[amsat-bb] Re: New Cubesat - the Ultimate Fox Hunt

10 Aug 2009

      Ok we have half the numbers,  This I also have gotten before a LOT,  but 
coming back down, is no place.  I want tosee these numbers.
Pete Rowe wrote:
...
Hi Joe
Check out this URL:
http://www.aerospaceweb.org/question/spacecraft/q0183.shtml
There is a table that shows the speed versus altitude for a shuttle launch. I think the key thing is that while it is in the thick part of the atmosphere ( I believe below 60k feet) the shuttle is going fairly slowly. It doesn't really get going until it is clear of the atmosphere.
I'm just guessing that on the return trip it is still going very fast when it gets to the thick atmosphere and hence, since there is nothing to slow it down except the atmosphere, it gets very hot.
Does this make sense?
73,
Pete
WA6WOA
--- On Sun, 8/9/09, Joe nss@mwt.net wrote:
From: Joe nss@mwt.net
Subject: [amsat-bb] Re: New Cubesat - the Ultimate Fox Hunt
To: G0MRF@aol.com
Cc: amsat-bb@amsat.org
Date: Sunday, August 9, 2009, 4:47 PM
Exactly David,
This was my reasoning for trying to get the data I asked for in a 
earlier message.
I have been asking this for Years and No one EVER has been able to give 
me this info.
if i was a conspiracy guy i'd be in the boat with the moon landing guys 
that orbital space travel doesn't happen.  Or at least manned never has 
happened,
But i'm not.  but i am frustrated that the speed vs altitude at take 
off  and re entry sseems to be totally un available.
because look at that
at take off we go from zero to 17580 Mph in what 10 minutes or so and 
are in orbit.
Yet the other way around gouing from 1780 to zero on 45 minutes  causes 
the fireball effect with the friction.
Why not on the way up?
Thats what i want to be able ro read on the way up when it's at 60K feet 
it's moving at what speed,  as wellas on the way down also,
and every other possible altitude,
I want to compare speeds at all altitudes.
we can go from zero to 17580 in ten min on the way up with no fireball,  
but take a slower,  450% slower return rate and it almost fries to a crisp.
Huh?
Joe WB9SBD
G0MRF@aol.com wrote:
...
Or, the not so 'cube'sat structure is an aerodynamic shape made from a cast 
ceramic material which glides in at a shallow angle allowing the energy to 
be  dissipated over a much longer period of time.
OK the solar cells burn off but an internal antenna would be OK as ceramics 
are fairly transparent to RF and a battery would provide the final hour or 
so of  tlm. 
Would love to see the temp readings as it comes down.
Would not love to be on the final end of the trajectory when it  arrives.
David   G0MRF

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