Question

What is the relation between true air speed and equivalent air speed?

(a) VT=\(\frac{V_e}{\sqrt{\sigma}}\)

(b) VT=\(\frac{V_e}{4\sqrt{\sigma}}\)

(c) Ve=\(\frac{V_T}{\sqrt{\sigma}}\)

(d) VT=\(\frac{V_e}{3\sqrt{\sigma}}\)

I have been asked this question during an online exam.

The doubt is from Minimum Power Speed in section Aircraft Force Systems and the Equations of Motion of Aircraft Performance

Answer 1

The correct answer is (a) VT=\(\frac{V_e}{\sqrt{\sigma}}\)

To explain: The relation between true air speed and equivalent air speed is VT=\(\frac{V_e}{\sqrt{\sigma}}\) where VT is true air speed, Ve is equivalent air speed and σ is a constant.The true air speed have to be converted into equivalent airspeed before multiplication to derive the drag power equation.