[ExI] solar power satellites
hkhenson at rogers.com
Tue May 20 14:04:33 UTC 2008
At 08:28 PM 5/19/2008, you wrote:
> >Unfortunately, no. And the lift from LEO to GEO takes about 70% of
> >the mass in LEO to get it up to GEO.
>Any help from partially deploying your solar panels and using ion
>thrust to do the transfer to GEO?
The trouble with ion engines is that they generate so little thrust
that it takes more than a year to get to GEO. I suspect the bankers
are not going to like the delay. The other problem is that a power
sat is huge. Going up slow means it gets bashed by space
junk. Still, most of the work on power sats to date assumes
constructing them in LEO and doing exactly that.
>Also, a small prototype in LEO might be acceptable, and could provide
>intermittant power for disaster recovery, for example.
It's been discussed. The Japanese have been doing most of the
work. I don't think it is worth the trouble because LEO has problems
with ionized gas that you just don't get at GEO.
Most of the advocates talk about a 20 year program to build a one GW
test power sat. It's interesting as a research project but in terms
of solving the energy crisis it's useless. Just way too slow. We
need to be deploying these things at a very high rate in the next 5-7 years.
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