NEAmines : Message: Re: [NEAmines] Metrication

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From eos.mars.program@... Wed Jul 01 02:04:01 2009
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From: EOS Mars Program <eos.mars.program@...>
Subject: Re: [NEAmines] Metrication
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Some interesting background context to the metrication issues:

http://www.space.com/news/metric_policy_100199.html

http://edition.cnn.com/TECH/space/9909/30/mars.metric/

http://oig.nasa.gov/old/inspections_assessments/g-00-021.pdf

http://science.nasa.gov/headlines/y2007/08jan_metricMoon.html

http://www.metrication.us/content/nasa-criticised-sticking-imperial-
units

Jan

On 1 Jul 2009, at 07:02, james brown wrote:

> NASA has a much better record on hitting Mars than anyone else.
> That misstake has only once happened. That is not their problem. I
> think they should make the change, but that is an different issue.
>
>
> Earth water and almost anthing else to LEO will get much cheaper.
> Starting with SpaceX, but then even much better when we have
> implemented the tether upper stage. After talking to Elon Musk it
> looks like he expcet that to be in a few nundred dollars per pound.
> The tether should lower to ten percent that. Since the cost of
> asteroid water even then will depent on cost to LEO it will still
> be a good money maker at fifty dollars a pound or less.
>
> Jim Brown

Wed Jul 1, 2009 9:03 am

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EOS Mars Program <eos.mars.program@...>

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Expand Messages	Author	Sort by Date
A thought about how one could use the temperature differential between sunside and nightside on a spacecraft. If an external sunside heat collector contained a...	EOS Mars Program bty580492	Jun 29, 2009 1:29 pm
Yes that is one of the advantages of a solar thermal also called "solar dynamic" system, but you really need a concentrating mirror or lens to bring the...	james brown jim4mars	Jun 29, 2009 3:09 pm
Jan, as far as I understand you've just reinvented the "solar dynamic" electricity source. Ueli ... From: EOS Mars Program <eos.mars.program@...> ...	Ueli Scheuermeier uscheuermeier	Jun 29, 2009 3:38 pm
Ueli, Jim, That's OK then! Was just looking for a suitable backup system. By the way, I am uncovering more and more electrothermal-powered missions, the latest...	EOS Mars Program bty580492	Jun 29, 2009 8:05 pm
Most ion drives do not spend much power on heating, Just enough to ionize it, but mostly it uses extrema charges to accelerate the gas. The MET uses...	james brown jim4mars	Jun 30, 2009 10:30 am
My apologies, Jim, you are absolutely correct! No excuses for the dismal conversion. This is why NASA probes keep hitting what they shouldn't, by not ...	EOS Mars Program bty580492	Jun 30, 2009 1:37 pm
NASA has a much better record on hitting Mars than anyone else. That misstake has only once happened. That is not their problem. I think they should make the...	james brown jim4mars	Jul 1, 2009 6:02 am
Some interesting background context to the metrication issues: http://www.space.com/news/metric_policy_100199.html ...	EOS Mars Program bty580492	Jul 1, 2009 9:04 am
Yes, as far as I figure, we need to differentiate electric drives (such as ion engines) from electrothermal drives, such as METs. Big difference, I believe. ...	Ueli Scheuermeier uscheuermeier	Jul 1, 2009 6:19 am
I think I hinted at that. I wonder who has been using the term electro thermal for ion drives. Jim Brown ________________________________ From: Ueli...	james brown jim4mars	Jul 1, 2009 6:37 am
Ueli, Yes, I am clear on this one, and I think we need to label them differently. The point I was making on the stats, is how efficient these electric drive...	EOS Mars Program bty580492	Jul 1, 2009 11:57 am
Sorry I thought you said the concentrating systems would not work well enough. On the micro gravity of an asteroid such heating systems make even more sense. ...	james brown jim4mars	Jul 6, 2009 8:26 am

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