RHEA, lays the foundation for future hybrid rocket engine developments at ARIS. The built test infrastructure is expandable to thrusts up to 20 kN. RHEA’s first-generation engine focuses on high safety factors and a high degree of modularity to test a variety of different key parameters. A perfect baseline to scale up the engine and make it flight-ready in the future. RHEA’s successor IRIDE is currently under development and will deliver 5kN of thrust.