Question

Which of the following is the formula for specific climb?

(a) SC=\(\frac{dH}{Q_f}\)

(b) SC=\(\frac{dH}{dt}\)

(c) SC=\(\frac{dH/dt}{Q_f}\)c

(d) SC=\(\frac{dH/dt}{Q_f}\)

This question was posed to me during an online interview.

Question is taken from Minimum Fuel Climb in portion Climb and Descent Performance of Aircraft Performance

Answer 1

Right choice is (c) SC=\(\frac{dH/dt}{Q_f}\)c

Easiest explanation: The formula for specific climb is given by SC=\(\frac{dH/dt}{Q_f}\) where SC is specific thrust, \(\frac{dH}{dt}\) is rate change of height with respect to time and Qf is fuel flow. The specific climb is calculated in the units of ft/kg.