European rocket engine using hydrogen peroxide and ethanol passes tests

In Germany, the new European rocket engine Greta has completed a hot-fire test campaign, demonstrating stable operations, shutdowns and multiple restarts on a mobile test stand developed by ArianeGroup for the European Space Agency at ArianeGroup’s Trauen site in Germany.

Greta uses hydrogen peroxide and ethanol as propellants, a more sustainable alternative with a lower carbon footprint compared to monomethyl hydrazine propellant used by most traditional rocket engines in this thrust range.

Greta was ignited multiple times from July to November 2025 and showed stable operations, including controlled shutdowns. During the test campaign the engine fired continuously for over 40 seconds at a time.

Tags: ethanol, European rocket engine Greta, Germany

Category: Fuels