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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p><br>On Dec 22, 2015 19:22, "Dan TheBookMan" <<a href="mailto:danust2012@gmail.com">danust2012@gmail.com</a>> wrote:<br>><br>><span style='color:#1F497D'>>…</span> I'm guessing, without have done any research, this first one will be dissected and analyzed to see what the wear and on it is like. Am I wrong about that?<o:p></o:p></p><p><span style='color:#1F497D'>>…</span>I am sure you are right about that. Still experimental, though I suspect a fast tempo<span style='color:#1F497D'>… Steve<o:p></o:p></span></p><p><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>We can build re-startable rocket motors if we accept the weight penalty. We already do that for some applications. The one-use throwaways sacrifice everything to get weight down. <o:p></o:p></span></p><p><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>It is completely believable to me that Musk’s group has developed a gas-and-go rocket motor. Good chance he needs to run it fuel-rich to keep nozzle temperatures down out of the high-erosion regime, so there are known performance compromises to that approach. But after all these years, I am convinced the lower performance reusable rockets are the way forward. I don’t know what SpaceX has in mind for recovering a second stage, but this tail-landing first stage is the most exciting development in space tech in a long time.<o:p></o:p></span></p><p><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>spike<o:p></o:p></span></p><p><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p></div></body></html>