How can an airplane produce the same lift in ground effect as when out of ground effect?

To produce the same lift in ground effect as when out of ground effect, the airplane can achieve this with a lower angle of attack. Ground effect refers to the increased lift and reduced drag that an aircraft experiences when flying close to a surface, typically within one wingspan's distance of the ground.

When an aircraft is in ground effect, the air pressure below the wings is enhanced due to the proximity to the ground, allowing for effective lift generation at a lower angle of attack compared to when the aircraft is flying out of ground effect.

By reducing the angle of attack while in ground effect, the pilot can maximize the benefit of this enhanced lift, making it sufficient to maintain the same lift levels as in flight outside of ground effect without the adverse effects of stalling. Thus, the ability to produce the same lift with a lower angle of attack leverages the unique aerodynamic conditions present in ground effect.