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Saved by uncleflo on June 3rd, 2014.
A Mach 10 plane capable of rapid turnaround between missions will need to be pretty tough to resist the heat generated as it bores through the atmosphere at hypersonic speed. In DARPA's view this will be pretty much as bad as the frying the space shuttle used to suffer and the X-37B still does. The XS-1 will need "low-maintenance thermal protection systems that provide protection from temperatures and heating rates ranging from orbital vacuum to atmospheric re-entry".
hypersonic atmosphere darpa mach space plane job thermal protection system heat experiment test project rocket mission fast
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