I don’t have time to answer this email query, but perhaps some of the other readers do, in comments:

I loved your article about the Hyper X 43 and scramjets in genral, it was amazingly informative. As an amatuer space enthusiast I try to keep up, some of the stuff is completely out of my league. I had some questions, even if a singlestage could be built, would it be able survive re-entry? Second, even though Rutan’s Spaceship one did in fact go to 62k up, didn’t all the x-15’s do the exact same thing? Could the feathering device that Spaceship one uses be applied to a space craft coming in from low-orbit or is that type of system restricted forever to sub-orbital manuevering? if not is the composite material shell of the Spaceship as effective or even in the same league as Shuttle’s tiles? and finally, with the weight of turbofans and some kind of orbital manuevering system and reaction control system, could the design or anything like the design of the Spaceship One work off taking us to the runway to low orbit system that we only dream of in science fiction.