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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The minimum takeoff speed is with the flaps down. If flaps were up, less drag, higher min take off speed. Someone did the math and figured it’s more efficient to take off with flaps down to reach 150mph to take off. Because with flaps up engine probably works even harder to get to 200mph the min take off speed with flaps up. Numbers made up.
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