XPost: sci.space.shuttle, sci.space.policy   
   From: dietz@dls.net   
      
   Richard Schumacher wrote:   
      
   > The engine geometry until recently didn't work, but at least it was clear   
   that hydrogen can sustain a   
   > sufficiently rapid flame front.  Hydrocarbons don't, which eventually will   
   drive the fanatics toward that   
   > other old money-sink day-dream, pulse-detonation engines.   
      
   Or toward on-board reforming of the hydrocarbons into things like CO, H2, and   
   acetylene.   
      
   	Paul   
      
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