The LAPCAT 2 program, led under ESA/ESTEC technical coordination in the European Union Framework Program FP7, aims at preliminary designing a high-speed civilian transport airplane able to perform very long range and at acquiring some associated necessary knowledge. Two options are considered : one airplane cruising at Mach 5 and another cruising at Mach 8.For the Mach 8 cruiser, and in a first step, different concepts are studied by different program partners : two using TBCC propulsion system, two others using RBCC propulsion systems.In that frame, MBDA is performing a preliminary design of a fully axisymmetric vehicle using existing turbojets for subsonic flight then a liquid rocket system for acceleration up to Mach 1.5/2 and finally a dual-mode ramjet to reach Mach 8 and cruise over 18 000km.