Dieter Jacob & Gottfried Sachs 
Basic Research and Technologies for Two-Stage-to-Orbit Vehicles [PDF ebook] 
Collaborative Research Centres

Focusing on basic aspects of future reusable space transportation systems and covering overall design, aerodynamics, thermodynamics, flight dynamics, propulsion, materials, and structures, this report presents some of the most recent results obtained in these disciplines. The authors are members of three Collaborative Research Centers in Aachen, Munich and Stuttgart concerned with hypersonic vehicles.
A major part of the research presented here deals with experimental and numerical aerodynamic topics ranging from low speed to hypersonic flow past the external configuration and through inlet and nozzle. Mathematicians and engineers jointly worked on aspects of flight mechanics like trajectory optimization, stability, control and flying qualities. Structural research and development was predominantly coupled to the needs for high temperature resistant structures for space vehicles.

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Preface
Network Organization of Collaborative Research Centers for Scientific Efficiency Enhancement
Overall Design Aspects
Aerodynamics and Thermodynamics
Propulsion
Flight Mechanics and Control
High-Temperature Materials and Hot Structures
Cooperation with Industry and Research Establishments, Participation in National and International Research Programs
Conclusions and Perspectives
Appendix