As requested, here's a quick tutorial on the Scramjet: It should cover at least the basics; I don't really have much experience writing tutorials, so if there are any glaring deficiencies, let me know and I'll set about correcting them. @JBrown247: I can take a look at the CTT patch - if 1.2 changed things in the tech tree I should do that anyway, but the only engine I can think of offhand that would produce that much thrust is the Mk3 TurboRamjet from Mk3 Expansion, though considering the less finished nature of M3X it's possible that it isn't where it's supposed to be.
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