On Sat, 15 Feb 2003, Ian Woollard wrote:
> >Note a fine point: you can use separate landing engines...
>
> But I would put it the other way, why would you not run them on the way
> up? It's extra thrust...
There are a number of reasons why you might not, starting with the fact
that they probably have lower Isp. However, if there is no specific
reason why it's impossible, it is certainly worth considering.
> ...but I suspect I would rather throttle,
> then shutdown, the big engines to help with g limiting, and leave the
> landing engines running.
That's probably a bad bargain, because that means the last of your ascent
fuel -- the part that you get the most benefit out of -- is being burned
inefficiently in low-Isp engines. Shutting down some of the big ones is
probably preferable.
Henry Spencer
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