A French company that contracted the development of the "Viking" liquid-fuel engines for the Ariane-4 and Ariane-5. (Matra Group and now EADS). Bringing together the European programs' engines.

-The “Viking-6” and -4B models for the Ariane-4 (the -4B went in the second stage) use N2O4/UH25 fuel.

"Aestus in Ariane-5"

-The "Aestus" is manufactured by Daimler-Benz Aerospace (contract with Astrium). It weighs 110 kg. and delivers a thrust of 27.3 KN at 10 bar of pressure in the chamber.

"Astrium-DBA Aestus"

-For the 2nd stage of the Ariane-5, the “Aestus” engine, with N2O4/MMH liquid fuel, was used. (see EADS - Propulsion System).

From Appendix 10: Below we show three new pictures of Astrium engines. One of the Aestus, which is already mentioned in the main text, and two other engines that do not appear in the main text: the Aestus II and the Astris.

"Astrium Aestus"

"Astrium Aestus II"

"Astrium Astris"