From what i understand, flaps are used to increase the lift produced by the wing. I also read that flaps slow down the plane, which why they are used to land. All explanations on the internet that I have been able to find boil down to : they increase the lift of the wing. They do not address the fact that flaps slow down the plane. That’s what I as wondering why keeping the flaps down doesn’t make takeoff less efficient, since the engines have to work harder in order to achieve minimum takeoff speed. So, : why do planes takeoff with flaps down ? Thanks
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If an airplane wing produces a lot of lift it will also produce a lot of drag. An airplane need lots of lift to take off and land at reasonable speeds. Jetliner needs low drag wings to fly fast. Flaps and slats are used to temporarily turn low drag low lift wing into high lift high drag wings.
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