From: nuny@bid.nes   
      
   On Sunday, January 22, 2017 at 8:19:50 PM UTC-8, eripe wrote:   
   > >    
   > >   The reflector would only have to be perfect at one wavelength.    
   >    
   > Tangent question. If its only perfect at one wavelength, how fast could it go   
   > before the redshift would make it melt.   
   >    
   > Also the crew would not see the redshift, would it still melt?   
      
     Doesn't matter; the speed of light is absolute, so the advancing trailing   
   surface and retreating leading surface (advancing and retreating from the   
   point of view of the contained light) is what makes the difference. It won't   
   be about speed so much as    
   acceleration- at any constant velocity the coating will have the right   
   reflectivity.   
      
     Very probably the coating can't be perfectly reflective at exactly one   
   wavelength but will have a narrow Bell-type curve, so there will be a   
   rate-of-change effect. In other words there'd be an acceleration limit before   
   it starts to burn through, as was    
   wanted in the EMdrive thread.   
      
      
     Mark L. Fergerson   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)