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

[Peter Guelzow <peter.guelzow@xxxxxxxxxxxx>]

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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