A small business jet aircraft is flying at a true air speed of 428 knots in ISA conditions at an altitude of 18050 feet. Propulsion for this aircraft is provided by two small turbofan engines each of which, at this flight operating condition, has a core mass flow of 5.1 kg/s, a bypass ratio of 3.3, fan pressure ratio of 1.57 and a fan polytropic efficiency of 91.2%. It may be assumed that: Intake isentropic efficiency = 93% There are no pressure loses in the bypass duct The bypass flow propelling nozzle area is matched to this operating condition. 1 knot = 0.5147 m/s 1 foot = 0.3048 m For air, y = 1.4, R = 0.287 kJ/kg.K Calculate the stagnation pressure at the exit from the fan. Give your answer in kPa.