SPS & Beamed Energy Propulsion

Has anyone actually done an analysis of Mike Combs
idea for a balloon supported mass driver? I really
like the idea, since it uses readily available
technology.

Gary 7

>
> On the subject of launching SPS's from Earth...
>
> Darel Preble of the Space Solar Power Workshop -
> http://www.sspi.gatech.edu/ - sent me some notes he
> had as responses to
> claims against SPS in Zubrin's "Entering Space".
> We've posted them here:
>
http://www.altenergyaction.org/mambo/index.php?option=com_content&task=view&id&&Itemid=2