From: bondage@frontiernet.net   
      
   peter wrote:   
   >   
   > In looking at a ramjet/scramjet diagram, it seems that the burnt gas would   
   > want to go in both direction: towards both the inlet and the outlet. Since   
   > there is no valve to prevent a back flow, why wouldn't this push the air out   
   > of the inlet and stall the engine?   
      
      
      Forward motion is compresing (ramming) air into the inlets. This is,   
   after all, why these engines can't go from a standing start. At zero/low   
   velocity, you'd be right.   
      
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