I just don’t understand. Whole purpose of engines is to push the plane and get the air under and top of wings, right? So we already have air coming to plane, why is it bad?
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Planes are designed to be able to provide enough lift to stay airborne above very low airspeeds. In fact the wings are designed to change shape to increase lift at low speed by moving the flaps down.
Go too slow and the wing stalls, and the plane starts falling. This is why planes take off and lane into the wind as much as possible.
But anything above the upper limit of what is needed for lift ceases to be a benefit. At this point the airspeed creates excessive drag on the plane, slowing it down, and requiring more fuel and time to reach the destination.
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