XPost: rec.arts.sf.written, sci.space.policy, sci.physics   
   From: jfindley@cinci.nospam.rr.com   
      
   In article ,   
   rgregoryclark@gmSPAMBLOCKail.com says...   
   > The reason why it?s so high for the TSTO is that the first stage has to do a   
   > boost back maneuver to return to the launch site. But for the SSTO you just   
   > let the Earth rotate beneath you until you are over the landing site then   
   > land vertically.   
   >   
      
   Don't forget Falcon 9 first stages also do a reentry burn to reduce the   
   velocity before hitting the atmosphere.  On a reusable SSTO version of   
   the same, you'll either need to reserve a *hell of a lot* of propellant   
   for that burn or you'll really need to beef up the TPS.   
      
   Jeff   
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