From: damarkley@gmail.com   
      
   On Sunday, June 28, 2020 at 11:49:29 PM UTC-4, Doctor Who wrote:   
   > On 6/28/20 9:54 AM, JF Mezei wrote:   
   > > On 2020-06-27 18:19, dumpster4@hotmail.com wrote:   
   > >   
   > >> space cheap enough for the rest of us. While a conventional rocket engine   
   must   
   > >> carry giant tanks of fuel and oxidizer on its journey to space, an   
   air-breathing   
   > >> rocket motor pulls most of its oxidizer directly from the atmosphere.   
   > >   
   > >   
   > > *Most* of its oxydizer?   
   > > Until what altitude is there enough air to run a rocket engine?   
   > > How long out of the roughly 8 minutes for first stage engine firing does   
   > > it take to reach that altitude?   
   > >   
   > > Could such an engine be efficent when what it breathes in is 80%   
   > > nitrogen and 20% oxygen?   
   > >   
   > > Would such an engine have both a LOX turbopump as we know it, and a   
   > > separate one that pushes gaseous air into combustion chamber? (with the   
   > > LOX turbopump activated once a certain altiutude is reached.   
   > >   
   > > Is it theoretically possible to design the injectors and combustion   
   > > chamber to handle both gaseious pure oxygen at high pressure (after   
   > > pre-burner)  and gaseous  mix of nitrogen and oxygen (air) ?   
   > >   
   > >   
   > >   
   >   
   >   
   > there is no future for rocket motors, after PNN will be patented all   
   > rocket motors will look like toys.   
      
   There is also no future for trolls named after fictional scifi characters.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)