Hi! New dicovery.
Sweeping airplane for Fugaku formation escort.
This aircraft was designed by Nakajima aircraft Ohta factory in 1943.
One more same aircraft design is exist designed by Nakajima aircraft Koizumi factory.
http://www.sankei.com/premium/photos/170609/prm1706090009-p7.html
http://www.sankei.com/premium/news/170609/prm1706090009-n1.html
"There are two kinds of design drawings of the found sweeping aircraft, which was made in 1943. Both were equipped with 400 machine guns in tandem on the abdomen of the fuselage. The two types had different sizes. Two types were designed by the Nakajima Aircraft Ota factory which had been building army airplanes and by the Nakajima aircraft Koizumi factory which had been building Navy aircraft.
Ohta factory design was made in January 1943. The equipped weapon and the total weight including 13 passengers are 57.5 tons, the speed is 543 km / h. Some officials consider it to have been expected as a transport aircraft utilizing huge aircraft other than escort aircraft. For Japan, transport aircraft were indispensable for sending new troops etc. instead of ships to the United States.
On the other hand, Koizumi's sweeping aircraft designed three months later than the Ota factory in April 1943. Overall weight 90 tons, occupant 10 people. The speed at altitude 13,000 meters could be up to 800 km/h, 400× 7.7mm guns or 150×20 cannon could be installed. For escort specialization, it was supposed to sharpen the power of enemy ship and enemy aircraft by gun sweep during battle."
Bottom drawing shows Koizumi design?