From Wikipedia, the free encyclopedia. In other projects Wikimedia Commons. The K-7 was built in two years in Kharkov , starting in Giants of the sky: the biggest aeroplanes of all time. The very brief first flight showed instability and serious vibration caused by the airframe resonating with the engine frequency. Designed by World War I and Civil War pilot Konstantin Kalinin at the aviation design bureau he headed in Kharkiv the K-7 was one of the biggest aircraft built before the jet age.
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