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NAKAJIMA Ki.27 "NATE" PERFORMANCE / TIMELINE


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#1 CORSNING

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Posted 16 July 2017 - 11:57 AM

Nakajima Ki.27 "Nate

The follow speeds are for the Ki.27 tested by the Russians and are on Graph 002.

This graph can be seen here: http://www.rkka.es/a..._002/01_002.htm

Altitude / Speed

Meters / km/h / mph.

S.L.      393 / 244

1,000   409 / 254

2,000   424 / 263

3,000   441 / 274

4,000   440 / 273

5,000   434 / 270

6,000   426 / 265

7,000   415 / 258

8,000   403 / 250

Maximum: 442 km./h./3,080 m. / 275 mph./10,100 ft.

 

The following information is from Japanese aircraft of the Pacific War and applies to the Ki.27a & Ki.27b

 

Engine: Nakajima Ha-1b: 710 hp./T.O.,   780 hp./2,900 m.

Armament: 2 x 7.7 mm. type 89 machine guns.

 

Maximum Speed: 470 km/h / 3,500 m.,   292 mph./11,400 ft.

 

Wing Area: 199.777 sq. ft.

 

Range: 627 km. / 350 km./h. / 3,500 m.,   390 ml. / 217 mph. / 11,480 ft.

 

Climb: 5,000 m./5' 22"   (3,055 fpm average)

 

Normal Loaded Weight: 1,790 kg. / 3,946 lb.

 

Wing Loading: 19.75 lb./sq. ft.

 

Power Loading: 5.059 lb./hp.


Edited by CORSNING, 01 August 2017 - 07:24 PM.


#2 CORSNING

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Posted 16 July 2017 - 12:36 PM

Nakajima Ki.27 "Nate" Timeline

 

July 1936: Nakajima rolled out a prototype designated P E (Pursuit Experimental)

     with an air cooled radial engine and fixed spatted undercarriage.

 

15 October 1936: 1st flight of the prototype Ki.27  (P E) at Ojima Airfield.

     Wing Area: 16.4 sq. m. (176.527 sq. ft.),   Wing Span: 10.4 m. (34' 1 7/16")

 

December 1936: 1st flight of the second prototype with a new wing.

     Wing Area: 17.6 sq. m. (189.44 sq. ft.)

     Speed: 291 mph./9,000 m.

     Climb: 5,000 m./5' 10"

     Engine: Nakajima Ha-1a: 710 hp./T.O.,   650 hp./2,000 m.

 

Early 1937: The design was designated Ki.27 and began tests at the JAAF

     Technical Air Research Institute at Tachikawa. It was pitted against:

     Mitsubishi Ki.33: 301 mph./4,000 m.,   5,000 m./5' 56"

     Kawasaki Ki.28: 295 mph./3,000 m.,   5,000 m./5' 35"

     The Ki.27 was the slowest of the three but had superlative maneuverability.

 

Spring 1937: The Koku Hombu ordered ten pre-production Ki.27. At this time

     it was decided to increase the wing span to 11.31 m. (37' 1 1/4"). Wing area

     was increased to 18.56 sq. m. (199.777 sq. ft.).

    

Note: The Ki.27 was a balance between performance, potential reliability, simplicity,

     ease of operation and maintenance.

Note: Armament of all Ki.27s was the license-built Vickers Class E machine gun

     produced by Tokyo, Kokura & Nagoya Army Arsenals. 2 x Type 89  7.7 mm./

     500 rpg./900 rpm./ 2,690 fps. velocity.

 

June-December 1937: Ten Pre-production Ki.27s were constructed and Nakajima

     tooled up for series production at its Factory No.1 in Ota.

 

December 1937: The Koku Humbu approved the series production of the Ki.27  

     and production began as the Army Type 97 Fighter Model A (Ki.27).

     Engine: Nakajima Ha-1b: 710 hp./T.O.,   780 hp./2,900 m.

 

March 1938: The first Ki.27s were sent to Northern China.

 

3 April 1938: The first Ki.27kos to become operational were with the 1st Chutai of

     the 2nd Hiko Daitai. The Ki.27 supplemented their Ki.10s

 

1 July 1938: The 59th Fighter Sentai becomes the first unit to be exclusively equipped

     with the Ki.27 at Kagamigahara, Gifu Profecture.

 

July-August 1940: Progress of the Ki.43 was slow so Nakajima designed a lightweight

     version designated Ki.27Kai. Two were constructed. Maximum speed reached 295

     mph. Wing Loading had dropped to 80 kg./sq. m. (16.4 lb./sq. ft.).

     Loaded Weight was 3.276 lb.


Edited by CORSNING, 17 July 2017 - 02:17 PM.


#3 CORSNING

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Posted 17 July 2017 - 02:22 PM

Pilot Notes:

 

In 1939 the Chinese captured an intact Ki.27 and transported it to Cheng Tu where

Clair Chennault was able to test it against the Hawk 75M, Gloster Gladiator and

the Polikarpov I-16. Chenault noted, "climbs like a skyrocket and maneuvers like

a squirl." "...more troublesome than the Zero (actually Ki.43) because of its

outstanding rate-of-climb and incredibly short turning radius."

 

The sliding canopy was often removed in China to improve visibility.


Edited by CORSNING, 24 July 2017 - 08:30 PM.


#4 CORSNING

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Posted 21 July 2017 - 07:17 PM

Notes from Ki-27 'Nate' Aces, Osprey Aircraft of the Aces No.103

by Nicholas Millman

 

Page 23:

    ' A series of low-level running fights followed in which the Ki-27's attempted

to evade and outfly their faster pursuers. A JAAF fighter pilot recalled that this

was no easy feat when pursued by an I-16:

     " The 97-Sen was easy to fly and very agile. If a pursuer was seen it was

easy to climb quickly and turn to follow him, but it could not be dived too steeply

or too fast without excessive vibration and it became difficult to take aim properly.

Diving away from a fight was always dangerous because the "gadfly" (I-16) could

dive more strongly, and vigilance was necessary." '

     ' Captain A S Nikolayev, who flew an I-153 during the latter stages of the conflict,

gained a similar impression of the Ki-27 in combat;

     " The I-97 (Ki.27) dived steeply for less than 700-1,000 m., then the enemy

pilot would stop the pursuit. During interrogation captured Japanese airmen were

asked why they were diving steeply, but not for very long. They said that there was

considerable vibration, especially from their wings, and the engine rapidly cooled

off and could even stop."



#5 CORSNING

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Posted 31 August 2017 - 06:52 PM

Aircraft of the Aces 103

 

Page 69:

     " Future ace Bob Neale, who was flying one of the Hawk 81A-2s on this date,

recalled that the Ki.27s were 'much slower than us, and it was easy to get away

from them, but you couldn't turn with them. You could make a pass at them and

try to get them in your sights long enough to really hit them'."



#6 CORSNING

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Posted 18 September 2017 - 07:53 PM

Aircraft of the Aces No.103

 

Page 79

     A JAAF staff officer noted at the time (4 July 1942) that conduction surprise attacks

was proving to be very difficult because of the enemy's precise aircraft observation and 

reporting network. The Ki-27 was also too slow to effectively confront the improved P-40E,

its agility being effectively countered by the American hit and run tactics. 'The speed and

firepower of the American fighters is formidable, and each time after striking and returning,

they cannot be caught by the 97-Sen. Our pilots have to fire at fleeting targets'.






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