Prometheus is an all-new design featuring variable thrust, multiple ignition capability and intelligent onboard control systems. Additive layer manufacturing – so-called 3D printing – features extensively, reducing the number of parts, speeding up production and reducing waste. This highly versatile engine will be suitable for use on core, booster and upper stages of Europe’s future launch vehicles.

For this test campaign, which began with an initial thrust chamber ignition as a prelude to longer-duration trials, Prometheus is burning liquid oxygen-methane fuel. Liquid methane fuel is clean burning and simplifies handling, to help enable reusability and reduce the cost of ground operations before and after flight. A version using liquid hydrogen-liquid oxygen is also being developed.

ESA Head of Future Space Transportation Rüdeger Albat said: “Prometheus is one of the most exciting new technology development projects in Europe today. We are showing the way to a low-cost future for space operations based on 100% European technology.”