratio of the Ki-10 biplane, allowing it to climb very steeply at a 45° climb angle.

Characteristics Max Speed
(km/h at 3,500 m)
Max altitude
Turn time
Rate of climb
Take-off run
Stock 476 465 8500 10.2 10.6 8.5 8.5 180
Upgraded 517 495 9.8 10.0 18.6 12.8


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 + -
554 550 N/A N/A 220 ~10 ~7
Optimal velocities (km/h)
Ailerons Rudder Elevators Radiator
< 350 < 350 < 350 > 296
Compressor (RB/SB)
Setting 1
Optimal altitude 100% Engine power WEP Engine power
3,300 m 705 hp 846 hp

Survivability and armour

Crew1 person
Speed of destruction
Structural554 km/h
Gear550 km/h

The Ki-27 does not have any armour, so your great turn rate is the only real defence. The fuel tanks aren't self-sealing either, which only strengthens the need to use your great turn rate. There is one fuel tank above and behind the oil cooling system; the rest are in the wings, with 2 in each wing.

Modifications and economy

Repair costBasic → Reference
AB103 → 128 Sl icon.png
RB184 → 230 Sl icon.png
SB113 → 141 Sl icon.png
Total cost of modifications2 970 Rp icon.png
895 Sl icon.png
Talisman cost190 Ge icon.png
Crew training200 Sl icon.png
Experts1 000 Sl icon.png
Aces20 Ge icon.png
Research Aces96 000 Rp icon.png
Reward for battleAB / RB / SB
10 / 20 / 60 % Sl icon.png
100 / 100 / 100 % Rp icon.png
Flight performance Survivability Weaponry
Mods aerodinamic fuse.png
Fuselage repair
200 Rp icon.png
60 Sl icon.png
40 Ge icon.png
Mods radiator.png
200 Rp icon.png
60 Sl icon.png
40 Ge icon.png
Mods compressor.png
330 Rp icon.png
100 Sl icon.png
65 Ge icon.png
Mods aerodinamic wing.png
Wings repair
250 Rp icon.png
75 Sl icon.png
50 Ge icon.png
Mods new engine.png
250 Rp icon.png
75 Sl icon.png
50 Ge icon.png
Mods metanol.png
Engine injection
480 Rp icon.png
145 Sl icon.png
95 Ge icon.png
Mods armor frame.png
330 Rp icon.png
100 Sl icon.png
65 Ge icon.png
Mods armor cover.png
480 Rp icon.png
145 Sl icon.png
95 Ge icon.png
Mods ammo.png
200 Rp icon.png
60 Sl icon.png
40 Ge icon.png
Mod arrow 1.png
Mods weapon.png
250 Rp icon.png
75 Sl icon.png
50 Ge icon.png

At this rank, the order of research is mainly personal preference, though the Ki-27 Otsu will benefit significantly from defensive and performance enhancing modifications.


Offensive armament

Ammunition1 000 rounds
Fire rate900 shots/min
Main article: Type 89 (7.7 mm)

The Ki-27 otsu is armed with:

  • 2 x 7.7 mm Type 89 machine guns, nose-mounted (500 rpg = 1,000 total)

Usage in battles

A superior dogfighter for turnfighting, the Ki-27 is the first plane to begin showing the features typical of the Japanese "Zero" but with none of the bite. Its speed and manoeuvrability are plagued by engine problems, with no armour and a standard armament.

In battle, no Allied fighter can outturn you, except for biplanes, but most will outgun you (and even most biplanes match the Ki-27 in armament).

Biplanes make easy prey for the Ki-27, and it can easily outmanoeuvre the P-36C, the F2A-1 and the I-16 type 24, but their stronger armaments will knock out a Ki-27 in a single good burst. Simply outrunning any of them is an excellent evasive manoeuvre. Hurricane Mk I/Ls can strictly compete with the Ki-27 Otsu in manoeuvrability, but the Hurricane's heavier armament (four times that of the Ki-27) can also quickly shred a Ki-27. Additionally, outrunning a Hurricane in a Ki-27 is not possible. The I-15bis will be the bane of a Ki-27s existence, as their excellent turning ability will force it into energy bleeding manoeuvres or Boom & Zoom style combat.

Enemies worth noting

Despite its low battle rating, you can face some challenging foes when flying the Ki-27. Biplanes will give you a run for your money in terms of manoeuvrability, while some early monoplanes will be faster and more heavily armed than you. Therefore, it is important to judge your foes accordingly.

From America, you will face the P-26. They are quite good divers and have a decent roll rate, but will not be able to outmanoeuvre you in a turn fight. The P-36 is more challenging. Faster and well-armed, you will have to rely on your turn rate to try and outmanoeuvre them.

Then from Germany you also have the He 100 D-1, which is fast. Its energy energy retention is good as which means that it will bleed speed far slower than you. The best way to fight it is to lure it into a dogfight to bleed its energy. If the He 100 D-1 breaks off the engagement, runs away and is out of your shooting distance, you should just break off too but be prepared for it to come back.

One of the most challenging opponents is the I-153 M-62 Chaika. It is not a mere upgraded I-15bis, but in all performance aspects equal to the Nakajima Ki-27 fighter. Also on the Soviet side, the MiG-3 is a significant threat. It is one of the fastest aircraft in its battle rating and has powerful armament. In skilled hands, it can be an almost impossible opponent to combat, especially when using Boom & Zoom tactics against you. Your only defence will be to try and outmanoeuvre it or to lure it into a turnfight.

Manual Engine Control

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

Pros and cons


  • Great manoeuvrability, on par with biplanes
  • Good stability in turns
  • Good speed, for its tier
  • Excellent climb rate


  • Limited firepower
  • Engine overheats rapidly on hot maps
  • Engine chokes in negative G dives
  • No armour



The Nakajima Ki-27 otsu began as the Ki-11, a competitor for the Kawasaki Ki-10 biplane. While faster and more modern than the Ki-10 biplane, the Ki-11 wasn't adopted because the Imperial Japanese Army valued manoeuvrability over speed. Nakajima continued development of the design before finalising the Ki-12, a modern monoplane with a liquid-cooled engine and retractable landing gear, but the Army denied it outright as too maintenance heavy for forward airbases in Manchuria and China. The redesigned plane instead featured a radial air-cooled engine, fixed landing gear and fully enclosed cockpit and received the designation Ki-27.

In 1936, the Ki-27 competed against the Kawasaki Ki-28 (a prototype design fated to never enter production) and the Mitsubishi Ki-33 (a de-navalised A5M). While the Ki-33 outperformed the Ki-27 in most regards, the Imperial Japanese Army was loath to adopt a "navy fighter", and approved the Ki-27 with minor modifications. The Ki-27 entered service as the Army Type 97 Fighter.

Service History

While the Ki-10 would not be finally phased out from front line service until 1942, by 1940, the Ki-27 was the primary army fighter on the front lines. It was unmatched by any plane in the Chinese air force inventory, and outperformed the Soviet I-15 and I-16 fighters in the Battles of Khalkhin Gol, with some pilots scoring 11 kills against Soviet planes in a single day. Against Chinese Curtiss P-36 Hawks, veteran Ki-27 pilots achieved similar, but not as impressive kill rates.

Over China, the Ki-27 was unmatched until the deployment of the P-40 Warhawks with the American Volunteer Group. After America's entry into the war, the Ki-27 also fared poorly against the US Navy's F2A Brewster Buffalo and F4F Wildcat and was removed from most front line service within the first months of the war, replaced by the much-improved Ki-43. However, it remained a front line fighter in Thai service, where the Ki-27 scored recorded kills against P-51s and at least one P-38.

Because of their high production numbers and relatively few losses, Ki-27 would see a renewed role late in the war as Kamikaze planes.



See also

Links to the articles on the War Thunder Wiki that you think will be useful for the reader, for example:

  • reference to the series of the aircraft;
  • links to approximate analogues of other nations and research trees.

External links

Nakajima Aircraft Company (中島飛行機株式会社 )
Fighters  Ki-27 otsu · Ki-27 otsu Tachiarai
  Ki-43-I · Ki-43-II · Ki-43-III otsu
  Ki-44-I · Ki-44-I 34 · Ki-44-II otsu · Ki-44-II hei
  Ki-84 ko · Ki-84 otsu · Ki-84 hei
Hydroplanes  A6M2-N*
Interceptors  J1N1 · J5N1
Bombers  B5N2
  B6N1 Model 11 · B6N2 Model 12 · B6N2a Model 12Ko
  G5N1 · G8N1
  Ki-49-I · Ki-49-IIa · Ki-49-IIb · Ki-49-IIb/L
Recon  E8N2
Jet Fighters  Kikka
Captured  ␗Ki-27 otsu · ▃Ki-43-II · ␗Ki-43-III ko · ␗Ki-44-II hei · ␗Ki-84 ko
  *Refit of the Mitsubishi A6M2 mod. 11
See also  Fuji Heavy Industries (1957-2017)

Japan fighters
Carrier-based fighter 
A5M  A5M4 · Hagiri's A5M4
A6M  A6M2 mod. 11 · A6M2 · A6M3 · A6M3 mod. 22 · A6M3 mod. 22Ko · A6M5 · A6M5 Ko · A6M5 otsu · A6M5 Hei · A6M6c
A7He  A7He1*
A7M  A7M1 (NK9H) · A7M2
Land-based Fighter 
J2M  J2M2 · J2M3 · J2M4 Kai · J2M5 · J2M5 (30 mm)
J6K  J6K1
J7W  J7W1
N1K-J  N1K1-Ja · N1K2-J · N1K2-Ja
Fighter seaplane 
N1K  N1K1
A6M-N  A6M2-N
Ki-10  Ki-10-I · Ki-10-I C · Ki-10-II · Ki-10-II C
Ki-27  Ki-27 otsu · Ki-27 otsu Tachiarai
Ki-43  Ki-43-I · Ki-43-II · Ki-43-III otsu
Ki-44  Ki-44-I · Ki-44-I 34 · Ki-44-II otsu · Ki-44-II hei
Ki-61  Ki-61-I ko · Ki-61-I otsu · Ki-61-I hei · Tada's Ki-61-I hei · Ki-61-I tei · Ki-61-II Otsu Kai
Ki-84  Ki-84 ko · Ki-84 otsu · Ki-84 hei
Ki-87  Ki-87
Ki-94  Ki-94-II
Ki-100  Ki-100 · Ki-100-II
Other countries  ▅F4U-1A · ▅P-51C-11-NT · ▅Bf 109 E-7 · ▅Fw 190 A-5
  *Imported designation of the He 112 (A6M was in development - A7M would take A7 designation after the cancelation of the A7He)