Conveyor NB-36
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A nuclear chain reaction could be caused by a nuclear reactor. In the 1950s, despite the risks, an airplane with a nuclear reactor was built. Only 47 flights were ever made with the airplane.
PZL M-15 Belphegor
The PZL M-15 Belphegor was not only the first biplane ever built, but also the ugliest. The plane had twin booms, fenders, and a 377-gallon chemical tank that made it a pesticide aviator. Jet engines were more expensive than expected.
