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_____________________ is a condition of improved performance encountered when operating near (within 1/2 rotor diameter) of the ground.

User PHeiberg
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Final answer:

The condition described in the question is known as the ground effect. When an aircraft or rotor system operates within half the rotor diameter of the ground, it experiences an improvement in performance due to the reduced aerodynamic drag and increased lift.

Step-by-step explanation:

The condition described in the question is known as the ground effect.

When an aircraft or rotor system operates within half the rotor diameter of the ground, it experiences an improvement in performance due to the reduced aerodynamic drag and increased lift.

This phenomenon is caused by the interference between the rotor's airflow and the ground, resulting in a cushioning effect that increases lift and reduces fuel consumption.

User RuMoR
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