From: andrewbetter@gmail.com   
      
   Thanks for the response.   
      
   I actually had realized the problem of the mass change due to propellant loss   
   earlier, so now my equation looks like this:   
      
   Delta-v = Burn Time * 1/2(acceleration at max load + acceleration empty)   
      
   The numbers still don't match up, though.  I could just be making some kind of   
   units or other calculation error.  Should this type of equation work?   
      
   As to what you are saying about gravitational drag: I did not think that   
   either equation would incorporate gravitational drag, as they should both   
   measure the rocket's absolute delta-v capability, not its capabilities with   
   respect to any planet in    
   particular.  Maybe I'm missing something important here, though, I'm not sure.   
      
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