Discussion
Arrange these longitudinal control arrangements by increasing control power for a given area:
1. A conventional elevator on a fixed tailplane
2. A variable incidence tailplane with a separate elevator
3. An all moving tailplane or stabilator
Select the correct sequence.
Answer: A
Each step involves more of the surface in producing the control moment. The most powerful arrangement is also the lightest to move, which is why it normally carries an anti-servo tab to restore a sensible force gradient.
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