text: NAVWEPS 00-8OT-80 
  BASIC AERODYNAMICS 
  
  EFFECT OF HIGH LIET DEVICES. The 
  lift devices (flaps, 
  primary purpose of high 
  slots, slats, etc.) is to increase the CLn, of the 
  airplane and reduce the stall speed. The take- 
  off and landing speeds are consequently re- 
  duced. The effect of a typical high lift device 
  is shown by the airplane lift curves of figure 
  1.15 and is summarized here: 