text: the lift coefficient is doubled and the induced 
  drag is four times 0.1 grsat. 
  load 
  factor is changed from one to five, the induced 
  drag is twenty-five times as great. 
  If all other 
  factors are held constant to single out this 
  effect, it could be stated that “induced drag 
  varies as the square of the lift” 
  
  If the flight 
  
  Di, 
  L! 
  Di,= L1 
  
  ’ 
  
  0 
  
  where 
  
  Di,= induced drag corresponding to 
  some original lift, L1 
  Di,= induced drag corresponding to 
  
  some new lift, Lp 