Hi there. I am trying to work out a basic turbo fan model for a simulator I am working on and I have got a bit lost. I’m ok with ridged body physics but this is a bit outside of what I know. Here’s what I have so far given that the engine is running: So, the compressor sucks air in at the front increasing the pressure of the air entering the engine. I am using this to calculate the force of the compressor: BladeForce = 0.5 * DensityOfAir*(VelOfBlade* VelOfBlade) * AreaOfBlade CompForce = (BladeForce*LiftCoeff)*NumBlades I am using what I know from ridged body simulation to do this so it might be nonsense. I thought that having got the overall force applied to the air by the compressor I could then get the acceleration of the air through the engine but I cant work out how to apply the CompForce to the air. I think I need to work out the pressure exerted on the volume of air in the compressor stage. Then I would be able to calculate the volume of air being forced into the combustion chamber (Around 12% of overall intake?). So then the issue is how hot the combustion chamber is given the amount of fuel. This then expands the air coming in and forces it through the turbine stage. This is a big blind spot in my knowledge. I can’t find any formulas for air expansion under heat so if anyone knows a good online resource that would help a great deal. I read somewhere that air pressure goes down when it expands but I assume the expansion causes acceleration that exerts pressure on the turbines. I think I might be a bit confused about pressure in general. If I know the pressure coming out of the combustion chamber I think a can calculate the effect on the main turbine and fan turbine. The overall pressure coming out of the engine will then allow me to calculate the thrust. Keep in mind that I have no education in physics and just do this for fun. I’m actually a computer programmer. So please keep any answers relatively simple, well as simple as this stuff can be. Sorry for the massive post, I did try to condense it as much as I could. Any info at all will be much appreciated.