The K-7's very brief first flight showed up instability and serious vibration caused by the airframe resonating with the engine frequency.
The solution to this 'flutter' was thought to be to shorten and strengthen the tail booms, little being known then about the natural frequencies of structures and their response to vibration.


On the eleventh flight, during a speed test, the port tail boom vibrated, fractured, jammed the elevator and caused the giant aircraft to plunge to the ground, killing 15.





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