From: jimdavis2@earthlink.net   
      
    wrote:   
      
   > An added stage would increase the total burn time.   
   > The burn time to any particular orbit doesn't vary   
   > by much, so if they add a stage it must mean they're   
   > going higher.  So a heavy lifter which was a big   
   > first stage lifting a Falcon V would be for putting   
   > large loads into geosync or earth escape.   
   >   
   > It would not be for lifting heavy loads to low   
   > earth orbit -- i.e. supplying the ISS.   
      
   Not necessarily. If you only used the first stage of the Falcon V   
   as the second stage of the new heavy lifter you would have a   
   vehicle suitable for large payloads to LEO.   
      
   Jim Davis   
      
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