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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Because planes aren’t the on the ground, they are in the air. This means that an aircrafts engines move it relative to the air, _not_ relative to the ground. A plane in the air will always going the same speed relative to the surrounding air, no matter what the wind is, sort of like you running in a moving train, you’re always going the same speed relative to the train, but your speed relative to the ground changes depending on if the train is going the same or opposite direction as you running.
So if the plane is going 100 km/h in the air, but the air is moving backwards at 50 km/h, then the plane would be moving across the ground at only 50 km/h, which means it will have to spend twice as long flying to get where it’s going.
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