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It can be demonstrated that, for any airplane, there is a fixed ratio between the maximum range and maximum endurance speeds (1.31607...). Does another, fixed ratio exist between highest L/D and L/D at maximum endurance speed...?

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    $\begingroup$ "It's known that," from where? $\endgroup$ – CrossRoads May 15 '18 at 18:26
  • $\begingroup$ @CrossRoads Changed to 'it can be demonstrated...' aviation.stackexchange.com/a/36443/16042 $\endgroup$ – xxavier May 15 '18 at 20:31
  • $\begingroup$ Cool, I hadn't seen that formula before. Can find out some neat stuff just by asking where an assumption came from. $\endgroup$ – CrossRoads May 16 '18 at 2:26

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