Thanks! I found more information here: http://esamultimedia.esa.int/multimedia/publications/europe-launchers/pageflip.html http://esamultimedia.esa.int/multimed

Thanks! I found more information here: http://esamultimedia.esa.int/multimedia/publications/europe-launchers/pageflip.html http://esamultimedia.esa.int/multimedia/publications/europe-... (Particularly on "why such launchers?" Who takes part in which, and the re-entry vehicle.)