Question

What will be the specific endurance of an aircraft having fuel mass flow 0.75 kg/s and true air speed is 300m/s?

(a) 400 m/kg

(b) 333 m/kg

(c) 133 m/kg

(d) 250 m/kg

The question was asked in quiz.

This is a very interesting question from Cruising Performance topic in section Cruising Performance of Aircraft Performance

Answer 1

The correct option is (a) 400 m/kg

For explanation I would say: The answer is 1.33. Given Qf=0.75 kg/s. The specific endurance is given by SAR=\(\frac{V}{Q_f}\)

On substituting we get SAR=\(\frac{300}{0.75}\)

SAR=400m/kg.