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The Nakajima J5N was an abandoned Japanese prototype fighter aircraft of the World War II era. J5N was developed as twin-engine interceptor for countering attacks by Boeing B-29 Superfortress.[1]

J5N
Nakajima J5N1 Tenrai
Role Interceptor
Manufacturer Nakajima Aircraft Company
Designer Katsuji Nakamura, Kazuo Ohno
First flight 13 July 1944
Primary user Imperial Japanese Navy Air Service
Number built 6

Design and development


During the spring of 1943, the JNAF issued an 18-Shi specification for a single-seat twin-engine interceptor capable of reaching a top speed of 666 km/h (414 mph) at 6,000 m (19,690 ft). Nakajima submitted a proposal based on the earlier J1N1 Gekko three-seat night fighter, although this new aircraft – designated J5N1 – was slightly smaller. The layout of the J5N was similar to the J1N: a low set wing on which were mounted the two powerplants, 1,484 kW (1,990 hp) Nakajima Homare 21 18-cylinder air-cooled radial engines, with a long fuselage ending in a conventional tail arrangement. For maximum utilization of the power from the twin engines, large four-blade propellers were fitted which also featured large spinners (as fitted to the J1N). The main wheels retracted rearwards into the engine nacelles, and the tailwheel was fixed. The cockpit was set above the wing, and featured a starboard-opening canopy. The nose was streamlined to offer the pilot an excellent forward view during landing, takeoff and taxiing.

Armament of the J5N consisted of two 30 mm and two 20 mm cannon, and provision was made for a centreline 250 kg (550 lb) bomb. The J5N was designed to combat the large, heavily armed and fast B-29 Superfortress, and so required such heavy armament in order to do severe damage in the brief windows of time allowed for firing passes. To concentrate the firepower, the four cannons were mounted in the nose of the J5N; if a single-engine fighter were unfortunate enough to find itself in front of a J5N, a single hit from a 30mm shell would have been more than adequate to destroy it.


Operational history


Impressed with the design, the JNAF authorized the development of the J5N1, assigned the name Tenrai (天雷, "Heavenly Thunder"), and six prototypes were requested to be built. Progress was impeded by the failure of the engines to produce their promised power, and by a steady increase in the weight of the airframe as the need to reverse the long-standing policy of giving low priority to armor protection led to a buildup of weight and a drop in performance.[2] The first prototype – lacking its armament – made its first flight July 13, 1944, and was something of a disappointment. The top speed attained was only 597 km/h (371 mph) – far below the specified 666 km/h (414 mph) of the requirement. Despite the other five prototypes also having flown with numerous enhancements, the aircraft never achieved its design speed, and the project was abandoned soon after in February 1945. Four of the six experimental aircraft were lost to accidents.[3]


Variants



Specifications (J5N1)


Data from [4]

General characteristics

Performance

(666.7 km/h (360 kn) at 6,000 m (19,685 ft) specification)

Armament

and/or

See also


Aircraft of comparable role, configuration, and era


References



Notes


  1. Shigeru 2000, p. 57.
  2. Berliner 2011, p. 149.
  3. Shigeru 2000, p. 56.
  4. Francillon 1970, p. 492.

Bibliography





На других языках


[de] Nakajima J5N

Die Nakajima J5N (Spitzname 天雷, Tenrai, deutsch „Himmlischer Donner“) war ein zweimotoriger Höhenabfangjäger der Kaiserlich Japanischen Marineluftstreitkräfte im Zweiten Weltkrieg.[1]
- [en] Nakajima J5N

[fr] Nakajima J5N Tenrai

Le Nakajima J5N Tenrai (天雷, "Tonerre Céleste") est un prototype de chasseur japonais abandonné de l'époque de la Seconde Guerre mondiale. Il fut développé comme étant un intercepteur bimoteur capable de contrer les attaques de Boeing B-29 Superfortress sur le territoire national du Japon, constamment bombardé durant la fin de la guerre.

[it] Nakajima J5N

Il Nakajima J5N Tenrai (天雷? tuono celeste) era un caccia intercettore bimotore ad ala bassa sviluppato dall'azienda giapponese Nakajima Hikōki KK negli anni quaranta e rimasto allo stadio di prototipo.

[ru] Nakajima J5N

Nakajima J5N «Tenrai» (яп. 天雷, «Тенрай» («Небесный гром»)) — проект истребителя Императорского флота Японии периода Второй мировой войны.



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