Discussion
An elevator produces a pitching moment coefficient change of \( -0.012 \) per degree. To generate \( -0.18 \) it must deflect
Answer: A
Correct answer: 15 degrees
Divide the moment wanted by the moment per degree:
\[ \delta_e = \frac{-0.18}{-0.012} = 15^\circ \]
The result should then be checked against the travel available, typically 20 to 25 degrees, since a demand near the stop leaves nothing for manoeuvre or gusts on top of the trim requirement. The distractor 0.0067 inverts the division, giving an answer far too small to be a physical deflection.
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