Question

In cruise performance the fuel mass flow determines the rate of change of mass of the aircraft.

(a) True

(b) False

I had been asked this question in a national level competition.

This interesting question is from Cruising Performance in chapter Cruising Performance of Aircraft Performance

Answer 1

Right option is (a) True

For explanation I would say: In cruise performance the fuel mass flow determines the rate of change of mass of the aircraft. It is expressed by the formula Qf=\(\frac{-dm}{dt}\) where dm is mass rate and dt is time rate. The fuel mass is always negative as mass of the aircraft always decreases.