Question

For a given rubber engine, determine fuel burn at combat if combat time is 2.5min.

(a) 2.5*C*T unit

(b) 2.5

(c) 2.89 unit

(d) 2.63 kg

The question was posed to me during an interview.

I need to ask this question from Rubber-Engine Sizing in chapter Initial Sizing of Aircraft Design

Answer 1

Correct answer is (a) 2.5*C*T unit

Best explanation: Given, combat time d = 2.5 min.

Since SFC and thrust are not mentioned we will consider their notation as C and T respectively.

Now fuel burn = SFC * Thrust *Combat time = C*T*2.5 unit.