Discussion
A rolling moment derivative with sideslip is \( -0.09 \) per radian. At 6 degrees of sideslip the coefficient produced is approximately
Answer: B
Correct answer: Minus 0.0094
The derivative is per radian, so the sideslip must be converted before multiplying:
\[ 6^\circ = 6 \times \frac{\pi}{180} = 0.1047\ \mathrm{rad} \]
\[ C_l = -0.09 \times 0.1047 = -0.0094 \]
The distractor −0.54 uses degrees directly, which overstates the result by a factor of 57.3 - the commonest error with these derivatives, and one worth guarding against by checking the units of the coefficient before any arithmetic. The negative sign confirms a restoring moment.
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