Negative tail stall is:
Refer to figure.
The tailplane is a smaller lifting surface found aft of the main wing, on the tail of many fixed wing aircraft. Like the main wing, a tailplane is designed to operate with smooth airflow along its surface. When the airflow separates from the tailplane, this is referred to as a tailplane stall. The tailplane is designed to produce a downward force (resulting in "negative" lift). When the tailplane stalls, this downforce will no longer exist, resulting in a sudden uncommanded nose down pitching moment.
The tailplane is a smaller lifting surface found aft of the main wing, on the tail of many fixed wing aircraft. Like the main wing, a tailplane is designed to operate with smooth airflow along its surface. When the airflow separates from the tailplane, this is referred to as a tailplane stall. The tailplane is designed to produce a downward force (resulting in "negative" lift). When the tailplane stalls, this downforce will no longer exist, resulting in a sudden uncommanded nose down pitching moment.
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