Question

What is endurance factor?

(a) \(\big[\frac{E_{max}}{C}\big]\)

(b) \(\big[\frac{E_{max}}{VC}\big]\)

(c) \(\big\{\frac{2u^3}{u^4+1}\big\}\)

(d) \(\big\{\frac{2u^4}{u^4+1}\big\}\)

The question was posed to me in examination.

I would like to ask this question from Cruise Method 1 topic in section Cruising Performance of Aircraft Performance

Answer 1

The correct option is (a) \(\big[\frac{E_{max}}{C}\big]\)

The explanation: The endurance factor is given by \(\big[\frac{E_{max}}{C}\big]\) where Emax is endurance and C is specific fuel consumption. The endurance equation is given by E=\(\big[\frac{E_{max}}{C}\big]\big\{\frac{2u^2}{u^4+1}\big\}\)lnω  where V is true airspeed, C is specific fuel consumption, L is lift, D is drag, Emax is endurance, u is relative airspeed and ω is fuel ratio.