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  Figure 1.15 illustrates the effect of weight on 
  stall speed on a percentage basis and will be 
  valid for any airplane. Many specific condi- 
  tions of flight are accomplished at certain fixed 
  angles of attack and lift coefficients. The 
  effect of weight on a percentage basis on the 
  speeds for any specific lift coefficient and angle 
  of attack 
  is identical. Note that at small 
  variations of weight, a rule of thumb may 
  express the effect of weight on stall speed- 
  “a 2 percent change in weight causes a I per- 
  cent change in stall speed.” 
  
  FLIGHT. 
  flight and maneuvers produce an 
  Turning 
  is similar to the 
  effect on stall speed which 
  effect of weight. 
  Inspection of the chart on 
  figure 1.16 shows the forces acting on an airplane 
  in a steady turn. Any steady turn requires 
  that the vertical component of Iift be equal to 
  
  EFFECT OF MANEUVERING 