The present work main topic is the preliminary design of a new mini launcher. The report describes step by step the the path followed during the analysis and calculations, starting from the very basics: identify the goals, motivations and main parameters behind such a project. The introduction chapter explains motivations and key targets that lays the foundations of the new launcher concept. To gather information about the state of the art regarding small lift launchers and sounding rockets a survey was carried out: it was very helpful to understand what values to expect and to locate a possible starting point. HyImpulse main purpose is the development of a complete hybrid propelled mini launcher: team and background are briefly presented before the start of the design process description.