Prometheus – Behind The Black

Europe successfully tests rocket engine to be used in its first reusable rocket

June 28, 2023 9:31 am Robert Zimmerman

The European Space Agency (ESA) on June 22, 2023 successfully completed a 12-second static fire test of the Prometheus rocket engine it plans to use in its first reusable rocket.

The engine, like SpaceX’s Raptor-2 engine for Starship/Superheavy, uses methane as its fuel. The plan is to use it in a future rocket to replace or upgrade the Ariane-6 rocket, still being developed, with the ability to vertically land and reuse the first stage. The plan after this first round of static fire tests is complete is to begin to do short vertical hop tests next year, similar to the Grasshopper tests SpaceX did as it developed the Falcon 9.

However, the following quote from the article indicates their are some limitations to the engine:

According to CNES, the new engine will be reusable up to five times and can deliver variable thrusts of up to 100 tonnes.

SpaceX builds its Merlin and Raptor engines with the goal of many more reuses than this. Possibly this number is simply a conservative estimate that will change once the engine is operational. If all goes as planned, ESA hopes to have this new reusable rocket flying by 2026, at the earliest.

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ESA commits $91 million to reusable rocket engine development

February 1, 2017 7:32 pm Robert Zimmerman

The competition heats up? Despite a general lack of interest in reusability, the ESA has now committed $91 million to develop a new low cost prototype reusable rocket engine.

In an interview with SpaceNews, Airbus Safran Launchers CEO Alain Charmeau said FLPP is allocating 85 million euros ($91 million) to Prometheus to fund research and development leading to a 2020 test firing. Now that Prometheus is an ESA program, Charmeau expects more countries will get involved. “ESA will pay the contract to Airbus Safran Launchers and then Airbus Safran Launchers will cooperate with European industry, of course France and Germany, but we will have also contributions from Italy, Belgium, Sweden and probably a couple of others to a smaller extent,” Charmeau said.

This project reminds me of many NASA development projects. The agency spends the money to do a test firing, but the prototype is never used and gets abandoned as soon as the test is completed.

Things might change, however, come the 2020s. By then I think American companies will be quite successful in their effort to create reusable rockets, and that will leave Europe in the lurch competitively. Their solution at this time for combating that future competition however is not getting more competitive. Instead, as noted in the article at the link, Airbus Safran, the company building Ariane 6, wants the ESA to compel its members to use their rocket, regardless of cost.