Swept Back Wing
A sweptback wing is one in which the leading edge slopes backward. When a disturbance causes an airplane with sweepback to slip or drop a wing, the low wing presents its leading edge at an angle that is perpendicular to the relative airflow. As a result, the low wing acquires more lift, rises and the airplane is restored to its original flight attitude.
Sweepback also
contributes to directional stability. When turbulence or rudder application
causes the airplane to yaw to one side, the right wing presents a longer
leading edge perpendicular to the relative airflow. The airspeed of the right
wing increases and it acquires more drag than the left wing. The additional
drag on the right wing pulls it back, yawing the airplane back to its original
path.
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