I can understand what you state about the hosel rotating counterclockwise around the sweetspot axis when the clubface closes - from a conceptual perspective. However, it doesn't "feel" like the hosel is rotating around counterclockwise when I swing through impact - even though I can understand the concept.
I can easily understand the painting brush analogy because the handle is in the center of the brush, and the brush ends are rotating around the sweetspot which is inline with the handle - because in that situation the handle stays centralised while the brush twists. I find it harder to mentally picture the situation if the handle is at one end of the brush and there is a straight line relationship between the grip end of the handle and the one endpoint where the handle attaches to the extreme end of the brush - because the handle will have to twist with that end of the brush.
I can understand what you state about the hosel rotating counterclockwise around the sweetspot axis when the clubface closes - from a conceptual perspective. However, it doesn't "feel" like the hosel is rotating around counterclockwise when I swing through impact - even though I can understand the concept.
I can easily understand the painting brush analogy because the handle is in the center of the brush, and the brush ends are rotating around the sweetspot which is inline with the handle - because in that situation the handle stays centralised while the brush twists. I find it harder to mentally picture the situation if the handle is at one end of the brush and there is a straight line relationship between the grip end of the handle and the one endpoint where the handle attaches to the extreme end of the brush - because the handle will have to twist with that end of the brush.
Jeff.
Then, use a paint roller. Slide the roller, twist it until it rolls, then keep twisting until it slides. It's the same analogy, with an imaginary COG.
Have you seen a lathe in action, and do you get that analogy?
The CG of the club (any club) is not on the sweet spot ... its at a point in space. But the club face sweet spot is connected to the hands via the hossel and shaft not some imaginary line connecting it. If it were not constrained by hands gripping the shaft connected to the hossel, the face would want to open (not close) on the downswing as the inertia caused it to want to line up with hossel on the plane.
The CG of the club (any club) is not on the sweet spot ... its at a point in space. But the club face sweet spot is connected to the hands via the hossel and shaft not some imaginary line connecting it. If it were not constrained by hands gripping the shaft connected to the hossel, the face would want to open (not close) on the downswing as the inertia caused it to want to line up with hossel on the plane.
Since I'm the only alcohol virgin on this website, I may be the only one that remembers this trick. They don't call me the lifetime designated driver for nothing. I remember things that happen in bars.
The COG of the fork and spoon is not inside the fork or spoon. But, we can identify that the Z axis of the COG runs through the edge of the glass, where the toothpick rests. I'm sure that this is the point that you're making. But, it's a nice trick to leave the waitress. It's a real head scratcher.
There can be a rotational center that runs through the COG, and this is what we're seeking. We're looking on the Z axis, as a center of rotation could be found on other axes. The Clubshaft cannot be a center of rotation, since there is nothing on the underside of the hosel to counterbalance the Clubhead.
There is nothing so sad as a beautiful theory destroyed by one awkward fact.....
Unless a golfer's grip slips (not recommended) the clubface maintains the relationship it had at the time the grip was taken to the back of the left hand. Because it is anatomically impossible to get the left hand "back and up" there (top of the backswing) with out some rotation, the face fans open on the way up and closes again on the way back down. (And it is unfortunate that the process is likely not anywhere near as precise as with a set of high quality gears... ala iron byron). This has nothing to to with angular momentum vectors axis of rotation or lathe imbalance forces either.
Because it is anatomically impossible to get the left hand "back and up" there (top of the backswing) with out some rotation, the face fans open on the way up and closes again on the way back down. (And it is unfortunate that the process is likely not anywhere near as precise as with a set of high quality gears... ala iron byron). This has nothing to to with angular momentum vectors axis of rotation or lathe imbalance forces either.
So, regarding your "beautiful theory", are you suggesting that the rate of closing is always constant in the Downstroke?
Instead of having "nothing" to do with Angular Momentum, would a delay in the closing have something to do with Angular Momentum and/or an axis of rotation?
So, regarding your "beautiful theory", are you suggesting that the rate of closing is always constant in the Downstroke?
Instead of having "nothing" to do with Angular Momentum, would a delay in the closing have something to do with Angular Momentum and/or an axis of rotation?
I'm not suggesting anything is constant in a real golfer... but yes.. the gears make the rate proportional to the arm rotation angular velocity and.. its not my theory gone bad .... its yours Yodasluke.
As I was thinking about issue this I asked myself: why would they would they design clubface rotation into the swing machine since it complicates the machine (one more DOF to contend with). I made a call and the answer was because that was the way Byron Nelson (the model) did it and also because they found they needed gearing there to help manage the deceleration. (It took Battelle 3 years to develop the iron byron and initially they were breaking a lot of shafts). Then I asked myself why does iron Byron Nelson and everyone else fan the face open on the backswing? The answer to that is... TRY IT. You can't not.
As far as leaving the face open at impact goes (delay in closing?) bottom-line is golfer's left hand is not getting back where it was at takeaway.
Many golfers look a lot different at impact than they do at setup... hands may be way forward... shoulders too open or too closed etc. They can compensate for different impact positions by intentionally (closing usually) the club face at set up. (You would be amazed at how "toe-in" my dad sets up with his driver but it works for him... he's ALWAY down the middle) That way when they get back to impact the face is aligned where they need it to be.
Get the back of your left hand back to facing the target at impact (like it was at se-up) and your club face will be fine......
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