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Re: Bravo to the command team!



Richard:

We had excellent determination of the orbit
from radar painting by NORAD.  Since then,
according to bulletins, we have continued to
have mass loss (thrust from some source).

If we have had more radar paintings by NORAD,
and more observations by ground stations
applied to the solution of the new orbit, then
we can easily model to the cumulative delta
V being applied.  This delta V can only come
from mass loss, drag, etc. with most of it coming
now from mass loss (leak).

Bob

----- Original Message -----
From: "Richard W L Limebear" <Richard@g3rwl.demon.co.uk>
To: <n2wwd@mindspring.com>; <amsat-bb@AMSAT.Org>
Sent: Wednesday, January 10, 2001 1:32 PM
Subject: Re: [amsat-bb] Bravo to the command team!


> Ken
>
> > > > Furthermore, finding a good fit for the thrust gives an
> > > > excellent estimate of the rate at which the propellant mass is being
> > lost.
> > >
> > > So how much longer will it continue (till depletion) ?
> >
> > Good question.  The answer depends, of course, on the reason for the
leak.
> > This one is best left to the Command Stations to answer.
>
> I misunderstood the original statement to mean that the "good fit" had
been
> found.
>
> > > OTOH (assuming its only one of the two fuel components) once its all
gone
> > > then we can "fire" the motor to get rid of the other component. Then
the
> > > arcjet will have a better effect (if it works) with less mass to shove
> > around.
> >
> > Perhaps, but we'll never get much Isp with only one component of the
> > bi-propellant.
>
> I wasn't expecting that (but every little helps as long as its pointed in
> the right direction)
>
> BUT ... getting rid of this surplus fuel means that the arcjet will be
able
> to accelerate (useful stuff) *more* than (useful stuff)+(useless stuff).
>
> 73
> Richard W L Limebear G3RWL
> g3rwl@amsat.org
> FOC # 1188
>
>           So many beautiful girls ..... (sob) so little time
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