Drag divergence Mach number will increase by using _______________

drag-divergence-mach-number-will-increase-by-using

Drag divergence Mach number will increase by using _______________

A. area rule

B. increment in total volume

C. increase in drag

D. drag increment at maximum area

I got this question during a job interview.

I want to ask this question from Configuration Layout in chapter Configuration Layout Considerations of Aircraft Design

Correct choice is A. area rule

Best explanation: Drag divergence Mach number is that Mach number after which drag increases drastically. Area rule can be used to lower the drag up to 50%. By using area rule properly we can improve the drag divergence Mach number.