"The influence of the earth" allows

1. Better observations of the environment by the pilot because of the wider field of view close to the ground
2. ✓The separation of aircraft at the lower speed, but the phenomenon disappears at an altitude of approximately equal span and performance declineCorrect answer
3. Achieving greater thrust to the ground - this effect disappears at a height approximately equal to the span of the aircraft
4. Achieve greater engine power to the ground (for engines without compressor)

Explanation

Ground effect ('The influence of the earth') reduces induced drag and increases lift for a given angle of attack due to the interference of the ground with…

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