barrel/hand pivot point, a.k.a TTB

[Bobby Shirer]

Would this be the hands getting thrown off the "tilt a whirl"?

The centripetal force extends the hands but also keeps them rotating on the tilt a whirl. When they're thrown off, that's the hands continuing on their path without the influence of an outside force. Inertia.

 

[Bonesaw]

Bobby,

I thought this clip of Josh Hamilton is awesome. Watch his hands from 4-5 seconds. They seem to sit in the same place and just unhinge. Would like to hear your thoughts.

I (of course) attribute this to hip extension stopping them in their place. (all rotation almost seems to cease as hip extension occurs also).



(It's funny, I remember watching this exact clip on TV in 2008 and thinking he must have some strong wrists to hit it 500 feet like that.)

 

[TDS]

 

[Cornbread]

Bobby,

I thought this clip of Josh Hamilton is awesome. Watch his hands from 4-5 seconds. They seem to sit in the same place and just unhinge. Would like to hear your thoughts.

I (of course) attribute this to hip extension stopping them in their place. (all rotation almost seems to cease as hip extension occurs also).



(It's funny, I remember watching this exact clip on TV in 2008 and thinking he must have some strong wrists to hit it 500 feet like that.)

Front leg stabilized hip rotation (deceleration), core rotated barrel to the ball, shows the importance of the front leg, allowed barrel to whip

 

[julray]

How about some street shoes? Skates are made to create friction.

Skates are better on ice than street shoes, and two are better than one.

 

[Bobby Shirer]

Bobby,

I thought this clip of Josh Hamilton is awesome. Watch his hands from 4-5 seconds. They seem to sit in the same place and just unhinge. Would like to hear your thoughts.

I (of course) attribute this to hip extension stopping them in their place. (all rotation almost seems to cease as hip extension occurs also).



(It's funny, I remember watching this exact clip on TV in 2008 and thinking he must have some strong wrists to hit it 500 feet like that.)

I don't think his hips stopped prior to contact and his shoulders definitely have not stopped rotating. I'm looking at the knob of the bat coming toward us in the frame. At that point in time, if it's pulling toward us, then the barrel is lagging away from us. His rotational acceleration is slowing and so these two forces are causing the barrel to rotate around his hands.
The rotational acceleration slowing negates the Euler force and allows the centrifugal force to extend the bat. The same with his hands coming toward us is in the direction of the centripetal force causing the opposite action of the barrel.
Remember,
Acceleration around the curve causes bat lag (Euler force)
Speed around the curve causes bat extension and accelerates the barrel outward (centrifugal force) {not correct but easier to understand}
Acceleration around the curve has a strong negative effect on centrifugal force. - intuitively, bat lag is an easier force to create than barrel extension force-
I also see him applying some torque on the handle via a push/pull of his hand relationship to each other.

 

[Shawn]

Bobby,

I thought this clip of Josh Hamilton is awesome. Watch his hands from 4-5 seconds. They seem to sit in the same place and just unhinge. Would like to hear your thoughts.

I (of course) attribute this to hip extension stopping them in their place. (all rotation almost seems to cease as hip extension occurs also).



(It's funny, I remember watching this exact clip on TV in 2008 and thinking he must have some strong wrists to hit it 500 feet like that.)

I have many HR derby swings and many of them look like Hamilton, getting the hands out front with more bat lag. They are just HR derby swings.

 

[Rolling Hard]

Hamilton was always in a HR derby. Guess hitter.

 

[Rolling Hard]

I don't think his hips stopped prior to contact and his shoulders definitely have not stopped rotating. I'm looking at the knob of the bat coming toward us in the frame. At that point in time, if it's pulling toward us, then the barrel is lagging away from us. His rotational acceleration is slowing and so these two forces are causing the barrel to rotate around his hands.
The rotational acceleration slowing negates the Euler force and allows the centrifugal force to extend the bat. The same with his hands coming toward us is in the direction of the centripetal force causing the opposite action of the barrel.
Remember,
Acceleration around the curve causes bat lag (Euler force)
Speed around the curve causes bat extension and accelerates the barrel outward (centrifugal force) {not correct but easier to understand}
Acceleration around the curve has a strong negative effect on centrifugal force. - intuitively, bat lag is an easier force to create than barrel extension force-
I also see him applying some torque on the handle via a push/pull of his hand relationship to each other.

So could you break this down and explain how it works in a swing. Do we want more or less centrifugal force? More bat lag? more extension? help!
Torque on handle vis a push/pull? is the oar lock thinking? Can it be taught ? how?

 

[Rolling Hard]

For those who like details:


Rotating reference frame - Wikipedia
en.wikipedia.org › wiki › Rotating_reference_frame