POLARIS develops a series of linear aerospike rocket engines to power our spaceplanes as well as scaled demonstrators. Aerospike engines promise significant efficiency increases compared to conventional rocket engines. Moreover, the linear aerospike engines under development at POLARIS enable a very efficient engine/airframe integration for the flat-shaped flying wing configuration of our spaceplanes.

Ground testing of our first LOX/kerosene linear aerospike has started in November 2023. Flight testing is to follow soon. The flight demonstrator MIRA is to become the first aerospace vehicle ever to operate a linear aerospike rocket engine in flight.

Parts of our aerospike activities are conducted under Bundeswehr (German Armed Forces) study contracts.