Thanks bob. The pulley ratio is 2:1 so the speed of the flywheel is not as intense. I was wondering about the ratio on my detection system which is eagle tree with magnetic sensor. I have compared the rpm values with the brushless sensor connected directly to the motor to ensure I am representing the true rpm of the motor. The low rpm was shocking for the magnetic system with the eagle tree even though the Amps and volts were changing the rpm was the same for 0.5s at the start. I was using 2s charged with 12A and volts was 8.1-8.2 for the tests.

I have tried to use to use your software for the analysis but the curves of my data are difficult to model like you show on your YouTube videos so I have been using an excel file from old posts from John statham (I think his name was). Not sure if I need a better file to calculate my values.