RD-864

RD-864 (РД-864)
Country of origin Soviet Union
Date1976–1978
First flight31 October 1977
DesignerYuzhnoye Design Bureau
ManufacturerYuzhmash
ApplicationUpper stage
Associated LVR-36M UTTKh and Dnepr
StatusIn service
Liquid-fuel engine
PropellantN2O4 / UDMH
Mixture ratio1.8
CycleGas-generator
Configuration
Chamber4
Performance
Thrust
  • High thrust mode: 20.2 kN (4,500 lbf)
  • Low thrust mode: 8.45 kN (1,900 lbf)
Chamber pressure
  • High thrust mode: 4.1 MPa (590 psi)
  • Low thrust mode: 1.7 MPa (250 psi)
Specific impulse
  • High thrust mode: 309 s (3.03 km/s)
  • Low thrust mode: 298 s (2.92 km/s)
Burn timeUp to 600 seconds
Restarts25
Gimbal range±55°
Dimensions
Length4,020 mm (158 in)
Diameter1,420 mm (56 in)
Dry mass199 kg (439 lb)
Used in
R-36M UTTKh and Dnepr third stage
References
References[1][2][3][4][5][6][7][8][9]
RD-869 (РД-869)
Country of origin Soviet Union
Date1983–1985
First flightMarch 1986
DesignerYuzhnoye Design Bureau
ManufacturerYuzhmash
ApplicationUpper Stage
Associated LVR-36M2
PredecessorRD-864
StatusIn service
Liquid-fuel engine
PropellantN2O4 / UDMH
Mixture ratio1.8
CycleGas-generator
Configuration
Chamber4
Performance
Thrust
  • High thrust mode: 20.47 kN (4,600 lbf)
  • Low thrust mode: 8.58 kN (1,930 lbf)
Chamber pressure
  • High thrust mode: 4.1 MPa (590 psi)
  • Low thrust mode: 1.7 MPa (250 psi)
Specific impulse
  • High thrust mode: 313 s (3.07 km/s)
  • Low thrust mode: 302.3 s (2.965 km/s)
Burn timeUp to 700 seconds
Restarts50
Gimbal range±55°
Dimensions
Length4,020 mm (158 in)
Diameter1,420 mm (56 in)
Dry mass196 kg (432 lb)
Used in
R-36M2 third stage
References
References[1][5][6][10]

The RD-864 (GRAU: 15D177) is a Soviet liquid-fuel rocket burning unsymmetrical dimethylhydrazine (UDMH) fuel and dinitrogen tetroxide (N2O4) oxidizer in a gas-generator combustion cycle.[1] It has a four combustion chambers that provide thrust vector control by gimbaling each nozzle in a single axis ±55°. It is used on the third stage of the R-36M UTTKh (GRAU: 15A18) and Dnepr.[5] For the R-36M2 (GRAU: 15A18M), an improved version, the RD-869 (GRAU: 15D300) was developed.[1][6][10][11] The MEA is an evolution of the RD-869 used on the Vega C.[12]

  1. ^ a b c d Cite error: The named reference aviadvigatel was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference b14643-dneprpropulsion was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference ea-dnepr was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference ea-r3615a18 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference ea-rd864 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference ea-rd869 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference kosmo-dniepr3 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference yuzhnoye-dnepr was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference yuzhmash-dnepr was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference ea-r365a18m was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference yuzhnoye-60years was invoked but never defined (see the help page).
  12. ^ "Vega C Users Manual" (PDF). Arianespace. May 2018. p. 1-6. Retrieved 2024-07-08.