The Soviet Heavy Bomber K-7 Built in Russia during the 1930s. It flew 11 times before crashing and killing 15 people. The designer, Konstantin Kalinin, wanted to build two more aircraft, but the project was scrapped. Later Stalin had Kalinin executed. Evidently it was not good to fail on an expensive project under Stalin. It has propellers on the back of the wings, too. You can count 12 engines facing front. The size would be equivalent to the Empire State Building on its side, with cannon. And you think the 747 was big... not only a bunch of engines but check out the cannons. In the 1930s the Russian army was obsessed with the idea of creating huge bombers. At that time they were designed to have as many propellers as possible to help carry the huge flying fortresses into the air. Jet propulsion had not been invented. Not many photos were saved from those times, because of the high secrecy levels of such projects and because a lot of time has passed. Still the attached photos show one of these monsters - the heavy bomber K-7.