Re: Reasonable Space Vehicle
From: G. R. L. Cowan (gcowan_at_eagle.ca)
Date: 09/04/04
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To: sci-space-tech@moderators.isc.org Date: Sat, 04 Sep 2004 18:26:48 -0400
Allen Meece included:
>
> <<The first stage is a LOX/RP1 powered 'big cheap booster' -
> not necessarily pressure fed - that flies straight up, releases the
> second stage, and flies straight down to land at the launch site.>>
> Something like >80% of the system's total fuel is spent to obtain the
> horizontal component of orbital flight.
> Thus, the booster would get a few hundred miles down-range ...
In other words, the OP did not understand his question.
I also think straight up and straight down,
for a first stage with a throttleable motor,
are interesting. That is to say,
the booster is controlled to stay at or very near *zero*
miles downrange throughout its flight.
All it does is put the upper stages up where the air is,
in expansion-nozzle terms, close enough to gone.
They do all the horizontal component.
--- Graham Cowan
http://www.eagle.ca/~gcowan/Paper_for_11th_CHC.doc --
"Boron: A Better Energy Carrier than Hydrogen?"
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