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The Convair X-6 was an experimental aircraft project to develop and evaluate a nuclear-powered jet aircraft.
Experiments were carried out on a testbed aircraft named Convair NB-36H, based on the B-36 bomber. The program was canceled before the actual X-6 and its nuclear reactor engines were completed. The X-6 was part of a larger series of programs that ran from 1946 through 1961, and cost 7 billion USD.
The basic idea was that nuclear-powered strategic bombers would be able to stay airborne for weeks at a time, as their range would not be limited by liquid jet fuel.