From: joe@strout.net   
      
   In article <1106239185.922085.274950@c13g2000cwb.googlegroups.com>,   
    "daniel.m.v@terra.es"  wrote:   
      
   > I have been talking with people and we think that following this basic   
   > principle, propellantless propulsion systems can be built because   
   > angular motion quantity can be transformed in a component of linear   
   > motion quantity and in another component of angular motion quantity. If   
   > we isolate the linear motion component whe can build a propulsion   
   > device.   
      
   No, that's not possible.  Linear and angular momentum are conserved   
   separately.  The only way you can make something like this work is by   
   transferring some of the momentum to some other object -- for example,   
   to the Earth, by braking it with something connected to the ground.   
      
   But for a free-floating object, with nothing to transfer its momentum   
   to, then you'll have no way to change its angular momentum at all;   
   forget about trying to convert some of it to linear momentum!   
      
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