"Lacpat II is a logical follow-up of the previous EC-project which has as objective to reduce antipodal flights to less than 2 to 4 hours. Among the several studied vehicles, only two novel aircraft for a Mach 5 and 8 flight are retained in the present proposal. Starting from the available Mach 5 vehicle and its related precooled turboramjet, assumed performance figures of different components ...