Discussion
Consider the following pairs of planform variable and what it primarily trades:
Aspect ratio - Induced drag against structural weight
Wing loading - Field length against cruise efficiency
Taper ratio - Loading distribution against manufacturing simplicity
Sweep angle - Fuel volume against skin friction
How many of the pairs given above are correctly matched?
Answer: C
Correct answer: Only three
Aspect ratio trades induced drag against structural weight, wing loading trades field length against cruise efficiency, and taper ratio trades the spanwise loading distribution against manufacturing simplicity - three correct pairs. Sweep is misdescribed: it trades the drag-divergence Mach number against low-speed maximum lift and structural weight, and while a swept wing does complicate the fuel tanks, that is not the trade it is chosen for.
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