The ZEpHyR 2 rocket is an enhancement of the ZEpHyR 1. The preliminary design has a diameter of 0.24 metres and a length of 6 metres. Due to the higher mass of the rocket the motor has more thrust of up to 6500 newton. The motor still utilises paraffin as fuel and liquid oxygen as oxidiser. ZEpHyR 2 will still use a pressure regulated feed system with helium as pressurisation gas. The main challenges of the development of ZEpHyR 2 will be the upscaling of the hybrid rocket motor, the optimisation of its efficiency, the reduction of the structural mass and the design of the recovery system.
The launch of ZEpHyR 2 is scheduled for 2020.