Which of these statements are correct or incorrect regarding a sideslip, with the relative airflow coming from the left, on an aeroplane that exhibits both directional and lateral stability?
I. The initial tendency of the nose of the aeroplane is to move to the left.
II. The initial tendency of the left wing is to move down.
Refer to figures.
Sideslip is the displacement angle of the airplane’s longitudinal axis in azimuth from the relative airflow. It is positive when the relative airflow is to the right of the longitudinal axis and negative when the relative airflow is left of the longitudinal axis.
An airplane has directional static stability if, when in a sideslip with the airflow coming from the left initially the nose tends to yaw left. Therefore, statement 1 is correct.
The lateral static stability is a measure of the airplane’s tendency to return to the wings-level attitude after a disturbance has caused the airplane to be disturbed in the rolling plane.
Positive lateral static stability is the tendency of the airplane to roll to the right with a negative sideslip angle, nose to the right. Its ability to recover is dependent on the effect of sideslip. Therefore, statement 2 is incorrect.
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