Discussion
Rudder sizing on a single-engine aircraft is typically governed by
Answer: B
Correct answer: Crosswind landing and spin recovery
A single-engine aircraft has no asymmetric thrust case, so the sizing conditions that govern a twin's fin do not apply.
What remains are the two demands the question names: yawing the aircraft straight from its crab angle at the lowest speed of the approach, and generating the yawing moment needed to stop rotation in a spin, which requires rudder area that is not blanketed by the tailplane. Engine-out control governs a multi-engine aircraft, and cruise directional stability is met comfortably by a fin sized for either of these.
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