On Fri, 03 Oct 2003 02:31:57 -0500, John Carmack
<[EMAIL PROTECTED]> wrote:
>60 second burn times with an unguided rocket is not going to work, you will
>have really significant gravity turn effects that greatly increase your
>landing zones and reduce your altitude. Unguided sounding rockets are spin
>stabilized, scaling HPR up to those levels alone won't work unless you are
>just really really lucky.
I'm missing something. What does burn time have to do with
dispersion? Unless most of the dispersion is caused by the engine,
you'll have the same gravity turn regardless of whether more or less
of it is powered; the energy is the same. In fact, energy of a short
burn vehicle is more than that of a long burn; it burns out lower and
has to coast higher.
-R
--
"SEAL training is just like Ranger training, except
it's three weeks longer. It takes that long to teach
them how to balance the balls on their noses."
-- Doug Jones
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