Encyclopedia Astronautica
Ariane 5 EPS L10

N2O4/MMH propellant rocket stage. Loaded/empty mass 12,750/2,750 kg. Thrust 27.40 kN. Vacuum specific impulse 324 seconds. 250 kg additional propellant compared to Ariane 5G version.

Status: In development.
Gross mass: 12,750 kg (28,100 lb).
Unfuelled mass: 2,750 kg (6,060 lb).
Height: 3.36 m (11.02 ft).
Diameter: 3.96 m (12.99 ft).
Span: 5.46 m (17.91 ft).
Thrust: 27.40 kN (6,160 lbf).
Specific impulse: 324 s.
Burn time: 1,100 s.
Number: 9 .

More... - Chronology...

Associated Countries
Associated Engines
  • Aestus Friedrichshafen N2O4/MMH rocket engine. 29 kN. In production. Isp=324s. Upper stage engine for Ariane 5 developed 1988 - 1995. Original version could not be restarted; version for EPS L10 stage for Ariane 5V allowed multiple restarts. First flight 1996. More...

Associated Launch Vehicles
  • Ariane 5 V French orbital launch vehicle. Version of the evolved Ariane 5 using a version of the EPS storable propellant stage instead of a new Lox/LH2 stage. Result is a payload to GTO of 8 tonnes. The use of the new Aestus restartable engine in the upper stage fitted the vehicle for space station logistics missions or launch of space probes requiring complex orbital maneouvres. More...

Associated Propellants
  • N2O4/MMH Nitrogen tetroxide became the storable liquid propellant of choice from the late 1950's. Monomethylhydrazine (CH3NHNH2) is a storable liquid fuel that found favour in the United States for use in orbital spacecraft engines. Its advantages in comparison to UDMH are higher density and slightly higher performance. More...

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