With reference to the influence of "ground effect" it is true that

1. ✓This phenomenon disappears at an altitude of approximately equal span of aircraft / glider and performance declineCorrect answer
2. Significantly reduces the phenomenon of withstanding the landing phase
3. Significantly increases the stall speed
4. Improves gradient of climb at an altitude of 150 m

Explanation

Ground effect is an aerodynamic phenomenon that reduces induced drag and increases lift when an aircraft is flying very close to the surface (within one…

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