text: Percent reduction in stall speed 1 5 18 29 50 
  
  The contribution of the high lift devices must 
  be considerable to cause large reduction 
  in 
  stall speed. The most elaborate combination 
  of flaps, slots, slats, and boundary layer con- 
  trol throughout 
  the span of the wing would 
  be required to increase C,- by 300 percent. 
  A common case is that of a typical propeller 
  driven transport which experiences a 70 per- 
  cent increase in CzIM1 by full 
  flap deflection. 
  A typical single engine jet fighter with a thin 
  swept wing obtains a 20 percent increase in 
  CL- by full 
  flap deflection. Thin airfoil sec- 
  tions with sweepback impose distinct limita- 
  tions on the effectiveness of flaps and the 20 
  percent increase in CL- by flaps is a typical- 
  if not high-value  for such a configuration. 