After the failure of the G5N the Imperial Japanese Navy decided to try to build another four engine bomber. It was to be able to fly deep into Allied territory to carry out its missions. In February 1943 Nakajima was asked to come up with a design for the bomber. The bomber was to be able to go 370 mph, carry 8,000 lbs of bombs, fly 4,600 miles, and climb to 26,000' in 10 minutes.
The G8N was an all metal design.
The wings were midway up the fuselage.
The G8N used a tricycle landing gear.
Armament was mounted in the sides, and in turrets located forward, in the back, in the belly, and in the tail.