From: henry@spsystems.net   
      
   In article <408DB76C.26A37C26@frontiernet.net>,   
   Joann Evans   wrote:   
   >   Well...all the problems you have with altitude compensation on Earth,   
   >are even greater there. Drag, too, I'd suspect. On the other hand, the   
   >dense air would allow rather small wings for a given lift, at lower   
   >altitudes.   
      
   Ditto rather small balloons.  The obvious way to do an ascent from Venus   
   is to start with a balloon ascent into thinner air.   
      
   >> Might things like ejector ramjets be very efficient?   
   >   
   >   Where's the oxygen to burn fuel? 'Air breathing' engines do make that   
   >assumption, but it's not true on all worlds.   
      
   There are fuels which will burn in CO2.   
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   MOST launched 30 June; science observations running     |   Henry Spencer   
   since Oct; first surprises seen; papers pending.        | henry@spsystems.net   
      
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