Aestus

Aestus is a hypergolic liquid rocket engine used on an upper stage of Ariane 5 family rockets for the orbital insertion. It features unique design of 132 coaxial injection elements causing swirl mixing of the MMH propellants with nitrogen tetroxide oxidizer. The pressure-fed engine allows for multiple re-ignitions.

Aestus
Country of originGermany
First flight30 October 1997
Last flight25 July 2018
DesignerOttobrunn Space Propulsion Centre
ManufacturerAstrium
ApplicationUpper stage engine for the orbital insertion of heavy payloads
Associated LVESA
SuccessorAestus II
StatusRetired
Liquid-fuel engine
PropellantNitrogen tetroxide (N2O4) / MMH
Mixture ratio1.9
CyclePressure-fed engine
Configuration
Nozzle ratio84
Performance
Thrust, vacuum29.6 kN (6,654 lbf)
Chamber pressure11 bar
Specific impulse, vacuum324 s (3.18 km/s)
Burn time1100s
Dimensions
Length2.20 m
Diameter1.31 m
Dry weight111 kg
Used in
Ariane 5 G and ES
Ariane 6.1 (proposed)
References
References
Aestus II / RS-72
Country of originGermany, United States
DesignerOttobrunn Space Propulsion Centre, Pratt & Whitney Rocketdyne
ManufacturerAstrium, Pratt & Whitney Rocketdyne
ApplicationUpper stage engine for the orbital insertion of heavy payloads
Associated LVESA
PredecessorAestus
StatusIn development
Liquid-fuel engine
PropellantNitrogen tetroxide (N2O4) / MMH
Mixture ratio1.9
CyclePump-fed engine
PumpsXLR-132
Configuration
Nozzle ratio84
Performance
Thrust, vacuum55.4 kN (12,450 lbf)
Chamber pressure60 bar
Specific impulse, vacuum340 s (3.3 km/s)
Burn time600s
Dimensions
Length2.29 m
Diameter1.31 m
Dry weight138 kg
References
References
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