How does ground effect contribute to an aircraft's performance?

Ground effect is a phenomenon that occurs when an aircraft is in close proximity to the ground, typically within one wingspan height of the surface. This effect enhances lift and stability as the aircraft approaches and leaves the ground, which is particularly noticeable during takeoff and landing phases of flight.

When an aircraft is near the ground, the airflow around the wings is affected by the surface beneath it. This alteration in airflow leads to an increase in lift due to a reduction in the induced drag. Consequently, pilots may find that the aircraft feels as though it requires a higher angle of attack to maintain level flight during this phase, which can lead to a sense of enhanced performance. Furthermore, ground effect can provide increased stability, making it easier for the pilot to control the aircraft in those critical phases.

The other options do not accurately reflect the role of ground effect. For instance, while the sensation of decreased weight might be felt because of the increased lift, the actual weight of the aircraft remains unchanged. Ground effect does not produce additional thrust from engines nor is it related to communication with ground control. Thus, this phenomenon plays a vital role in improving lift and stability near the surface, significantly impacting an aircraft's performance during takeoff and landing.