The study of rocket engines and motors has become fundamental during last years. In particular the simple idea of “space exploration”, with its political power, has been joined by other more economic aspects. The telecommunications industry is increasingly oriented towards the development of new satellites. That’s why the private industry of launchers is growing more and more, creating a new important market. The necessity of powerful, efficient, environmentally friendly, cheap and safe rockets is the new target in order to send into orbit the heaviest payload at the minimum cost. Just the small launchers industry needs nowadays new solutions, so far little considered, to be optimized.