text: The effect of configura+~n has been noted pre- 
  viously in that the addition of parasite drag by 
  flaps, landing gear, speed brakes, external 
  stores, etc. will reduce the maximum lift-drag 
  In 
  ratio and cause a reduction of glide ratio. 
  the case where glide distance is of great im- 
  portance, the airplane must be maintained in 
  the clean configuration and flown at (L/D),=, 