Engine designed by Astrium. This rocket engine uses N2O4 / MMH and gives 2950 Kgf of thrust.

“Aestus”

-They were used in the upper stage of the Ariane 5. The first models were not able to start several times.

-It seems that the name "Aestus" comes from a Rocketdyne design for DASA and at first it was the name of a gas generator for the main rocket engine's feed pumps and later this name was applied to an Ariane 5 engine designed by Astrium.

-As stated before, the Aestus engine is used in the Ariane 5 carrier, built by DASA (Daimler.Chrysler), Daimler-Aerospace-AG.

-Currently and in cooperation with Boeing (Rocketdyne) they are developing the Aestus II.

-In fact, Boeing-Rocketdyne is offering it as RS-72, slightly more developed than the Aestus II itself.

-Part of this evolution is in the fuel feed, that changed from using tank pressurization to using a turbo pump.