text: In addition to the general effect on .the in- 
  duced drag and power required at particular 
  speeds, a change in weight will require that the 
  airplane operate at different airspeeds to main- 
  tain conditions of a specific lift coefficient and 
  angle of attack. 
  If the airplane is in steady 
  flight at a particular C,,, the airpseed required 
  for this CL will vary with weight in the fol- 
  lowing manner : 