1. A tank with wings
This Russian made airplane, the Kalinin K-7, is more of a tank than a plane, really. The plane was built in 1931 in the Soviet Union, made entirely out of Soviet steel. It was designed by Konstantin Kalinin and housed an enormous machine gun, along with several additional turrets. The plane successfully completed 7 test flights, but unfortunately crashed on its 8th flight. Its development was abandoned in 1935.
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