From: schillin@spock.usc.edu
Ed Ruf writes:
>On Thu, 20 Jan 2005 21:44:33 -0800, in sci.space.tech
>schillin@spock.usc.edu (John Schilling) wrote:
>>Perhaps, but I don't see how there would ever *be* any "craft that need to
>>cycle multiple times between supersonic and hypersonic operation during
>>a single flight".
>>What mission did you have in mind? And no, ultra-fast jet fighters
>>dogfighting all over a flight envelope that extends into the hypersonic,
>>aren't going to happen. The hypersonic missions the military is actually
>>interested in, only require accelerating once.
>Accelerating once,yes. But that doesn't then mean you don't need the "low
>speed" system to return home for Global Recon or Strike missions. DoD is
>definitely interested in this in all our talks with them.
Well, they're certainly going to be interested in getting their vehicle
back. But I rather suspect the best way to do that, is hypersonic. That
is after all what the vehicle is designed for, and the choice is between
the fuel economy of a hypersonic aircraft in its element or the fuel economy
of a hypersonic aircraft wallowing around in the subsonic. The efficiency
of the purpose-built subsonic cruiser was never on the table.
But either way, you still only get one acceleration to the hypersonic.
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