Discussion
Statement I: Rear-fuselage engines reduce the fin area required.
Statement II: The engine-out yawing moment is proportional to the engine's distance from the centreline.
In the light of the above statements, choose the correct answer.
Answer: D
Correct answer: Both Statement I and Statement II are correct
Both statements are correct and the second is the reason for the first. The engine-out yawing moment is thrust times the distance from the centreline, so moving the engines from a seven-metre wing station to a two or three metre rear-fuselage station cuts the moment to about a third.
The fin and rudder exist chiefly to balance that moment at low speed, so a smaller moment permits a smaller fin - which saves weight and drag, and lowers the minimum control speed on which the takeoff field length partly depends.
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