X-43A: NASA's Mach 10 Scram Jet

If you absolutely positively HAVE to get there at Mach 10, then this is your ride. I'm sure it'll even have vintage Black Sabbath cued up in the CD player.
Deanosays...

Scramjets look like they will be hard to mould into an everyday working technology though;

From http://en.wikipedia.org/wiki/Scramjet

"However, scramjets have weight and complexity issues that must be considered. While very short suborbital scramjet test flights have been successfully performed, perhaps significantly no flown scramjet has ever been successfully designed to survive a flight test. The viability of scramjet vehicles is hotly contested in aerospace and space vehicle circles, in part because many of the parameters which would eventually define the efficiency of such a vehicle remain uncertain. This has led to grandiose claims from both sides, which have been intensified by the large amount of funding involved in any hypersonic testing. Some notable aerospace gurus such as Henry Spencer and Jim Oberg have gone so far as calling orbital scramjets "the hardest way to reach orbit", or even 'scamjets' due to the extreme technical challenges involved. Major, well funded projects, like the X-30 were cancelled before producing any working hardware."

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