What is the purpose of an anti-servo tab?

An anti-servo tab serves the primary function of reducing the sensitivity of a control surface. By moving in the opposite direction of the control surface, it creates a force that provides more resistance to the pilot’s input. This is particularly important for larger control surfaces, such as a rudder or an elevator, where excessive sensitivity can lead to uncontrolled or abrupt responses.

The design of an anti-servo tab essentially helps to stabilize the aircraft's handling characteristics, making the controls feel less twitchy and more manageable during flight, especially at higher speeds. This is crucial for allowing pilots to maintain better control and to make more precise inputs during maneuvering.

In contrast, other options suggest functions that do not align with the purpose of an anti-servo tab. For example, increasing sensitivity would make control surfaces harder to manage, while balancing the weight of the aircraft and enhancing aerodynamic efficiency are tasks managed by different design features entirely.