When an aircraft is flying close to the ground, no more than a wingspan distance away, the air that flows over the wing tips to create wing tip vortices, are unable to fully form and instead, forms a cushion of air which contributes to a slight increase in lift and a reduction of drag.
When an aircraft is flying close to the ground, no more than a wingspan distance away, the air that flows over the wing tips to create wing tip vortices, are unable to fully form and instead, forms a cushion of air which contributes to a slight increase in lift and a reduction of drag.
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