I have recently developed a multi-computer networked simulation of a turbofan jet engine test cell control room, including a real-time simulated jet engine "model", PLC control logic, video playback of a engine at various states, and a throttle for maneuvering. I currently calculate all necessary engine parameters using 3-5 order polynomials based on a throttle lever angle from the physical throttle I built for the simulation (i.e. shaft speeds vs. TLA, TGT vs. TLA, P30/T30 vs TLA, etc), using actual engine data collected from our tests. It looks great according to my techs that are currently using it for training (start-up, shut-down, accel/decel). For version two, I've been trying like mad to generate a generic engine model that has, as inputs, the environmental conditions (ambient pressure/temperature), mechanical parameters (shaft speeds - 3 spool) and physical dimensions of the actual engine (rotor tip/hub dimensions, compressor blade angles, etc). The model I'm attempting to create will then, as outputs, have fuel flow, P30/T30, TGT, mass flow, thrust, among others. After collecting a a library of literature, I know I have everything in front of me I need, but not being a calc, trig, or even algebra guru, I've fallen short and must admit defeat. I have yet to complete a model that doesn't end in an unrealistic output. A simple example of what I'm currently working on, the axial compressor. Taking one stage (rotor/stator), and given the hub/tip dimensions, blade angle, rotational velocity; can I calculate the pressure/temperature rise? I'm also stumped on what input velocity to use, given this engine is tested on the ground attached to a stationary test stand. Finally my question; can anyone tell me (blunt is fine too, I can handle it), if I'm just marching down an endless path or if it's possible to calculate all engine parameters having only the environment, throttle angle, and physical engine dimensions as inputs? Forgive my ramblings, but after 2 months of investigation I have generated so many questions I hardly know where to start. Thanks for any help!