Nakajima G10N Fugaku - gunship (post above) Project Z called for three variations on the airframe: heavy bomber, transport (capable of carrying 300 troops), and a gunship armed with forty downward-firing machine guns in the fuselage for intense ground attacks at the rate of 640 rounds per second (i.e. 38,400 rounds per minute).
interesting concept - 40 downward firing guns
A .303 shell weighs 14 grams ? - In one minute:
- 38400 x 14 = 537,600 grams
= 1/2 a tonne