From: snidely.too@gmail.com   
      
   David Spain is guilty of  as of 1/26/2021   
   12:26:26 PM   
   > On 1/26/2021 3:05 PM, Snidely wrote:   
   >> David Spain submitted this gripping article, maybe on Tuesday:   
   >> SN8's pressurization system may have relied on gas from the generators   
   >> /beginning with propellants from the main tank/ (either charging during   
   >> ascent or using residualt).  I'm not sure how much detail was revealed   
   >> about this part.  SN9 will use helium (in COPDs, apparently) as an interim   
   >> fix; long term fix has not been revealed (and wasn't settled on at the time   
   >> of Elon's tweet about SN9+helium).   
   >   
   > Pressurization gas provided from the turbopump preburners was the original   
   > design.   
      
   Indeed.  But the initial source for the header tanks ... was it the   
   header tanks or gas generated from the main tanks?   
      
   > Helium is going to be a little hard to come by on Mars.   
      
   Maybe not, although the uranium deposits haven't been identified.  But   
   that consideration is why helium is only an interim fix.   
      
   /dps   
      
   --   
   I have always been glad we weren't killed that night.  I do not know   
   any particular reason, but I have always been glad.   
     _Roughing It_, Mark Twain   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)