RD-0243

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]

RD-0244 (РД-0244)

Country of origin	USSR
First flight	1981-12-27[1]
Designer	OKB-154[1]
Associated LV	RSM-54, Shtil'[1]
Status	Retired
Liquid-fuel engine
Propellant	N2O4[1] / UDMH[1]
Mixture ratio	2.6[2]
Cycle	Oxidizer Rich Staged combustion[1]
Configuration
Chamber	1[2]
Performance
Thrust	682 kilonewtons (153,000 lbf)[2]
Chamber pressure	27.5 megapascals (3,990 psi)[2]
Specific impulse, vacuum	310 s (3.0 km/s)[2]
Specific impulse, sea-level	280 s (2.7 km/s)[2]
Burn time	74 seconds[2]
Used in
RD-0243 Propulsion Module[3]

RD-0245 (РД-0245)

Country of origin	USSR
First flight	1981-12-27[1]
Designer	OKB-154[1]
Associated LV	RSM-54, Shtil'[1]
Status	Retired
Liquid-fuel engine
Propellant	N2O4[1] / UDMH[1]
Mixture ratio	2.6[4]
Cycle	Gas Generator[1]
Configuration
Chamber	4[4]
Nozzle ratio	14
Performance
Thrust	211 kilonewtons (47,000 lbf)[4]
Chamber pressure	14.7 megapascals (2,130 psi)[4]
Specific impulse, vacuum	300 s (2.9 km/s)[4]
Specific impulse, sea-level	280 s (2.7 km/s)[4]
Burn time	79 seconds[4]
Used in
RD-0243 Propulsion Module[3]

See also

• Space portal

• R-29RM Shtil
• Shtil'
• Rocket engine using liquid fuel