A large bypass ratio turbofan engine (JT9D engine from Pratt and Whitney, 1974) is described by its fan and core engine gas flow properties. (a) What is the overall pressure ratio (OPR) of this engine (b) Estimate the fan gross thrust Fc fan in lbf (c) Estimate the fuel-to-air ratio based on the energy balance across the burner, assuming the fuel heat- ing value is ~18,600 BTU/lbm and the specific heat at constant pressure is 0.24 and 0.26 BTU/Ibm . 'R at the entrance and exit of the burner, respectively (d) Calculate the core gross thrust and compare the sum of the fan and the core thrusts to the specified engine thrust of 43,500 lbf (e) Calculate the engine thermal efficiency and com- pare it to Problems 3.1-3.3. Explain the differences (f) Estimate the thrust-specific fuel consumption (TSFC), in lbm/h/Ibf (g) What is the bypass ratio of this turbofan engine