From: gossg@gossg.org   
      
   MrAnderson  wrote:   
      
   >It's not reactionless then, I think, the photons reflect from the sail right?   
   >But I am not sure, better wait for more answers ;)   
      
   You would do better to just point the laser backwards as a photon   
   reaction drive, and skip the mirror step.  Niven's "Angel's Pencil"   
   used a laser drive.  I think that the Niven/Pournelle ships used laser   
   drives to move between portals in Mote.   
   --   
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