Re: Congratulations NASA

On Tue, 18 Jul 2006 21:31:43 -0000, cmadams@xxxxxxxxxx (Chris Adams)
wrote:

Once upon a time, Josh Hill <joshuaphill@xxxxxxxxx> said:
Last time I checked (which was some time ago) they were thinking of
using the J2 on one and the SSME's on the other, but I guess my info
is out of date.

http://www.space.com/news/060630_ares_rockets.html
http://www.spacedaily.com/reports/NASA_Aims_For_Mars_With_Ares_Launch_Vehicle_999.html

Thanks

Found an interesting thread which explains why they switched from the
SSME to the J2X on the Ares 1:

'NASA *is* following the ESAS plan. The study seriously considered the
five-segment RSRB with J2S option, which was actually predicted to be
cheaper than the four-segment with SSME design (both were less costly
on a per-flight basis, and provided less loss-of-crew risk, than Delta
IV). The two designs were nearly tied, but four-segment won out due to
the desire to get CLV flying as fast as possible. When detailed
engineering work began post-ESAS, the five-segment option was
reconsidered.'

http://uplink.space.com/showflat.php?Cat=&Board=missions&Number=524594&page=0&view=collapsed&sb=5&o=0&fpart=3&vc=1

I see too that they've dropped the methane engine -- that one's a
mystery to me, given its importance to a Mars mission . . .

--
Josh

"I love it when I'm around the country club, and I hear people talking about the debilitating
effects of a welfare society. At the same time, they leave their kids a lifetime and beyond
of food stamps. Instead of having a welfare officer, they have a trust officer. And instead
of food stamps, they have stocks and bonds."

- Warren Buffett

.

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