[Daryl]

Of course it deals with plane lines, it tracks the clubhead hundreds of times on every swing, measuring both the plane line and the plane angle that the clubhead follows.

A couple of follow ups:

- Do you know the difference between measuring and calculating?

- What do you believe Trackman measures?
Since you seem as an expert on the subject, you must know how far the clubhead is tracked for and what that period of tracking allows the machine to extrapolate?

In Trackmans case everything is measured except face angle, the numbers are raw data presented in easy to understand terms. Face angle is calculated from these other data sets.

Do you want to participate in a discussion or Bait me?

If it doesn't measure face angle between impact and separation then it doesn't know the effects of a Horizontal Hinge. It's based on a "Collision Theory" involving "Glancing Blow" to Back-end-calculate face Angle from Ball Spin. That's my problem with Trackman besides the ridiculously high price for using 30 year old technology. The Profit margin for that toy would make even "Bill Gates" blush!

Then, just like anything advertised today, they package it by claiming "New Science" and "New Laws". As though the Laws of physics have ever changed. Someone soon will have a duplicate machine for half the Price. Then Trackman will announce "New and Improved Laws".

It's not much different than selling a Driver and Promising Longer Drives or a club that helps you get it up in the air, or a wedge with "Stopping Power". It's the Indian, not the arrow.

If Trackman helps a player play better golf, then great. He learned a different way to swing a club. Like Okie did. But don't claim that all the old ways were bad or that the rest of us are misinformed.