Encyclopedia Astronautica

Rocketdyne / DASA N2O4/MMH rocket engine. 60 kN. Production. Restartable upper-stage engine, began test firings at Lampoldshausen in February 2000.

Rocketdyne worked with DaimlerChrysler Aerospace in developing the Aestus-2 storable-propellant, restartable upper-stage engine, which began test firings at Lampoldshausen (Germany) early in February 2000 and was subjected to a second six-week test series run by Rocketdyne in March/April of the same year at White Sands (USA). Aestus-2 was being developed with private funding by the two companies, allowing it to be marketed to all potential users. Its principal potential use was in Ariane-5's new Versatile upper stage. At 60 kN, Aestus-2 has twice the thrust of the current Aestus upper-stage engine of Ariane-5. When used with the new Versatile upper stage, Aestus-2 could boost the advanced Ariane-5's payload to geostationary orbit from 8,000 kg to 8,600 kg, in addition to providing the mission flexibility offered by a restartable engine.

Restarts: 3.

Status: Production.
Thrust: 60.00 kN (13,488 lbf).

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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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