Discussion
Match each engine position in List I with its dominant penalty in List II.
List I
A. Underwing pod
B. Rear fuselage
C. Wing root buried
D. Overwing pod
List II
1. Aft centre of gravity and a heavier rear fuselage
2. Large engine-out yawing moment
3. Interference drag and poor access
4. Difficult engine change and a cut-about wing box
Select the correct match.
Answer: C
Correct answer: A-2, B-1, C-4, D-3
Each position is matched to its dominant penalty. The underwing pod (A) suffers a large engine-out yawing moment (2) from its long arm. Rear-fuselage engines (B) bring an aft centre of gravity and a heavier rear fuselage (1).
Wing-root buried engines (C) are difficult to change and force the wing box to be cut about (4). An overwing pod (D) suffers interference drag and poor access (3), the nacelle sitting on the wing's most sensitive surface.
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