Brian Manzella
Administrator
I pride myself in being able to name things.
"Confessions of a Former Flipper"
"The Soft Draw Pattern"
"Twistaway"
"tumble"
etc...
Anyhoo, here are a couple of MADE UP NAMES that we use here FOR CLARITY...
Resultant Path - a term coined by Mike Finney that means simply this: on a certain center-of-mass plane angle, pointed in a given direction, hit a certain amount downward, upward or level = the CLUB PATH number TrackMan reports and displays. In other words, the path that is the sum of all of those possible elements.
Effective Face - a term coined by me to explain simply this: THE CLUBFACE POSITION WHEN IT MATTERS. Let me explain this for the un-informed.
There is this thing Homer Kelley dubbed the "impact interval." This happens in half a millisecond. The face can close up to 0.8° during this time on a center-of-gravity and strike-point aligned strike. The ball gets it's programming at the point of maximum compression, approximately half way through the interval. That means <0.4° of clubface closure on a "good contact." So, on a normal "well struck" golf shot, the face might close 0.4°. It might close less. But wherever it is at MAX COMPRESSION that is the place in time that the ball cares about.
So, you have an impact clubface, and a maximum compression clubface and they may be EXACTLY the same thing on a perfectly struck shot, and they may be up to 0.4° different.
CLUBFACE AT IMPACT
EFFECTIVE FACE
Two different things some of the time on a perfectly struck shot.
Most folks don't hit the ball perfect most of the time.
So when the center-of-gravity and strike-point are not path aligned at impact, there will be some twist during the impact interval. On a slightly off-perfect strike, and a club with a high MOI, it won't twist much at all. On a much less than perfectly struck shot, and a low MOI club like a true blade, the face will twist a decent amount during the impact interval, and at least half of that by max compression when the ball gets it marching orders.
CLUBFACE AT IMPACT
EFFECTIVE FACE or CLUBFACE AT MAXIMUM COMPRESSION
CLUBFACE AT MAXIMUM COMPRESSION is all that matters to the ball.
But if you have a picture of the face at impact, it might be right, and it might not.
And BTW, TrackMan reports the club face number at MAXIMUM COMPRESSION.
All the time.
Now for those who don't already know this, when you hit a ball on the perfect spot on the face, and your reported RESULTANT PATH is 0° and your reported clubface is 2° open, the ball will start slightly to the right and curve further to the right.
And TrackMan will correctly report that clubface and path.
BUT!!!....when you hit a ball a decent amount toward the TOE, and your reported RESULTANT PATH is 0° and your reported clubface is 2° open, the ball WILL NOT start slightly to the right and curve further to the right!!!
It may even draw a fraction.
And TrackMan will have correctly reported the clubface and path.
And for those who can't read, that reported clubface is at MAX COMPRESSION.
Get it?
Re-Read it please if you don't.
It is not simple-dimple.
Now...
When someone sees a shot like the above toe hit example, and they say that is "bad numbers" reported by TrackMan, they are incorrect.
IT IS CORRECTLY REPORTED NUMBERS AND GEAR EFFECT AT WORK.
Still don't get it?
I hope you do.
One more thing, on TrackMan's website, there are NO SUCH TERMS AS "effective face" or "resultant path."
But there are here, on BrianManzella.com
"Confessions of a Former Flipper"
"The Soft Draw Pattern"
"Twistaway"
"tumble"
etc...
Anyhoo, here are a couple of MADE UP NAMES that we use here FOR CLARITY...
Resultant Path - a term coined by Mike Finney that means simply this: on a certain center-of-mass plane angle, pointed in a given direction, hit a certain amount downward, upward or level = the CLUB PATH number TrackMan reports and displays. In other words, the path that is the sum of all of those possible elements.
Effective Face - a term coined by me to explain simply this: THE CLUBFACE POSITION WHEN IT MATTERS. Let me explain this for the un-informed.
There is this thing Homer Kelley dubbed the "impact interval." This happens in half a millisecond. The face can close up to 0.8° during this time on a center-of-gravity and strike-point aligned strike. The ball gets it's programming at the point of maximum compression, approximately half way through the interval. That means <0.4° of clubface closure on a "good contact." So, on a normal "well struck" golf shot, the face might close 0.4°. It might close less. But wherever it is at MAX COMPRESSION that is the place in time that the ball cares about.
So, you have an impact clubface, and a maximum compression clubface and they may be EXACTLY the same thing on a perfectly struck shot, and they may be up to 0.4° different.
CLUBFACE AT IMPACT
EFFECTIVE FACE
Two different things some of the time on a perfectly struck shot.
Most folks don't hit the ball perfect most of the time.
So when the center-of-gravity and strike-point are not path aligned at impact, there will be some twist during the impact interval. On a slightly off-perfect strike, and a club with a high MOI, it won't twist much at all. On a much less than perfectly struck shot, and a low MOI club like a true blade, the face will twist a decent amount during the impact interval, and at least half of that by max compression when the ball gets it marching orders.
CLUBFACE AT IMPACT
EFFECTIVE FACE or CLUBFACE AT MAXIMUM COMPRESSION
CLUBFACE AT MAXIMUM COMPRESSION is all that matters to the ball.
But if you have a picture of the face at impact, it might be right, and it might not.
And BTW, TrackMan reports the club face number at MAXIMUM COMPRESSION.
All the time.
Now for those who don't already know this, when you hit a ball on the perfect spot on the face, and your reported RESULTANT PATH is 0° and your reported clubface is 2° open, the ball will start slightly to the right and curve further to the right.
And TrackMan will correctly report that clubface and path.
BUT!!!....when you hit a ball a decent amount toward the TOE, and your reported RESULTANT PATH is 0° and your reported clubface is 2° open, the ball WILL NOT start slightly to the right and curve further to the right!!!
It may even draw a fraction.
And TrackMan will have correctly reported the clubface and path.
And for those who can't read, that reported clubface is at MAX COMPRESSION.
Get it?
Re-Read it please if you don't.
It is not simple-dimple.
Now...
When someone sees a shot like the above toe hit example, and they say that is "bad numbers" reported by TrackMan, they are incorrect.
IT IS CORRECTLY REPORTED NUMBERS AND GEAR EFFECT AT WORK.
Still don't get it?
I hope you do.
One more thing, on TrackMan's website, there are NO SUCH TERMS AS "effective face" or "resultant path."
But there are here, on BrianManzella.com
