Multiple choice general knowledge

Floating caused by the phenomenon of ground effect will be most realized during an approach to land when at

  1. less than the length of the wingspan above the surface.

  2. twice the length of the wingspan above the surface.

  3. a higher-than-normal angle of attack.

  4. a lower-than-normal angle of attack.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ground effect reduces induced drag most significantly when the aircraft is within one wingspan of the surface. This reduction in drag causes the aircraft to 'float' or require less power to maintain lift during the landing flare. Being higher than one wingspan (option B) produces minimal ground effect, while angle of attack changes (C, D) are not the primary factor in ground effect floating.

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