Question

Which of the following is the correct equation for minimum speed drag?

(a) Vemd=\(\sqrt[3]{\frac{ZW^2}{Y}}\)

(b) Vemd=\(\sqrt[4]{\frac{ZW^2}{Y}}\)

(c) Vemd=\(\sqrt[4]{\frac{ZW^2}{Y^2}}\)

(d) Vemd=\(\sqrt[3]{\frac{ZW^2}{Y^2}}\)

I had been asked this question in class test.

I'm obligated to ask this question of Minimum Drag Speed topic in section Aircraft Force Systems and the Equations of Motion of Aircraft Performance

Answer 1

Right choice is (b) Vemd=\(\sqrt[4]{\frac{ZW^2}{Y}}\)

To explain: The correct equation for minimum speed drag is Vemd=\(\sqrt[4]{\frac{ZW^2}{Y}}\) where Y is a constant, V is velocity, W is weight, Y is a constant and Vemd is minimum speed drag. Induced drag is the function of lift and caused when an aircraft is moving in the air.