From: daellis94@gmail.com   
      
   No, no, I understand where properties come from.  What I'm saying is that you   
   aren't alluding to any specific, known limits that make such torch drives, as   
   a rule, physically impossible and not simply difficult to engineer.  One cant   
   demonstrate that an    
   idea is truly ruled out by the laws of physics until one can actually make a   
   theoretical calculation to that end.     
      
   "Torch drives" are not a specific group of engines, and thus offer no real   
   information about parameters to consider.  Without being able to compare some   
   parameters to the properties of a system being designed, there is no   
   determining, truly, whether or    
   not that system can or cannot function.     
      
   In short, it's a moot point.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)