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The vertical stabilizer is to provide additional anti torque force to the fuselage once the aircraft has forward motion and airflow across the lifting surface. The design makes use of forward motion and the resulting airflow to create an anti torq...
Vertical (yaw) axis -- an imaginary line extending vertically through the intersection of the lateral and longitudinal axes. 1  Rotation about the vertical axis is called yaw and is controlled by the rudder. This rotation is referred to as directional control or directional stability.