The Nakajima G5N Shinzan (深山, "Deep Mountain") was a four-engined, long-range heavy bomber designed and built for the Imperial Japanese Navy prior to World War II.

The Nakajima G5N Shinzan originated due to the Imperial Japanese Navy's interest in developing a long-range attack bomber capable of carrying heavy loads of bombs or torpedoes a minimum distance of 3,000 nmi (5,600 km; 3,500 mi).

[2] The design that emerged from this study was for an all-metal, mid-wing monoplane with fabric-covered control surfaces, powered by four 1,870 hp Nakajima NK7A Mamori 11 air-cooled radial engines driving four-bladed propellers.

[1] However, overall performance proved disappointingly poor due to a combination of excessive weight, the unreliability of the Mamori engines, and the complexity of the design.

[3] Data from Japanese Aircraft of the Pacific War[3]Famous airplanes of the world (1984)[4]General characteristics Performance Armament