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RE: Why The Drift?



Thanks Robert and James
Very interesting
Regards/73
Ray Webber (ZS6RSW)

> -----Original Message-----
> From: owner-SAREX@AMSAT.Org [mailto:owner-SAREX@AMSAT.Org]On Behalf Of
> Robert Oler
> Sent: 24 February 2001 11:11
> To: kf5wt@verizon.net
> Cc: sarex@AMSAT.Org
> Subject: Re: [sarex] Why The Drift?
> 
> 
> 
> 
> 
> >From: "James Alderman, KF5WT" <res06u61@gte.net>
> >Reply-To: "James Alderman, KF5WT" <kf5wt@verizon.net>
> >To: <sarex@AMSAT.Org>
> >Subject: [sarex] Why The Drift?
> >Date: Sat, 24 Feb 2001 00:33:27 -0600
> >
> >Perhaps some knowledgeable person could educate me on 
> something.  When 
> >the>down to the minute.
> >
> >Do I just have gremlins in my computer, or is there 
> something to my theory?
> >Your comments and physics lessons would be appreciated.
> >
> >73, James Alderman, KF5WT
> >Dallas, Texas, USA
> >
> >----
> 
> Howdy James.
> 
> Just as Mir is falling because of autmospheric drag so does 
> the station 
> (even more so with the new solar arrays) and if this were not 
> countered the 
> station would like Mir simply reenter.
> 
> While the shuttle was "docked" to the station complex it did 
> several orbit 
> "raising" manuevers for the station and that changed the orbit of the 
> station by the amount you noted.  There are currently three 
> "vehicles" that 
> can raise the orbit of the station complex...the shuttle, the Russian 
> progress space delivery system and the Service Module attached to the 
> station itself. The order of preference to do the orbit 
> raising is currently 
> the shuttle, then Progress, then the Service module.
> 
> The shuttle is not very efficient in doing this because of 
> the off axis 
> thrust that it has based on where it is docked...but right 
> now the Progress 
> resupply vehicles are in short supply AND they are trying to 
> preserve teh 
> Russian service module fuel to allow the Russians to 
> "contribute" less.  So 
> they actually changed some of the shuttle post dock manuevers 
> to allow it 
> the fuel to give several orbit raising manuevers.
> 
> Shuttles will likely do this on every "visit".
> 
> Yours is a good question.  The only bad question is the one unasked.
> 
> Robert Oler WB5MZO
> _________________________________________________________________
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