Discussion
A yawing moment derivative of \( +0.09 \) produces, at 5 degrees of sideslip, a coefficient of
Answer: B
Correct answer: 0.45 in the restoring sense
The derivative is a slope, so the coefficient is its product with the sideslip angle:
\[ C_n = C_{n\beta}\,\beta = 0.09 \times 5 = 0.45 \]
The sign carries the meaning. A positive \( C_{n\beta} \) gives a moment that yaws the nose towards the relative wind, reducing the sideslip that produced it - a restoring moment, which is precisely what directional stability means. Had the derivative been negative the same arithmetic would give a destabilising moment of the same size, which is why the sense must be stated with the number.
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