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I'll give you simple example. I have custom made propellant, volume is approx 490cm3, so it's a pretty big. OpenMotors shows burn time 2.3seconds which is completely wrong. I'm still trying to tweak parameters in OpenMotor to get the formulas working at all in that software. When increasing...

@Rocket501 " you can get a decent initial guess" -> I do agree 100%, you will get some, some in bold, initial guess. Be sure not to blow yourself up when OpenMotors showing you 500psi but in the reality PSI can be times higher (this is the reason why I suggested to stay away from such...

I strongly recommend to avoid BurnSim and OpenMotor - they are at some point completely innaccurate. I havent investigated the source code but my real life tests and data from these simulations does not match. You can use them to get better understanding on parameters that affect burn speed and...