On Wed, 31 Jul 2002 14:58:01 -0400 (EDT), Henry Spencer
<[EMAIL PROTECTED]> wrote:
>Any correlation between engine size and Isp is pretty weak. *Very* small
>engines do tend to suffer, because of cooling problems, boundary-layer
>issues, etc... but even that isn't an inviolable rule, just a tendency.
Small engines have issues with manufacturability and minimum gauge,
which affect T/W ratio - but I mean small. We haven't had those
problems with the 50 pound engines, and we could push minimum gauge a
lot harder on those without sacrificing manufacturability.
Kevin's 10 pound engines, now - those things are dinky. :-) T/W
probably won't be wonderful - you just can't make an engine too light,
or you'll drop it and damage it. (This isn't restricted to small
engines, BTW: the 750 has a ding in the nozzle annulus from being
dropped at a conference a few years ago. Kevin was *not* pleased.)
-R
--
"Sutton is the beginning of wisdom -
but only the beginning."
-- Jeff Greason
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