Yuri Vasilievich Kondratyuk

1897–1941, born in Poltava, Ukraine, Russian Empire

Kondratyuk studied mathematics and physics at an early age and attended engineering school in St. Petersburg before World War I. He later joined Friedrich Tsander and Konstantin Tsiolkovsky to spread the idea of rocketry. He participated in engineering projects and discussed four-stage liquid-oxygen and hydrogen rockets and space elevators.

Yuri Vasilievich Kondratyuk, born in Poltava, Ukraine, in 1897, joined Tsander and Tsiolkovsky in spreading the idea of rocketry.