So AnFi - you are 3 nil down now - ball vs accelerometer - failed, speed calculation not including parallax error - failed, maths in rotor calculations - failed.
Anything else to add? Bearing in mind you have said your 'final' piece several times now.........
Oh, I forgot - the ball and parallax were just diverting sidelines that you were forced to argue - except that you introduced them to try and show how clever you were.......