NEAmines at Yahoo! Groups

Hydrogen Battery Systems

EOS Mars Program — Tue, 07 Jul 2009 19:46:13 GMT

Ueli, looks like I have been upstaged again, all the elements of the fuel cell/hydrogen battery produced by a British company:

Re: Heat Differentials and more

james brown — Mon, 06 Jul 2009 08:26:00 GMT

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.

Re: Heat Differentials and more

EOS Mars Program — Wed, 01 Jul 2009 11:57:16 GMT

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

Re: Metrication

EOS Mars Program — Wed, 01 Jul 2009 09:04:01 GMT

Some interesting background context to the metrication issues: http://www.space.com/news/metric_policy_100199.html

Re: Heat Differentials and more

james brown — Wed, 01 Jul 2009 06:37:43 GMT

I think I hinted at that. I wonder who has been using the term electro thermal for ion drives. Jim Brown ________________________________ From: Ueli

Re: Heat Differentials and more

Ueli Scheuermeier — Wed, 01 Jul 2009 06:19:55 GMT

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.

Re: Heat Differentials and more

james brown — Wed, 01 Jul 2009 06:02:24 GMT

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

Re: Heat Differentials and more

EOS Mars Program — Tue, 30 Jun 2009 13:37:47 GMT

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

Re: Heat Differentials and more

james brown — Tue, 30 Jun 2009 10:30:04 GMT

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

Re: Heat Differentials and more

EOS Mars Program — Mon, 29 Jun 2009 20:05:04 GMT

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

Re: Heat Differentials

Ueli Scheuermeier — Mon, 29 Jun 2009 15:38:14 GMT

Jan, as far as I understand you've just reinvented the "solar dynamic" electricity source. Ueli ... From: EOS Mars Program

Re: Heat Differentials

james brown — Mon, 29 Jun 2009 15:09:33 GMT

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

Heat Differentials

EOS Mars Program — Mon, 29 Jun 2009 13:29:22 GMT

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

Re: Which objects?

james brown — Sun, 28 Jun 2009 22:10:27 GMT

We need NEAs of c, carbonaceous condrite, or cometary material in an amor or Apollo orbit. We should find Those that will be making a reasonable approach

Re: I want to hear from you // ele//proton exchange membranes - fu

james brown — Sat, 27 Jun 2009 13:36:59 GMT

Yes we can not supper heat the nuclear. What I am suggesting we use a nuclear system to get the reaction mass as hot as we can with that system. Then get more