Analysis of Air Transportation Systems Fundamentals of Aircraft ...

Basic Propulsion Forces Modeling Ideas• Thrust is a function of altitude (or density)+ A general thrust lapse function can be obtained using real enginedata (empirical data)• Thrust is a function of aircraft speed+ A more complex function can be obtained using real engine data(empirical data)+ The thrust losses during takeoff troll are significant as illustratedin the figures below• Thrust functions are provided by the enginemanufacturer in terms of tables (thrust vs altitude andmach number and thrust specific fuel consumption vsaltitude and mach number)Virginia Tech - Air Transportation Systems Laboratory 123