Ground effect.
Ground Effect is the name given to the positive influence on the lifting characteristics of the horizontal surfaces of an aircraft wing when it is close to the ground. This effect is a consequence of the distortion of the airflow below such surfaces attributable to the proximity of the ground.
It is optimal within a distance from the surface approximately equal to the width between the wing tips.
I believe birds use it too, but they weren't taught in a classroom but on the job.
Pine River, Tinchi Tamba Wetlands, Brisbane. Pied or Little Pied Cormorant.
Ground effect.
Ground Effect is the name given to the positive influence on the lifting characteristics of the horizontal surfaces of an aircraft wing when it is close to the ground. This effect is a consequence of the distortion of the airflow below such surfaces attributable to the proximity of the ground.
It is optimal within a distance from the surface approximately equal to the width between the wing tips.
I believe birds use it too, but they weren't taught in a classroom but on the job.
Pine River, Tinchi Tamba Wetlands, Brisbane. Pied or Little Pied Cormorant.