Flap deflection angle of a wing on lift to drag ratio?

AI Thread Summary
The flap deflection angle significantly impacts the lift to drag ratio of a wing, with extended flaps increasing lift but also substantially increasing drag. This results in a decreased lift to drag ratio, which is particularly relevant during landing and takeoff phases. Flaps enable wings to produce more lift at lower speeds, enhancing aircraft performance in these critical phases. Additionally, they can improve ground effect, especially in low-wing aircraft. Understanding this relationship is crucial for optimizing flight efficiency.
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How does the flap angle affect lift to drag ratio of a wing?
 
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As flaps are extended, the wings will generate more lift and much more drag. The lift to drag ratio goes way down.

As you may know, flaps are used primarily during the landing sequence and sometimes on takeoff as well. They allow the wings to generate more lift at slower speeds. They can also enhance ground effect, especially on low-wing planes.
 

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