From: LFLekx@NOSPAM.rogers.com.retro.com   
      
   On Wed, 8 Dec 2004 08:20:17 +0000, Michael Smith   
    wrote:   
      
   >The disadvantages are many:   
   >1. The launch vehicle has to go very fast close to the ground where the air   
   is thick. This causes drag and energy loss.   
      
      Not to mention, *extreme* structural heating...   
      
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