Danny,

We were doing more of a hypothetical calculation based on assumed values. There was never any expectation of a prefect answer.

There are not random errors in the calculations. The calculations are accurate. I calculate them multiple times in different orders. Only the values used have variability. Even the researchers who research helmet protection levels and the forces needed to cause a concussion have to make some assumptions.

If you read the thread from the start, you will see the comments about the assumptions made. The point is to put some basic understanding to how these forces work and how different variables effect the G forces. At least the calculations answer some of the questions, even if not perfectly.

** I am willing to explain the many issues. I did these calculations the first time over a decade ago. I am well aware of the inaccuracy involved. But, there is still value to understanding how these forces change.