Discussion
Which statement about the engine-out sizing case is TRUE?
Answer: C
Correct answer: A twin generally faces a larger asymmetric moment than a four-engine aircraft of similar thrust
Total thrust being equal, a twin's engines are individually larger and further outboard, so losing one removes a bigger share of the thrust at a longer arm. A four-engine aircraft loses a quarter of its thrust at the arm of an inboard or outboard engine, which gives a smaller yawing moment.
The other options invert the case: it sizes the vertical tail, not the horizontal, and it becomes more critical as speed falls, since the rudder's opposing moment goes with dynamic pressure while the thrust asymmetry does not.
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