What type of tab is designed to help the control surface at high speeds when forces become excessive?

The type of tab that is specifically designed to assist a control surface at high speeds when aerodynamic forces become excessive is known as the spring tab. This design incorporates a spring mechanism that moves the tab in the opposite direction of the control surface movement, providing assistance during high-speed operations. This helps to alleviate pilot workload and enhance controllability by countering the increased aerodynamic forces acting on the control surface.

As airspeed increases, the control surfaces can become harder to manipulate due to the increased force required to deflect them. The spring tab helps to relieve some of this force, making it easier for the pilot to control the aircraft effectively at high speeds. This assists in maintaining aircraft stability and control under these challenging conditions.

In contrast, other types of tabs, like balance trim tabs, are used to relieve control surface loads but do not specifically address excessive forces at high speeds. Anti-servo tabs are designed primarily to reduce sensitivity in control surfaces, while servo trim tabs help establish the position of a control surface but do not directly counter excessive high-speed forces.