Discussion
Sideslip angle is the angle between
Answer: C
Correct answer: The wind and the plane of symmetry
Sideslip angle \( \beta \) is measured between the relative wind and the aeroplane's plane of symmetry - the vertical plane through the fuselage centreline. It is the yaw-axis counterpart of angle of attack, which is measured in the pitching plane.
The last option in fact defines angle of attack, between the wing chord and the relative wind. The angle between heading and track is drift, an outcome of wind rather than of the aeroplane's attitude to the airflow, and the fuselage against the horizon is a pitch attitude. Only sideslip drives the fin's restoring moment, so it is the quantity every directional stability derivative is taken with respect to.
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