Future European Expendable Launcher Options and Technology Preparation

Kurzfassung

The paper describes latest results of the most recent activities in Germany in the technical assessment of future European launcher architecture. In a joint effort of DLR-SART with German launcher industry a next generation upper-medium class expendable TSTO and options for new liquid fuel upper stages for the small VEGA-launcher are addressed. The WOTAN study has investigated fully cryogenic launchers as well as those with a combination of solid and cryogenic stages, fulfilling a requirement of at least 5000 kg single payload into GTO. With this study finished, final performance data as well as critical technical and programmatic issues are presented. The VENUS research on potential new VEGA upper stages is now focused on storable and on Vinci-based cryogenic propulsion and includes not only the VEGA solid propellant lower composite, but also its potential more powerful future upgrade. In its second part the paper gives an overview on advanced cryogenic upper-stage technologies presently under investigation in Germany. A research cooperation of German launcher industry, university academia and DLR has been initiated to work jointly on various identified needs.