There’s a fairly in depth look at scramjets in the latest edition of The Industrial Physicist. It’s got enough meat on it to be worth reading, though I have a visceral dislike of scramjets. It’s nothing to do with the technical merits – it’s just that they are yet another technology that’s constantly being held out as the technical breakthrough needed to bring down launch costs. Someday I suspect scramjet powered vehicles (at least missiles) will be practical. In the meantime they are a kind of interesting technology that’s worth understanding just for curiousity’s sake.

Incidentally, I’m not singling out scramjets here – space elevators also trigger my “here we go again” reaction. Ditto electromagnetic accelerators.