Question

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

Answer 1

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.