Discussion
Consider the following pairs of design change and its effect on cruise performance:
Raising aspect ratio - Lower induced drag
Increasing sweep - Higher drag-divergence Mach number
Thickening the section - Higher critical Mach number
Adding winglets - Greater effective span
How many of the pairs given above are correctly matched?
Answer: B
Correct answer: Only three
Higher aspect ratio lowers induced drag, sweep raises the drag-divergence Mach number, and winglets increase effective span - three correct pairs. Thickening the section does the opposite of what the fourth claims: a thicker section accelerates the flow more over its upper surface and reaches sonic conditions at a lower free stream Mach number, so the critical Mach number falls.
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