Press release

Prometheus® development accelerates with new contract from ESA 05-17-2021 |  3 minutes

  • The European Space Agency (ESA) has just awarded ArianeGroup a new 135 million euro contract to begin a new phase with the development of a set of Prometheus® demonstrators
  • This new contract follows on from the December 2017 contract which launched the development at European level of very low cost, reusable engine demonstrators with thrust control
  • Up to 70% of Prometheus® is built using 3D printing, enabling development of the latest  propulsion technologies for future European launchers

The European Space Agency (ESA) has awarded ArianeGroup a new 135 million euro contract to continue the development of a set of reusable, very low cost Prometheus® engine demonstrators.

Building on the results already achieved, the purpose of this new contract is to finalize the demonstration phase with hot-fire tests of the first two prototypes on the DLR site in Lampoldshausen, Germany, and to design an improved version of the engine, capable of delivering a thrust of 120 metric tons, compared with the current 100 tons, as well as a liquid hydrogen version. Initially designed to run on a mixture of methane and liquid oxygen, the liquid hydrogen-oxygen version of Prometheus® could be used as early as 2025 on an Ariane 6 upgrade. The contract also calls for the production of a pre-series of engines to begin the pre-industrialization phase, while continuing to test new series production processes.

This will enable Prometheus® to meet the needs of all applications and all missions.
André-Hubert Roussel CEO of ArianeGroup

This new contract validates the quality of the work already done by our Franco-German teams in developing a new family of very low cost engines in a totally innovative way. The thrust control feature of these engines paves the way for reusable launchers. With the first Prometheus® prototype now being assembled at our Vernon site, the knowledge we have acquired will enable us to develop lighter, much less expensive engines, making European launchers ever more competitive and environmentally friendly.”

These will be the first European engines with controlled combustion, enabling them to adapt to launcher flight conditions during the various phases of the mission. A digital system will provide control over a range from 30 to 100% maximum thrust. Prometheus® will also be equipped with Artificial Intelligence and a Health Monitoring system that will enable a diagnostic of the engine’s operation at any time.

The Prometheus® demonstrators will benefit from the latest additive manufacturing technologies, with the parts produced in this way accounting for 70% of the total mass of the engine, including the combustion chamber, which is entirely built using 3D printing at the ArianeGroup site in Ottobrunn, Germany. 

Prometheus® was initiated in 2015 with the French space agency CNES and covered by an ESA contract since 2017. Its production costs in the 100-ton thrust class will be 10 times lower than that of the current Vulcain 2 engine for Ariane 5.

A version of Prometheus© can also be fitted to equip the Themis reusable stage demonstrator.

Press contacts:

Astrid EMERIT – T. +

Julien WATELET – T. +33.6