From: snidely.too@gmail.com   
      
   Lo, on the 11/12/2022, JF Mezei did proclaim ...   
      
   > And generic question: say payload bay has plenty of fuel: coming back to   
   > Earth, would retrograde firing of OMS to put Shuttle into speed its   
   > tiles could support end up costing roughly the same amount of fuel as   
   > the TLI to get to moon? much less? more ?   
      
   First cut:  the speed the shuttle's tile could support is orbital speed   
   (17K etc).  The TLI converts chemical energy into to kinetic energy   
   which is then converted to potential energy by the path to the moon.   
   Returning from the moon (free return, frex) converts that potential to   
   kinetic energy; to return to orbital speed, you need the same delta-v   
   as the TLI.   
      
   /dps   
      
   --   
   You could try being nicer and politer   
   > instead, and see how that works out.   
        -- Katy Jennison   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)