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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext'>>…</span></b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:windowtext'> <b>On Behalf Of </b>Dan TheBookMan<br><b>Subject:</b> Re: [ExI] space-x sticks the landing<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>On Dec 22, 2015, at 7:47 AM, spike <<a href="mailto:spike66@att.net">spike66@att.net</a>> wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><pre><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>>>… It makes sense to do it that way, so if the thrusters or anything else fails during the landing sequence, the bird overshoots the landing site and drops into the sea rather than some litigious prole’s back yard. </span><o:p></o:p></pre></div></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal><span style='color:#1F497D'>>…</span>Wouldn't there be some fuel savings by having it land east of the launch side?<span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Ja, it is a compromise. But I like the notion of launching and landing at the same site, as SpaceX does. This has some big advantages, with savings in processing and recovery. Their launch profile is almost straight vertical. Then once above the thick air, the next stage turns east, the first stage comes almost straight back down. That profile is less efficient but has compelling compensating advantages. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>It could be we have been in a paradigm trap for a long time. We maximize payload capacity at the expense of cost per pound to orbit.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><o:p> </o:p></p><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><pre><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>>>…As for deceleration, the atmosphere does most of the work for us. For the very first time in launcher history, air is our friend.</span><o:p></o:p></pre></div></blockquote><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>True!<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><p class=MsoNormal>Regards,<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><p class=MsoNormal>Dan<o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>SpaceX’s success has my wheels turning. I can imagine various re-entry strategies where you would sacrifice the front end of the first stage for the deceleration phase, then turn sideways once you get below about Mach2, then turn nozzle first when the speed reduces to where it can survive the aero-load. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>In order to gain the support of senators and representatives, NASA had to do the space program in a grossly inefficient way by intentionally spreading the work over many states. SpaceX can locate its factories, its first stage recovery team and everything it needs right down there on Cape Canaveral. It can house its workers in Titusville, which has become a really low-cost place to live, now that the shuttle program has ended. It has so much going for it. This is so cool!<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>spike<o:p></o:p></span></p></div></div></div></div></div></body></html>