The main objective of the RETALT project is to investigate launch system re-usability technologies for two types of vehicles.
Operational launch vehicle
Vertical Take-off Vertical Landing (VTVL) Two Stage To Orbit (TSTO)
Similar to the Falcon 9
Future launch vehicle
Vertical Take-off Vertical Landing (VTVL) Single Stage To Orbit (SSTO)
Similar to the DC-XA