The '''RD-250''' ([[GRAU]] Index '''8D518''') is the base version of a dual-nozzle family of [[liquid-fuel rocket|liquid]] [[rocket engine|rocket engines]], burning [[Dinitrogen tetroxide|N<sub>2</sub>O<sub>4</sub>]] and [[Unsymmetrical dimethylhydrazine|UDMH]] in the [[Staged combustion cycle (rocket)|oxidizer rich staged combustion]] cycle. The RD-250 was developed by [[NPO Energomash|OKB-456]] for [[Mikhail Yangel|Yangel]]'s [[Yuzhmash|PA Yuzhmash]] [[ICBM]], the [[R-36 (missile)]] (8K67). Its variations were also used on the [[Tsyklon-2]] and [[Tsyklon-3]] launch vehicles. It was supposed to be used on the [[Tsyklon-4]], but since the cancellation of the project it should be considered as out of production.
