Rheological, optical, and ballistic investigations of paraffin-based fuels for hybrid rocket propulsion using a two-dimensional slab-burner M. Kobald, E. Toson, H. Ciezki, S. Schlechtriem, S. di Betta, M. Coppola and L. DeLuca Published online: 06 July 2016 DOI: 10.1051/eucass/201608263