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.