Discussion
The engine-out yawing moment is proportional to
Answer: A
Correct answer: Thrust and the engine's distance from the centreline
The yawing moment is a force times a moment arm, so it is the thrust of the remaining engine multiplied by its distance from the centreline:
\[ N = T \times y \]
Both terms matter, which is why a rear-fuselage installation at two or three metres produces a far smaller moment than a wing pod at seven. In practice the failed engine's windmilling drag acts at its own arm on the opposite side and must be added. Mass and bypass ratio play no part.
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