Question

What is the correct expression for pressure drag?

(a) \(\frac{ZW^2}{V^2_e}\)

(b) YVe^2

(c) \(\frac{ZW^2}{V_e}\)

(d) YVe

The question was posed to me in class test.

My doubt stems from Minimum Drag Speed topic in portion Aircraft Force Systems and the Equations of Motion of Aircraft Performance

Answer 1

Right answer is (b) YVe^2

For explanation: The correct expression for pressure drag is YVe^2 where Y is a constant and V is velocity. Pressure drag is caused due to the resultant pressure distribution over a surface of the body. It is generally occurred in turbulent flow.