From: snidely.too@gmail.com   
      
   David Spain pounded on thar keyboard to tell us   
      
   > Several design changes in the works for SN11.   
      
   SN11?  Probably not any major change.  SN15 is supposed to be the 1.1   
   release.   
      
   > I suspect a total re-think of   
   > the helium pressurization setup for the header tanks. Perhaps some new form   
   > of autogenous pressurization, along the lines of a cascade dual   
   > pressurization scheme, whereby the header tanks are placed under higher   
   > pressure than before from the engines and then that is used to prevent ullage   
   > slosh, while the engines are off during the belly flop. Not sure why Elon   
   > went the helium route in the first place on SN9/SN10. It's going to be more   
   > complex in some ways than the helium scheme but hopefully and somewhat   
   > un-intuitively more reliable.   
      
   It was a quick fix to the low header pressure problem of SN8, of   
   course.  And it wasn't so supposed to be the permanent fix, so SN15   
   could be a *revised* autogenous pressurization scheme; after all,   
   they've had 3 months to do fresh engineering.   
      
   /dps   
      
   --   
   "This is all very fine, but let us not be carried away be excitement,   
   but ask calmly, how does this person feel about in in his cooler   
   moments next day, with six or seven thousand feet of snow and stuff on   
   top of him?"   
     _Roughing It_, Mark Twain.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)