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The Storable Propulsion Technology Demonstrator helps develop technologies for a rocket engine in the thrust range between 3–8 kN. The technology developed in this project can be used in upper stages of small launchers or applications with similar thrust requirements like exploration missions or lander engines. The demonstrator uses novel cooling-, injector- and damping technologies.
As of 2016, it has successfully performed two test campaigns, performing both ground level as well as vacuum ignitions. Steady state behaviour was tested in a large range of operating points and for durations of up to 110 seconds.
In addition, combustion stability and thrust chamber length variations were tested.
Future developments will investigate options to adapt the engine for the combustion of storable green propellants which are more environmentally friendly and drastically reduce the necessary safety precautions for propellant handling.