Discussion
Consider the following statements about sizing outcomes:
1. Wing area is design weight divided by wing loading.
2. Installed thrust is design weight times the thrust-to-weight ratio.
3. Aspect ratio follows from the design point.
Which of the statements given above is or are correct?
Answer: D
Correct answer: 1 and 2 only
Statement 1 is correct: wing area is the design weight divided by the wing loading. Statement 2 is correct: installed thrust is the design weight multiplied by the thrust-to-weight ratio. These two are the analysis's principal outputs.
Statement 3 is false. Aspect ratio does not follow from the design point - it is an assumption fed into the analysis, needed before the cruise and climb constraints can be drawn. Once the wing area is known, the aspect ratio fixes the span, but it is chosen rather than derived.
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