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+--- Thread: Mach 5.1 (/showthread.php?tid=152136)
Mach 5.1 - Mac1337 - 05-04-2013
http://gizmodo.com/watch-boeings-x-51a-waverider-scramjet-blast-off-to-ma-490575939
NASA's X-43, also a scramjet drone, tops out at 7,000 mph.
Re: Mach 5.1 - Will Collier - 05-04-2013
Nice accomplishment. The hypersonic regime is very tricky, particularly for controlled flight with an air-breathing engine. The gas constant becomes variable, O^2 breaks up into single-atom atomic oxygen... lots of weird stuff.
Re: Mach 5.1 - cbelt3 - 05-05-2013
Woo hoo !!!!!
Re: Mach 5.1 - space-time - 05-06-2013
Will Collier wrote:
Nice accomplishment. The hypersonic regime is very tricky, particularly for controlled flight with an air-breathing engine. The gas constant becomes variable, O^2 breaks up into single-atom atomic oxygen... lots of weird stuff.
you mean this gas constant?
Re: Mach 5.1 - Will Collier - 05-06-2013
space-time wrote:
[quote=Will Collier]
Nice accomplishment. The hypersonic regime is very tricky, particularly for controlled flight with an air-breathing engine. The gas constant becomes variable, O^2 breaks up into single-atom atomic oxygen... lots of weird stuff.
you mean this gas constant?
Nope, the adiabatic gas constant (gamma). For up to about Mach 4, it's a constant at 1.4. Get towards Mach 5 and above and it becomes variable.
And then there are the entropy changes across the shock wave and nasty viscous flow effects, and...