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Leading
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Trailing
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Fiig. 3.52    Stick-free permissible center of gravity travel.
3.3.16  Stick-Free Margin
    The stick-free margin is defined as
                                              H; = NL - Xc8                                     (3.137)
                               = -~ ),-                    (3.138)
For a stick-free stable airplane, the stick-free margin (H;) is positive.
   With stick-free, the permissible center of gravity travel (Ax') is modified as
shown schematically in Fig. 3.52.
3.3.77  Trim Tab
    A tab is a small flap hinged at the trailing edge of the elevator (see Fig. 3.53).
A deflection of the tab alters the pressure distribution over the entire horizontal
tail surface and hence gives a control over the hinge-moment coefficient. Thus, a
deflection of the tab also affects the floating characteristics of the elevator. As we
will discuss soon, the stick force directly depends on the floating characteristics of
　
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