Promising early tests for variable-thrust landing engine

As part of ESA's Future Launchers Preparatory Program (FLPP), the first phase of hot-fire tests has been completed on a new, variable-thrust rocket engine in Warsaw, Poland. The engine is being developed by a Polish consortium investigating new designs for propellant valves and injectors that can vary the thrust of rocket engines powered by more sustainable and storable propellants. Such engines have great potential for use in future space missions and reusable rockets.