[eagle] Re: Eagle model
ku4os at cfl.rr.com
Sun May 6 17:57:13 PDT 2007
Just a reminder. So far we've only seen Ken's preliminary analysis that
covered a one year period. While that interval is good for LEO missions and
as a notional point to work from for GTO, that analysis needs to be expanded
to account for the procession of perigee over a much longer period so we
don't get an ugly surprise regarding eclipse lengths years into the mission.
On Sunday 06 May 2007 19:06:08 Robert McGwier wrote:
> Yesterday at Space Day at the Air and Space Museum (D.C.) , Bob Davis
> revealed the Eagle structure 1/2 scale model. I will put up pictures
> later to give everyone a look. It is a very nice look.
> I have neglected to post my remarks on Dick Jansson's module designs. I
> have had a regular module and a cut away of the heat sink module. This
> is very fine work. My final remarks on the work will await Bob Davis
> and Jim Sanford and I looking at this together. But at this time, I see
> no reason at this time for us not to accept these modules and to thank
> Dick for his fine work. Bob Davis has the modules now.
> Next, we are doing more detailed work on the energy requirements of the
> spacecraft. We have very short periods of eclipses and while the angled
> arrays do a great job of mitigating off pointing angle, NOTHING can
> mitigate no sun at all! Given the amount of energy storage required to
> live through these eclipses, it is my OPINION that we are going to have
> to compromise on the periods of eclipse and TURN SOMETHING OFF. The
> amount of solar panel and battery storage required to keep everything
> alive through these eclipses, upon more detailed study, seems
> exhorbitant in terms of cost, weight, etc. Lou, Bob Davis, and I have
> discussed this and Lou and Bob both have very nice study tools. We need
> to write up a report on this for everyone to take into account.
> Juan Rivera and company have made great progress on the Stephensen 70cm
> RX recently. They are really doing a fantastic job. More will follow
> from them but it is good news. We will be doing dynamics testing, noise
> testing, etc. soon!
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