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Nakajima G5N1 "Shinzan" experimental four-engine, long-range, land-based bomber (Allied reporting name: Liz), Navy 13-Shi specification An all-metal, seven-seat cantilever monoplane with retractable nose landing gear. It was designed in 1939-41 in the design bureau of Nakajima Aircraft Company, following the Imperial Japanese Navy's 13-Shi specification. The specification called for a long-range bomber with a flight range of about 3,000-3,500 nautical miles. Since the Japanese aircraft designers at that point lacked experience creating a heavy four-engine aircraft, like the new bomber would be, it was decided to take a foreign design as the basis of the plane, to achieve the required characteristics. For this purpose, the Nippon Koku K.K. airline purchased the sole model of the American Douglas DC-4E airliner that was given in 1939 to the Nakajima Company after arriving in Japan, without making this knowledge public, to create the long-range bomber on its basis. A G5N1 prototype, which became the first four-engine aircraft in the Japanese Navy, got off the ground in April 1941. The plane created by the Japanese designers retained the wing, the powerplant, and the landing gear of its American prototype, but it had a new fuselage with a glazed nose and a bomb bay, as well as a new twin-fin tail. The G5N1 was the first aircraft created in Japan to have a nosewheel. The G5N1 bomber had four Mitsubishi MK4B Kasei-12 fourteen-cylinder air-cooled engines, with a maximum takeoff power of 1,530 hp and Sumitomo/Hamilton four-bladed, fixed-pitch metal propellers. The G5N1 bomber's defensive armament consisted of two 20 mm Type 99 Model 1 (Oerlikon FF) magazine-fed cannons: one in a rear turret, and one in an upper turret, capable of 360-degree fire and electrically driven. The cannon in the upper turret had 12 drum magazines with 45 rounds each for a total of 540 shots, and the rear one had 8 drum magazines with 45 rounds each for a total of 360 shots. Four 7.7 mm Type 97 (Lewis) magazine-fed machine guns were mounted in a nose, a ventral, and two side turrets. The machine guns in the nose and the ventral mounts had 7 pan magazines with 97 rounds each for a total of 679 shots, and those in the side mounts had 6 pan magazines with 97 rounds each for a total of 582 shots. The G5N1 bomber's combat load was only carried internally. Bombs ranging from 60 kg to 1,500 kg, in various combinations, could be suspended in the bomb bay positioned along the whole length of the centre wing section. The maximum bomb capacity was 4,000 kg. A total of 4 G5N1 prototypes were built.