In reply to David Roberson's message of Sat, 17 Jan 2015 20:36:24 -0500: Hi, [snip] >I believe that the air thins out much too quickly with altitude. The first >stage would only be useful up to mount everest's elevation.
..but maybe that's enough, if the second & third stages are bigger, which they can afford to be as a consequence of the weight saving in the first stage. Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/project.html
