[ExI] Getting into space cheaply

[Adrian Tymes]

How do you get the energy to the rocket on the far side of the planet from
the beam source?  Or would this require multiple beam emitters, spread
around the planet?

On Sat, Nov 26, 2011 at 7:44 AM, Keith Henson <hkeithhenson at gmail.com> wrote:
> I think I have a conceptual method to reduce the cost of going into
> space well below the $100/kg level.
>
> It involves using beamed energy heated hydrogen that is combined with
> ram air as long as there is air to scoop up.  The average eqivalent
> exhaust velocity all the way to LEO is around 20 km/s, even better
> than Skylon at 10.5 km/s to when it runs out of air.
>
> If you are interested in a short writeup and the spreadsheet, let me know.
>
> Keith
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