By pulling on one of the sides the kite is not hit head on by the wind but a bit more from the side. But why does that cause it to not only move to the side but also to rotate the tip in the corresponding direction?
You are changing the incident angle of the wind, the angle which it hits the kite. This “pushes” the kite in a direction. I believe the rotation is caused by the other line (string) creating a rotational axis.
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