the airplane at high 4 is very sensitive to small 
deflections of the control surface, the nonlinear 
gearing provides higher stick force stability 
with less sensitive control movements than 
the ‘system with a linear gearing. Figure 4.21 
illustrates a typical linear and nonlinear control 
system gearing. 
The second chart of figure 4.21 illustrates 
the typical control system stick force variation 
282