[ExI] How will air travel work in a green solar economy?

[Tomaz Kristan]

Over my small (Central European) country, there are about 10 large
passenger planes every moment. Their combined power is roughly equal to all
the hydroelectric, coal and nuclear power beneath them - combined.

I am not sure is this pathetic or glorious fact. I guess both.




On Wed, Jul 16, 2014 at 5:58 AM, Keith Henson <hkeithhenson at gmail.com>
wrote:

> On Tue, Jul 15, 2014 at 3:37 PM,   "Robert G Kennedy III, PE"
> <robot at ultimax.com> wrote:
>
> snip
> >
> > Yes, hundreds of Mt. Other than a first prototype article, we're not
> > thinking of boosting any of it off Earth. Too dang expensive. For a
> > project of this scale, it's off-world materials or nothing.
>
> I suggest that even the prototype might be built of asteroid materials.
>
> Though if sunshades come after power satellites, the transport cost
> can't be very high.
>
> > Now, I will concede that 2/3 of that mass in space is driven by the
> > power generation function we're piggybacking on the sunshade function.
>
> If you are mainly after energy, and building up space industry so it
> could build sunshades, it might be better to populate GEO with power
> satellites first.  If we eventually tap L1 for energy, the GEO power
> sats could be converted to relay stations.  If we were pouring energy
> captured at L1 into the earth system, sunshades might be required to
> keep the energy gain down.
>
> Keith
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