text: re- 
  quired to produce the steady turn in a bank, 
  ’ ihe induced drag is increased above that in- 
  curred by steady, wing level, lift-equal-weight 
  flight. 
  In a sense, the increased lift required 
  in a steady turn will increase the total drag or 
  power required in the same manner as increased 
  gross weight 
  in level flight. The curves of 
  figure 2.28 illustrate the general effect of turn- 
  ing flight on the total 
  thrust and power re- 
  quired. Of course, the change in thrust re- 
  quired at any given speed is due to the change 
  in induced drag and the magnitude of change 
  depends on the value of induced drag in level 
  flight and the angle of bank in .turning flight. 
  Since the induced drag generally varies as the 
  square of C,, the following data provide an 
  illustration of the effect of various degrees of 
  bank : 
  
  .i :.,cyz’ 
  
  For the case of the steady, coordinatedturn, 
  the vertical component oft lift must equal the 
  weight of the aircraft so that there will be no 
  acceleration in the vertical direction. This 
  requirement leads to the following 
  relation- 
  ship: 
  
  *=- 