The Kalinin K-7 was a bomber and a transport aircraft built during the www1 in 1930s by the Soviet Union. It was an experimental aircraft and believed to be flown. It had an unconventional configuration with twin booms and large underwing pods housing fixed landing gear and machine gun turrets. The passenger version had seats arranged inside the 2.3-meter thick wings. It would have had the capacity for 120 passengers and 7000kg of mail in civil transport configuration.

Powered by eight engines with six at the leading edge and two at trailing edge of the wings.