RD-215

RD-215 (РД-215)
Country of origin	Soviet Union
Date	1958-1960
Designer	OKB-456, V.Glushko
Associated LV	R-14, Kosmos-3 and Kosmos-3M
Status	Retired
Liquid-fuel engine
Propellant	AK-27I / UDMH
Mixture ratio	2.5
Configuration
Chamber	2
Nozzle ratio	18.8
Performance
Thrust, vacuum	887 kN (199,000 lbf)
Thrust, sea-level	740 kN (170,000 lbf)
Chamber pressure	7.355 MPa (1,066.8 psi)
Specific impulse, vacuum	289 s (2.83 km/s)
Specific impulse, sea-level	246 s (2.41 km/s)
Dimensions
Length	2,205 mm (86.8 in)
Diameter	2,260 mm (89 in)
Dry mass	575 kg (1,268 lb)
Used in
	R-14, Kosmos-3 and Kosmos-3M first stage
References
References

The RD-215 (Russian: Ракетный Двигатель-215, romanized: Raketnyy Dvigatel-215, lit. 'Rocket Engine 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 [N₂O₄] 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:

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.

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	7.355 MPa (1,066.8 psi)
Thrust, vacuum	887 kN (199,000 lbf)	887 kN (199,000 lbf)	890 kN (200,000 lbf)
Thrust, sea level	740 kN (170,000 lbf)	740 kN (170,000 lbf)	742.8 kN (167,000 lbf)
I_sp, vacuum	289 s (2.83 km/s)	289 s (2.83 km/s)	291.3 s (2.857 km/s)
I_sp, sea level	246 s (2.41 km/s)	246 s (2.41 km/s)	248 s (2.43 km/s)
Burn time	146s	N/A	N/A
Length	2,205 mm (86.8 in)	2,205 mm (86.8 in)	2,205 mm (86.8 in)
Diameter	2,260 mm (89 in)	2,260 mm (89 in)	2,260 mm (89 in)
Dry weight	575 kg (1,268 lb)	575 kg (1,268 lb)	570 kg (1,260 lb)
Use	R-14 (8K65), Kosmos-1 and Kosmos-3	R-14U (8K65U)	Kosmos-3M

1 2 3 4 5 6 7 8 9 10 11 "NPO Energomash list of engines". NPO Energomash. Archived from the original on 7 November 2014.
1 2 3 4 5 "RD-216". Encyclopedia Astronautica. Archived from the original on June 26, 2002. Retrieved 2015-06-26.
1 2 "R-14". Encyclopedia Astronautica. Archived from the original on March 9, 2003. Retrieved 2015-06-26.
↑ Zak, Anatoly. "Cosmos-1, 3, 3M and 3MU". RussianSpaceWeb.com. Retrieved 2016-07-05.
↑ Krebs, Gunter Dirk (2016-04-22). "Kosmos-1/-3/-3M". Gunter's Space Page. Retrieved 2016-07-05.
↑ Nicolas, Pillet (2013-07-20). "Cosmos-3 Description du lanceur" [Kosmos 3 Launcher Description] (in French). Kosmonavtika. Retrieved 2016-07-05.
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