text: The curves of figure 2.3 depict the changes in 
  the curves of thrust and power required due 
  to a 50 percent increase in equivalent parasite 
  area of the configuration. The minimum total 
  drag is increased by an increase in f and the 
  is reduced. ‘Also, the increase in f 
  GWL 
  and require a 
  will 
  reduction in speed at the new, but decreased, 
  (L/D)-. 
  The point of minimum power re- 
  quired occurs at a lower airspeed and the value 
  of the minimum power required is increased 
  slightly. Generally, the effect on the mini- 
  mum power required is slight because the para- 
  site drag is only 25 percent of the total at this 
  specific condition of flight. 
  
  increase the CL for (L/D)- 
  
  An increase in the equivalent parasite area 
  of an airplane may he brought about by the 
  deflection of flaps, extension of landing gear, 
  extension of speed brakes, addition of external 
  stores, etc. 
  In such instances a decrease in the 
  airplane efficiency factor, c, may accompany 
  
  101 