Discussion
Four engine positions assessed on three criteria.
| Position | Bending relief | Engine-out moment | Access |
|---|---|---|---|
| Underwing pod | Good | Large | Easy |
| Rear fuselage | None | Small | Moderate |
| Wing root buried | Some | Small | Poor |
| Overwing pod | Some | Large | Poor |
Which position does the table suggest for a large long-range transport?
Answer: A
Correct answer: Underwing pod, for relief and access
The table shows the underwing pod alone scoring well on both bending relief and access, which are the two criteria that matter most on a large long-range transport - relief because the wing is long and heavily loaded, access because the aircraft must be turned round quickly and maintained economically.
Its penalty is the large engine-out moment, paid for with a bigger fin. That trade has been accepted on essentially every large transport built since the 1960s.
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