RD-215

The RD-215 (, GRAU index: 8D513) was a dual nozzle liquid-fuel rocket engine, burning a hypergolic mixture of unsymmetrical dimethylhydrazine (UDMH) fuel with AK-27 oxidizer (a mixture of 73% nitric acid and 27% dinitrogen tetroxide [] with iodine as a passivant). It was used in a module of two engines (four nozzles) known as the RD-216 (GRAU index: 8D514). The RD-215 was developed by OKB-456 for Yangel's Yuzhmash R-14 (8K65) ballistic missile. Its variations were also used on the Kosmos-1, Kosmos-3 and Kosmos-3M launch vehicles.

Versions The family incorporate many versions:Article title RD-215 (GRAU index: 8D513): Original design for the R-14 (8K65). Used also on the Kosmos-1 and Kosmos-3 RD-215U (GRAU index: 8D513U): Improved engine for the R-14U (8K65U). RD-215M (GRAU index: 8D513M): Improved version used on the Kosmos-3M. RD-218 (GRAU index: 8D515): Modified design for the R-16 (8K64) first stage. RD-219 (GRAU index: 8D713): Modified design for the R-16 (8K64) second stage.

Modules These engines were bundled into modules of pairs of engines. The serial production modules were: RD-216 (GRAU index: 8D514): Bundle of two RD-215, used on the R-14 (8K65), Kosmos-1 and Kosmos-3 first stage. RD-216U (GRAU index: 8D514U): Bundle of two RD-215U, used on the R-14U (8K65U) first stage. RD-216M (GRAU index: 8D514M): Bundle of two RD-215M, used on the Kosmos-3M first stage. RD-218 (GRAU index: 8D712): Bundle of three RD-217, powers the R-16 (8K64) first stage.

+ RD-215 Family of Engines Engine RD-215 RD-215U RD-215M GRAU 8D514 8D514U 8D514M Development 1958-1960 1960-1961 1966-1968 Propellant AK-27I (73% nitric acid, 27% N2O4, and iodine passivant) / UDMH Combustion chamber pressure Thrust, vacuum Thrust, sea level I, vacuum I, sea level Burn time 146s N/A N/A Length Diameter Dry weight Use R-14 (8K65), Kosmos-1 and Kosmos-3 R-14U (8K65U) Kosmos-3M

RD-215

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