From: smithm@SPAMBLOCKnetapps.com.au.retro.com   
      
   On Wed, 9 Feb 2005 07:46:49 +0000 (UTC)   
   Sander Vesik  wrote:   
      
   > Are there any known issues with running multiple HET   
   > (Hall Effect Thruster) in parallel to get increased   
   > performance? Is it being already used somewhere?   
      
   Just the energy cost, I think.   
      
   It would be interesting to work out how much of a spacecraft you would have   
   with a couple of submarine style fission reactors and as many ion or hall   
   thrusters as you had power for.   
      
   Given the lack of enthusiasm for this approach I can only assume that it   
   doesn't deliver transit times short enough to be safe for humans.   
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