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

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SUMMARY

The flap deflection angle significantly impacts the lift-to-drag ratio of a wing. As flaps are extended, they increase lift but also substantially increase drag, resulting in a decreased lift-to-drag ratio. Flaps are primarily utilized during landing and takeoff to enable wings to generate more lift at lower speeds and enhance ground effect, particularly in low-wing aircraft.

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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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