Encyclopedia Astronautica
Ariane 5 EPS L10


German space tug. Study 2003. Upper stage / space tug - in production. Launched by Ariane 5V. 250 kg additional propellant compared to Ariane 5G version.

Upper stage engine for Ariane 5. Pressure (helium) fed. Electromechanical gimbaled nozzle (9.5 deg). Original version could not be restarted; version for EPS L10 stage for Ariane 5V allowed multiple restarts.

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.

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...

See also
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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