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NAKAJIMA J1N1 PERFORMANCE / TIMELINE


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#1 CORSNING

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Posted 20 August 2016 - 07:14 PM

j1nlat1.gifNakajima J1N1-C-KAI Gekko (Moonlight) Code Name: Irving

Information comes from T.A.I.C. 104A.

 

The following information applies to the night fighter with full radar equipment.

 

Altitude / Speed / Climb

Meters / mph    / fpm / time to altitude

S.L         274      1780     

1,000     285      1815      1.4

2,000     297      1851      3.4

3,000     305      1830      5.25

4,000     303      1570      7.25

5,000     312      1439      9.45

6,000     325      1460    11.95

7,000     321      1119    14.7

8,000     304        777   

9.000     285        435

 

Speed:

Full throttle height in low supercharger: 306 mph./2,804 m.

Switch low/high supercharger: 302 mph./4,175 m.

Full throttle height in high s/c: 325 mph./6,005 m.

 

Climb:

Critical altitude low supercharger: 1,880 fpm./2,804 m.

Switch low/high s/c: 1,430 fpm./4,542 m.

Critical altitude high s/c: 1,460 fpm./6,005 m.

 

Ceiling:

Combat: 23,150 ft. (7,056 m.)

Operational: 27,950 ft. (8,519 m.)

Service: 32,740 ft. (9,979 m.)

 

Armament (All 20 mm. Type 99 Model 2 / 100 rpg,):

1 fixed firing forward in the nose + 2 mid upper fuselage firing 30 degrees forward + 2  mid lower

fuselage firing 30 degrees forward. 

 

Engines: 2 x Nakajima Sakae 21:

     1,115 hp. / T.O. / S.L.

     1,180 hp. / 7,500 ft. (War Emergency)

     1,085 hp. / 9,350 ft. (Military)

        965 hp./ 19,700 ft.

 

Wing Area 430.556 sq. ft.

 

Combat Weight: 16,600 lbs.

 

Wing Loading (at take-off): 38.55+ lbs./sq. ft.

 

Power Loading (at WEP 7,500 ft. @ take off weight): 7.034-lbs./hp.         

 

18ae87d1c7e717699bba1400bb2e5483.jpg


Edited by CORSNING, 05 April 2017 - 05:38 PM.


#2 CORSNING

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Posted 20 August 2016 - 08:08 PM

Nakajima J1N1-C-KAI

Information comes from T.A.I.C. 104A

 

The information applies to a very early night fighter without all the radar equipment:

 

Altitude / Speed / Climb

Meters / mph.    / fpm. / time to altitude.

S.L.       281      1810     1.3

1,000    293      1856     3.3

2,000    305      1903     5.1

3,000    313      1890     7.05

4,000    308      1630     9.1

5,000    320      1498    11.5

6,000    333      1515    13.9

7,000    323      1207

8,000    311        862

9,000    294        517

 

Speed:

Full throttle height low s/c: 314 mph./2,804 m. (9,200 ft.)

Switch low/high s/c: 309 mph./4,175 m. (13,700 ft.)

Full throttle height high s/c: 333 mph./6,005 m. (19,700 ft.)

 

Climb:

Critical altitude low s/c: 1,940 fpm./2,804 m. (9,200 ft.)

Switch low/high s/c: 1,490 fpm./4,542 m. (14,900 ft.)

Full throttle height high s/c 1,515 fpm./6,005 m. (19,700 ft.)

 

Ceiling:

Combat: 23,700 ft.

Operational: 28,620 ft.

Service: 33,500 ft.

 

Armament: Same as above.

 

Engines: Same as above.

 

Wing Area: Standard

 

Combat Weight: 16,400 lbs.

 

Wing Loading: 38.09 lbs./sq. ft.

 

Power Loading: 6.95 lbs./hp.

 

irvingj1n2largebyfujimi.jpg

j1n-c1.jpg


Edited by CORSNING, 24 August 2016 - 05:50 PM.


#3 CORSNING

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Posted 08 April 2017 - 12:50 PM

Nakajima J1N Timeline

 

Spring 1938: The Japanese Naval Bureau of Aeronautics staff began to draft a 13-Shi specifications

     inspired by the Potez 63 in order to develop a long-range fighter capable of escorting bombers

     deep into China.

 

June 1938: The Japanese Naval Bureau of Aeronautics approached Mitsubishi and Nakajima with

     the 13-Shi specification. The aircraft was intended to fulfill requirements for a long-range multi-

     seat escort fighter. It was also to fill the position of high-speed reconnaissance and night intruder.

     13-Shi Specification:

     Three-seat twin-engine long-range fighter.

     Emphasis was placed on good combat maneuverability so that it could cope with single-engine

     enemy fighters. Maximum speed to be 280 kt. (322 mph.) Internal fuel range of 1,300 nautical

     miles (1,496 mls.) and a maximum of 2,000 naut. mls. (2,303 mls.). Armament to be one 20 mm.

     cannon plus one 7.7 mm. machine gun forward firing and one 7.7 mm. firing to the rear.

    

Note: Both Mitsubishi and Nakajima were involved with other aircraft designs and the 13-Shi was

     delayed.

 

May 1941: First flight of the Nakajima J1N1 prototype with two twin 7.7 mm. remote-controlled

     barbettes behind the cockpit and one 20 mm. + 2 x 7.7 mm. firing forward. The engines were

     Nakajima Sakae 21 / 22 (1,130 hp./each) with contra-rotating propellers.The aircraft was

     very overweight with sluggish handling and maneuverability.

 

August 1941: The J1n1 2nd prototype with trailing-edge flaps and leading-edge slots to improve

     maneuverability and the 1st prototype were delivered to the IJN for service trials where they

     competed with and A6M2.

 

October 1941: Both aircraft were found to be considerably over weight. There were problems with

     the contra-rotation propellers and complex hydraulic system. The 7.7 mm. barbette were too

     heavy and difficult to aim. Severe aileron vibration during rolls was encountered. Maneuverability

    was quite remarkable (2nd prototype) for a twin-engine aircraft but still inadequate. Inferior in all

     accounts to the A6M2 except range. The Navy decided to reject the J1N1 as a long-range escort

     fighter. However, its speed was very close to the A6M2's. Nakajima was authorized to modify the

     the existing frames being worked on as fast land-based long-range reconnaissance aircraft.

 

July 1942: The J1N1-C type 2 model 11 Reconnaissance aircraft successfully passed its flight trials 

     and was put into production. Reliability and ease of maintenance were improved. The was a

     crew of three; pilot, radio operator/rear gunner and navigator/observer.

     Engine: 2 x Nakajima Sakae 21 (non-contra-rotating)

     Fuel was reduced from 2,270 liters to 1,700 liters with provisions for 2 x 330 liter drop tanks.

     Armament: 1 x 13 mm. Type 2 machine gun rear firing.

 

Autumn 1942: Deliveries of J1N1-C began to the IJAAF.

 

Spring 1943: The J1N1-C began operational missions over the Solomon Islands. The Allies identified

     it a fighter and gave it the code name Irving.

Note: Some were designated J1N1-R and armed with a 20 mm. Type 99 Model 1 cannon mounted in

     in a spherical turret behind the pilot's seat.

 

Spring 1943: Commander Yasuna Kozono, commanding officer of the 251st Kokutai (Air Corps) then

    based at Vunakanau Airfield at Rabaul had devised a system for obliquely-mounted cannon in the

     observer's cockpit and used the J1N1-C as a night-fighter.

Note: The maintenance crews at Rabaul removed all the equipment out of the observer's cockpit and

     installed 2 x 20 mm. cannon firing forward and upward at a 30 degree angle. The aircraft was

     designated J1N1-C Kai and soon after intercepted and destroyed 2 B-17s of the 43rd Bomb Group.

     This interception got the IJNAF's attention. They had been recognizing the need for a night fighter

     and instructed Nakajima to begin manufacturing a completely new version ot the J1N1 night fighter.

 

August 1943: Production of the J1N1-S Gekko (Moonlight) Model 11 began at Koizumi. Two dorsal and

     two ventral 20 mm. Type 99 obliquely firing cannon were installed. The individual exhaust stubs were

     replaced with a collector ring. It had primitive AI Radar.

Note: Combat experience found that the downward-firing cannon were not as effective as the upward-

     firing cannon and were not installed in late model aircraft. These were designated J1N1-Sa Gekko

     Model 11A. Some J1N1-Sas had 3 upward firing cannon.

 

Note: Before the end of the war most Gekko fighters and reconnaissance aircraft were modified for

     Kamikaze use (Devine Wind).

 

Production: Nine prototypes and 470 production aircraft were built.



#4 CORSNING

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Posted 08 April 2017 - 12:54 PM

NOTES:

 

     The JN1-S / Sa was successful against B-17s and B-24s but the speed of the B-29 allowed only

one pass before it was out of range. One pass was rarely enough to take down the well protected

B-29.






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