From: monte.davis@verizon.net   
      
   Dumb question: If one were in circular LEO and crazy enough to want a   
   90-degree change of inclination, what's the cost in delta-v? Is it, as   
   intuition is telling me, equivalent to throwing away all your ~9 kps   
   and re-acquiring it all?   
      
   I'm aware of the corrections for energy spent gaining altitude and   
   fighting drag on the initial launch, and whatever freebie you may have   
   gotten from the earth's rotation in a W-E launch. But is the   
   broad-brush picture "almost as hard as getting to orbit in the first   
   place"..? And for a still crazier 180-degree change, "twice as   
   hard"..?   
      
    (Assume a spherical Earth, homogeneous frictionless elephant, etc)   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)