> Those wings are useful at mach 0.7 and much less useful at mach 2 and a loss-creating pain in the ass at mach 5. You need to get to mach >20, and the longer i

> Those wings are useful at mach 0.7 and much less useful at mach 2 and a loss-creating pain in the ass at mach 5. You need to get to mach >20, and the longer it takes you to do so, the more you pay to the aero and gravity gods. If you stay at the same altitude. You are arguing by analogy with aircraft and hypersonic missiles designed to stay in the atmosphere, not to efficiently climb above most of it.