 {| |} the nakajima j5n was an abandoned japanese prototype fighter aircraft of the world war ii era. ==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&nbsp;km/h (414&nbsp;mph) at 6,000&nbsp;m (19,690&nbsp;ft). nakajima submitted a proposal based on the earlier j1n1 gekko three-seat night fighter, although this new aircraft â designated j5n1 â 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&nbsp;kw (1,990&nbsp;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&nbsp;mm and two 20&nbsp;mm cannon, and provision was made for a centreline 250&nbsp;kg (550&nbsp;lb) bomb. the j5n was designed to combat the heavily armed u.s. fighters in the pacific theatre at that time, and this impressive armament would have done severe damage to these aircraft. to concentrate the firepower, the four cannons were mounted in the nose of the j5n. impressed with the design, the jnaf authorized the development of the j5n1, assigned the name tenrai (å¤©é·"heavenly thunder"), and six prototypes were requested to be built. the first prototype â lacking its armament â made its first flight july 13, 1944, and was something of a disappointment. the top speed attained was only 597&nbsp;km/h (371&nbsp;mph) â far below the specified 666&nbsp;km/h (414&nbsp;mph) of the requirement. despite the other five prototypes also having flown with numerous enhancements, the aircraft never achieved its d
Abandoned_military_aircraft_projects_of_Japan Japanese_fighter_aircraft_1940a1949 Nakajima_aircraft