text: PER- 
  In order to obtain the mini- 
  FORMANCE. 
  mum glide angle through the air, the airplane 
  must be operated at (L/D)mor. The subsonic 
  (LIDL 
  occur at a specific value of lift coefficient and 
  angle of attack. However, as can be noted 
  from the curves of figure 6.6, small deviations 
  from the optimum C, will not cause a drastic 
  In fact, a 
  reduction of (L/D) and glide ratio. 
  5 percent deviation in speed from the best glide 
  
  FACTORS AFFECTING GLIDE 
  
  of a given airplane configuration will 