Initiated in 2010 the Unitary Motor (UM) propulsion demonstrator was developed within the Future Launchers Preparatory Programme (FLPP).
Following several small scale tests the first large scale hot fire test was successfully achieved in 2014. The hybrid engine combines liquid hydrogen peroxide with solid HTPB fuel and reaches a thrust level of 30 kN. It will power the Nucleus demonstrator, a single stage sounding rocket, developed around the engine for in-flight testing in the near future.