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Re: Leaking out the nozzle [was: Re:Bravo to the command team!]



----- Original Message -----
From: Margaret Leber (K3XS) <maggie@voicenet.com>
To: Ken Ernandes <n2wwd@mindspring.com>
Cc: Richard D. Burgan <wc8j@raex.com>; <amsat-bb@AMSAT.Org>
Sent: Tuesday, January 09, 2001 10:13 AM
Subject: [amsat-bb] Leaking out the nozzle [was: Re:Bravo to the command
team!]


> Ken Ernandes wrote:
>
> Wow...so the spin-up goes with the mass loss, the angular momentum of the
fuel
> is being transferred to the spacecraft on it's way to the engine, and the
> orbital anomalies are due to reaction thust provided by vaporizing the
leaked
> propellant in the engine. So with the magnetorquers providing some
attitude
> control, the thrust we can't turn off can at least be applied to advantage
> rather than disadvantage. Perhaps once the leaking propellant is
exhausted, the
> arc-jet can be used for further orbital goodness...although it will apply
thrust
> in essentially the opposite direction, so of course some "attitude
adjustment"
> will be required. :-)

Re-orientating the spacecraft 180 degress would reverse the current loss of
perigee altitude.


> The other good news is that the leak is apparently dumping overboard, with
the
> resulting thrust being applied along the spin axis--the propellant vapor
is
> unlikely to hang around and damage the spacecraft interior.
>
> Did anybody say which valve it was that was being exercized when the
telemetry
> stopped? I wonder if it is in the circuit for the propellant that is
leaking? Is
> it even known *which* propellant is leaking? Or if perhaps there was a
very
> brief pulse of hypergolic mixing of leaked propellants in the engine at
that
> time?
>
> Da goil's got nuttin' but questions. :-) But we do learn a little more at
a
> time.

Unfortunately, I don't have many more answers.

73, Ken N2WWD


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