Discussion
Match each quantity in List I with how it is obtained in List II.
List I
A. Wing area
B. Installed thrust
C. Stalling speed
D. Aspect ratio
List II
1. Design weight times the thrust-to-weight ratio
2. Design weight divided by the wing loading
3. An assumption fed into the analysis
4. From wing loading and maximum lift coefficient
Select the correct match.
Answer: C
Correct answer: A-2, B-1, C-4, D-3
Each quantity is matched to how it is obtained. Wing area (A) is the design weight divided by the wing loading (2); installed thrust (B) is the design weight times the thrust-to-weight ratio (1); stalling speed (C) follows from the wing loading and the maximum lift coefficient (4).
Aspect ratio (D) is the odd one: it is an assumption fed into the analysis (3), needed to construct the cruise and climb constraints before any design point exists. Three outputs and one input - recognising which is which is the point of the item.
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