From: eripe.dk@gmail.com   
      
   On Tuesday, January 31, 2017 at 12:16:58 AM UTC+7, MrAnderson wrote:   
   > Hi, a little question, what if you make a partial vacuum inside gas bag,   
   like fill it with half of hydrogen that would fit normally, and keep the bag   
   as big as it was before.   
   > Would it be easier to achieve than vacuum airship?   
      
   Not really. If the pressure is smaller inside than outside, the envelope must   
   old the compression forces, and the normal 0,1 mm thick material cant do that   
   in any meaning full way. If you make the envelope from steel, it would let you   
   have a little less    
   gas inside, but its a bad tradeoff.   
      
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