Re: [amsat-bb] AO-40: Momentum Wheels tested!!!

["Bernie Basel" <k3baz@xxxxxxxx>]

Ok... Either I missed making my point or I missed the point, Hi.

I understand that the current mass of the s/c can be calculated, that was
not what I was questioning.   My question was how do we determine how much
fuel is left if we do not what the s/c mass is sans fuel.  In other words if
pieces of the s/c are missing because of the post launch incident the mass
is an unknown.  You can't subtract the an unknown value from the total mass
to calculate the amount of fuel left.


73's,
Bernie, K3BAZ



----- Original Message -----
From: "Peter Guelzow" <peter.guelzow@arcormail.de>
To: "Bernie Basel" <bbasel@yahoo.com>
Cc: <amsat-bb@AMSAT.Org>
Sent: Wednesday, August 15, 2001 5:09 PM
Subject: Re: [amsat-bb] AO-40: Momentum Wheels tested!!!


> Bernie,
>
> you have the answer already below...
>
> We know the mass and thus the Moment of Inertia (MOI)
> of the wheels..  from the change in spin rate we
> can determine the s/c mass...
>
> 73s Peter
>
>
> Bernie Basel wrote:
> >
> > I was under the impression that the mass of the s/c
> > was an unknown due to the post launch mishap.  If we
> > do not know the mass of the s/c how do we calculate
> > the amount of fuel left?
> >
> > Bernie, K3BAZ
> >
> > --- Peter Guelzow <peter.guelzow@arcormail.de> wrote:
> > > In fact, since the wheel MOIs are exactly known,
> > > this means that we would be able to determine s/c
> > > MOI to about 5% - from this we could possibly infer
> > > how much fuel is left in the N2O4/MMH tanks.
> >
> ----
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