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RD-0245 (РД-0245)
Country of origin	USSR
First flight	1981-12-27
Designer	OKB-154
Associated LV	RSM-54, Shtil'
Status	Retired
Liquid-fuel engine
Propellant	N2O4 / UDMH
Mixture ratio	2.6
Cycle	Gas Generator
Configuration
Chamber	4
Nozzle ratio	14
Performance
Thrust	211 kilonewtons (47,000 lbf)
Chamber pressure	14.7 megapascals (2,130 psi)
Specific impulse, vacuum	300 s (2.9 km/s)
Specific impulse, sea-level	280 s (2.7 km/s)
Burn time	79 seconds
Used in
	RD-0243 Propulsion Module

RD-0244 (РД-0244)
Country of origin	USSR
First flight	1981-12-27
Designer	OKB-154
Associated LV	RSM-54, Shtil'
Status	Retired
Liquid-fuel engine
Propellant	N2O4 / UDMH
Mixture ratio	2.6
Cycle	Oxidizer Rich Staged combustion
Configuration
Chamber	1
Performance
Thrust	682 kilonewtons (153,000 lbf)
Chamber pressure	27.5 megapascals (3,990 psi)
Specific impulse, vacuum	310 s (3.0 km/s)
Specific impulse, sea-level	280 s (2.7 km/s)
Burn time	74 seconds
Used in
	RD-0243 Propulsion Module

The RD-0243 (Russian: Ракетный Двигатель-0243, romanized: Raketnyy Dvigatel-0243, lit. 'Rocket Engine 0243') is a propulsion module composed of an RD-0244 main engine and a RD-0245 vernier thruster. Both are liquid-fuel rocket engines, burning a hypergolic mixture of unsymmetrical dimethylhydrazine (UDMH) fuel with dinitrogen tetroxide (N₂O₄) oxidizer. The RD-0244 main engine operates in the oxidizer rich staged combustion cycle, while the vernier RD-0245 uses the simpler gas generator cycle. Since volume is at a premium on submarine launches, this module is submerged on the propellant tank.^[3] Its development period was from 1977 to 1985, having had its first launch on December 27, 1981. Originally developed for the RSM-54, it was used later for the Shtil'.^[1]

References

^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m "RD-0243, RD-0244, RD-0245. Sea-based missile RSM-54". KBKhA. Archived from the original on 4 May 2014.
^ ^a ^b ^c ^d ^e ^f ^g "RD-0244". Encyclopedia Astronautica. Archived from the original on 2015-08-24. Retrieved 2015-06-18.
^ ^a ^b ^c "RD-0243". Encyclopedia Astronautica. Archived from the original on 2015-08-24. Retrieved 2015-06-18.
^ ^a ^b ^c ^d ^e ^f ^g "RD-0245". Encyclopedia Astronautica. Archived from the original on 2015-08-24. Retrieved 2015-06-18.