The initial design of an IFR turbine is to be based upon Whitfield's procedure for optimum efficiency. The turbine is to be supplied with 2.2 kg/s of air, a stagnation pressure of 250 kPa, a stagnation temperature of 800°C, and have an output power of 450 kW. At turbine exit the static pressure is 105 kPA. Assuming for air that γ = 1.33 and R = 287 J/kg K, determine the value of Whitfield's power ratio, S, and the total-to-static efficiency of the turbine.