From: alain245@videotron.ca   
      
   On Oct/16/2021 at 04:12, JF Mezei wrote :   
   > On 2021-10-15 20:23, Snidely wrote:   
   >   
   >> And bigger wings mean more drag, which means more heating.  Does drag   
   >> got up as V-squared?  Is the Concorde made out of vanadium?   
   >   
   >   
   > My question pertains exactly to this.   
   >   
   > If plane supports the heat at Mach 2 at 60,000feet,  would it sustain   
   > the same heat if it climbed to say 80,000 and accelerated so that wings   
   > would produce equal amount of lift as it did at Mach 2 at 60,000 ?   
   >   
   > If the wings generate the same amount of lift, wouldn't that mean equal   
   > amount of drag and thus heating?   
   >   
   > Again, I am not asking about accelerating the Concorde to a gazillion   
   > kmh or mach 10. Wondering if you exclude engine limitations, you could   
   > make it climb much higher and go at higher speed to match the   
   > lift/drag/heating it got at Mach 2 at 60,000.   
      
   An interesting side note about this is that if you keep going faster and   
   higher in order have the same lift, you should reach approximately   
   orbital speed at 100 km. So at that point you are no longer flying but   
   orbiting. That is the reasoning behind the definition of the Karman   
   line. You can't fly above 100 km because to fly there, you need to reach   
   orbital speed and therefore you are orbiting not flying. And you can't   
   orbit below the Karman line because at orbital speed below the Karman   
   line you have enough lift to fly which means you will also have enough   
   drag that you won't orbit.   
      
      
   Alain Fournier   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)