MANZELLA LIVE! Ustream Broadcast from June 1, 2010
- Thread starter Brian Manzella
- Start date
- Status
Jared Willerson
Super Moderator
I tried to watch it from my Iphone. Unfortunately they don't have that capability just yet.
You can watch a replay of it and other past broadcasts at the Ustream website.
birly-shirly
New
Why would you want to re-stress the shaft?
There might be more than one launch in the kinetic chain theory. In fact, almost by definition, isn't the kinetic chain a sequence of launches? But I don't think the answer is ever going to be consciously or subconsciously tieing the timing the body to the frequency of vibration of the shaft. Way, way too fast for that.
There might be more than one launch in the kinetic chain theory. In fact, almost by definition, isn't the kinetic chain a sequence of launches? But I don't think the answer is ever going to be consciously or subconsciously tieing the timing the body to the frequency of vibration of the shaft. Way, way too fast for that.
birly-shirly
New
I think there's time for 2 or more oscillations of the shaft prior to impact. So if you're talking about the flexing of the shaft as loading and unloading, I'd say yes. But if by loading you mean discrete or pulsed muscular forces applied to the club, I'd say no.
Brian Manzella
Administrator
Dr. Zick's Math Model
In Dr. Zick's, multiple-segment math model, there are multiple firings of torques to a non-bendable "shaft."
At the Manzella Symposium in Phoenix this October 11th, I will ask Dr.Wood and Dr. Zick's to get together on this one.
In fact, that is EXCACTLY the type of thing we plane to accomplish at this symposium.
In Dr. Zick's, multiple-segment math model, there are multiple firings of torques to a non-bendable "shaft."
At the Manzella Symposium in Phoenix this October 11th, I will ask Dr.Wood and Dr. Zick's to get together on this one.
In fact, that is EXCACTLY the type of thing we plane to accomplish at this symposium.
Kevin Shields
Super Moderator
Im under the impression you stress the shaft in the change of directions from backswing to downswing but load it halfway down when it goes from down to out.
Matt Bryda
New
What about stressing the shaft in the back swing to make it easier to stress it in the down part of the ball swing?
What about learning what the body needs to do to bend the shaft by way of the pivot? Stepping to the right and then to the left?
Are these things important to a dynamic golf swing?
Would this be a good question for the panel?
Matt
What about learning what the body needs to do to bend the shaft by way of the pivot? Stepping to the right and then to the left?
Are these things important to a dynamic golf swing?
Would this be a good question for the panel?
Matt
westy
New
Droop loading....?
Or
Are you meaning the loading state changes when the sweetspot comes out from hiding behind the shaft?
Droop?
In which case someone with a shut face at the top would load the droop differently than the open faced human...
Surely the club is always going down and out.
Or
Are you meaning the loading state changes when the sweetspot comes out from hiding behind the shaft?
Droop?
In which case someone with a shut face at the top would load the droop differently than the open faced human...
birly-shirly
New
This discussion desperately needs some definition of terms. "Stress", "re-stress", "load", "bend", "torque"
Matt Bryda
New
I'll give it a try,
stress = bends
torque = twist
load = pressure on the grip end exceeds the head end
Matt
stress = bends
torque = twist
load = pressure on the grip end exceeds the head end
Matt
mgranato
New
This is correct. The bending/stressing/flexing of the shaft at the top or transition happens in a different axis orientation (relative to the face) than the flexing during the release. At the top the shaft flexes while the club face is more or less parallel to the plane - this flex is basically happening in the 12:00 to 6:00 (toe to heel) axis direction. The shaft quickly rebounds from that flex as the arms start down. The next flex happens (hopefully) during the release as the club face is perpendicular to the plane - this flex is happening in the 9:00 to 3:00 (front to back) axis direction. Count the flexing at the take away, and you can have 3 distinctly separate and unrelated flexings. A very big reason why the better player with a good sense of feel can be tough to fit for the "right" shaft profile and flex.
Brian Manzella
Administrator
OK....
What Dr. Zick is saying is that there MUST BE an un-cocking action in the change of direction.
This is because the weight of the club would cause a complete FLOP in the change of direction.
Then, after a bunch of force PULLING the club, when the club is JUST SHORT OF VERTICAL for the last time pre-impact, there MUST BE MORE "force across the shaft" to generate anywhere near maximum power.
None of this has ANYTHING to do with shaft stress.
But, obviously, in the real world, it does.
And, Dr. Wood has talked about it.
"Different acceleration profiles at this 'JUST SHORT OF VERTICAL for the last time pre-impact' spot, for different clubs!
What Dr. Zick is saying is that there MUST BE an un-cocking action in the change of direction.
This is because the weight of the club would cause a complete FLOP in the change of direction.
Then, after a bunch of force PULLING the club, when the club is JUST SHORT OF VERTICAL for the last time pre-impact, there MUST BE MORE "force across the shaft" to generate anywhere near maximum power.
None of this has ANYTHING to do with shaft stress.
But, obviously, in the real world, it does.
And, Dr. Wood has talked about it.
"Different acceleration profiles at this 'JUST SHORT OF VERTICAL for the last time pre-impact' spot, for different clubs!
- Status