Re: [amsat-bb] Magnetic Field Stabalization

[alf sauve <alf.sauve@xxxxxxxx>]

> letting it be random.

Random?  How about this hypothesis?  When a satellite is released it
acquires certain angular momentum's in each of it's three axis's (is there a
plural to axis?).  These momentum's, or tumbling, once established would
continue on in a very predictable, not random, pattern unless some external
force acted upon the satellite to alter these momentum's.  Re-stated,
wouldn't a body tumbling continue to tumble in the same way unless acted
upon by an external force?

If so then your fears of a momentary period of stabilization would be
unfounded.

However, from a perspective of trying to receive signals I would vote for
stabilization of the antennas so that the polarization remained fairly
constant during a pass.  Or at least changed slowly.

But of course, realize I'm just a poor accountant with no formal training in
space travel and I've never been higher than 45,000'.

Alf - W4ADS


================================
----- Original Message -----
From: "Bob Bruninga" <bruninga@nadn.navy.mil>
To: <amsat-bb@AMSAT.Org>
Sent: Wednesday, July 26, 2000 11:25 PM
Subject: [amsat-bb] Magnetic Field Stabalization


> Satellite Designers,
>
> I had wanted to add bar magnets to our satellite (a cube) to give us a
> predictable oreintation.   The alternative is nothing and just letting it
> be random.  I dont like this. since I fear it could stay in one
> orientation for long periods and overheat on one side.
>
> The proponent of this laisse faire approach says that if you wanted to
> keep it oriented one way, you couldnt, so he concludes that it will
> therefore always be moving.   But he cannot tell me how much.
>
> Where is the best report on the spin/tumble of the microsats and even
> better, how can I prove to this person that there is a risk of temporary
> stabilities that can overheat one side.  Or are my fears unfounded and
> random forces will assure even heating of a 10 inch symetric cube with
> only a few asymetric tape measure whips?
>
> de WB4APR, Bob
>
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