XPost: rec.arts.sf.written, rec.arts.sf.science   
   From: jclarkeusenet@cox.net   
      
   In article , gossg@gossg.org says...   
   >   
   > David Johnston  wrote:   
   >   
   >   
   > >Driving much isn't necessary to be a "flying car".  Classic science   
   > >fiction flying cars only touch down to park because they ignore the   
   > >issue of how much power it takes to remain constantly hovering.   
   >   
   > Hovering is expensive.  But if you're going somewhere, so is flexing   
   > your tires continuously.  There's a reason why Greyhound is so   
   > expensive for long distances, and planes are ludicrously cheap.   
      
   Cheapest air fare I can find for Boston-LA is 135, Greyhound advanced   
   purchase for the same date is 139.  Not a lot of difference.  What's   
   truly ridiculous is the train, at 223.   
      
   > It's   
   > the same reason why swallows and butterflies can "afford' the energy   
   > to migrate.  Once you're up, it gets cheap to cover distances.   
      
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    * Origin: you cannot sedate... all the things you hate (1:229/2)