Question 8. A jet engine aircraft is required to cruise for 3000 km at a constant altitude of 8 km. At the end of cruise the aircraft will weigh W KN.

The wing area of the aircraft is 80 m², Co for the flight is 0.04, CL is 0.3 and the aircraft's thrust specific fuel consumption is 105 kg N-¹ s¹. How much fuel will be used in the cruise? The answer should have units of KN. [4 Marks]