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Re: Stick Valves Etc.



I don't believe this is possible since the temperature
sensors, which all worked before the incident,
never showed us anywhere near a freeze condition.

Bob

----- Original Message ----- 
From: "Joe Leikhim" <jleikhim@nettally.com>
To: <amsat-bb@AMSAT.Org>
Sent: Tuesday, January 09, 2001 12:30 PM
Subject: [amsat-bb] Stick Valves Etc.


> I just read Dick Jansson's article regarding P3D thermal considerations
> in the October 1998 AMSAT proceedings. In that article he mentions that
> the N2O4 oxidizer freezes at ~-12C and that heating resistors were added
> to all of the tanks to compensate. Is it possible that the piping and
> valves are located such that their temperature is low enough for a
> freeze blockage? And therefore by orienting the satellite to raise
> temperature could free up a stuck valve.
> 
> On another thought, what are the potentials for a heat pipe leak, and
> how effective are the heatpipes expected to be during spin mode?
> 
> --
> Joe Leikhim K4SAT
> Jleikhim@nettally.com
> 
> "tv dinner by the pool,
> i'm so glad i finished school" -F.Zappa 1967
> 
> "The Revolution will NOT be televised" -Gil Scott Heron
> 
> "Whats he building in there?"- Tom Waits
> 
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