]> engine Generic turbofan cost model Christophe Bru Jo.Blogs@www.ac.uk engine.jpg This is a turbofan engine 24/01/2005 (15.23*(param1+32*param4)-13.24*param2-1.6*Power(param3,2))*2.874 This parametric equation is applicable for costing a turbofan engine based on its thrust, weight, TSFC and bypass ratio Thrust 60000 10000 150000 lb This is the thrust (in lb) that the engine must provide 50 Weight 2500 300 10000 kg This is the target weight (in kg) for the engine 30 TSFC 1.1 0.5 3 lb/hr/lb This is the target Thrust Specific Fuel Consumption (in lb/hr/lb) for the engine 20 Bypass Ratio 9 6 14 n/a This is the bypass ratio factor between fan and compressor exhausts 20