From: jeff.findley@ugs.nojunk.com   
      
   "Tom Clarke"  wrote in message   
   news:1110826921.871299.29130@z14g2000cwz.googlegroups.com...   
   >   
   > Andrew Higgins wrote:   
   > > >   
   > > > The water jet can emerge from a tiny 1mm nozzle at speeds of   
   > > > 3,000 feet per second...   
   > > >   
   >   
   > > 3,000 fps = 900 m/s, or Isp = 93 seconds (lousy, not much better than   
   > > cold nitrogen thruster).   
   >   
   > Could the "water" jet be used to push a comet into earth orbit?   
   >   
   > Lots of water (or other liquid) on a comet, so the low energy   
   > requirements might outweigh the low Isp.   
      
   You'd likely do better by super heating the water (into steam) and letting   
   it expand in a rocket engine nozzle than by using one of these water jets.   
      
   Jeff   
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