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Old 10-08-2010, 03:43 PM
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Originally Posted by footwedge View Post
Where can i find the d-plane in Homer's book?
D-Plane comes from Theodore Jorgenson's "The Physics Of Golf." Not a Homer Kelley concept.

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Old 10-08-2010, 05:48 PM
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Well this thread is making its rounds on the net for the "haters".

I dont think Homer knew it all in terms of ball flight but he knew a heck of a lot more than most, even his wording suggests that he knew there was more to this but could not prove it without more sophisticated study.

The direction of the ball will always be practically at right angles to the Clubface
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Old 10-08-2010, 09:38 PM
footwedge footwedge is offline
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Originally Posted by gmbtempe View Post
Well this thread is making its rounds on the net for the "haters".

I dont think Homer knew it all in terms of ball flight but he knew a heck of a lot more than most, even his wording suggests that he knew there was more to this but could not prove it without more sophisticated study.

The direction of the ball will always be practically at right angles to the Clubface
Who are the hater's and what are they saying? Is the direction of the ball at right angles to the face the same as the d-plane? Can you add more to this.
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Old 10-09-2010, 01:03 AM
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Originally Posted by footwedge View Post
Who are the hater's and what are they saying? Is the direction of the ball at right angles to the face the same as the d-plane? Can you add more to this.
Nope he said practically right angles . . . to be inferred that it wasn't 100% . . . 2-B talks about the tilting of spin axis of the ball also mentioned in 2-D-O more in 2-E. . . homer understood that all divots were down AND OUT . . See 1-L . . . maybe not exact according to Jergenson . . . but he was certainly sniffing it if he didn't have it.
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Old 10-09-2010, 01:14 PM
footwedge footwedge is offline
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Originally Posted by 12 piece bucket View Post
Nope he said practically right angles . . . to be inferred that it wasn't 100% . . . 2-B talks about the tilting of spin axis of the ball also mentioned in 2-D-O more in 2-E. . . homer understood that all divots were down AND OUT . . See 1-L . . . maybe not exact according to Jergenson . . . but he was certainly sniffing it if he didn't have it.
I think the tilting of spin axis of the ball and the divot been down and out aren't enough for your claim about Homer and the d-plane , from what i have read about the d-plane there is alot more to it than that. Seems a bit of a leap.
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Old 10-09-2010, 02:21 PM
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Is D-Plane D-Answer?
Originally Posted by footwedge View Post

I think the tilting of spin axis of the ball and the divot been down and out aren't enough for your claim about Homer and the d-plane , from what i have read about the d-plane there is alot more to it than that. Seems a bit of a leap.
From a practical standpoint, what can the D-Plane concept do for you that 1-L #5 through #17 cannot? Also, on what other basis -- practical or theoretical -- is it superior?

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Old 10-09-2010, 05:05 PM
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Originally Posted by Yoda View Post
From a practical standpoint, what can the D-Plane concept do for you that 1-L #5 through #17 cannot? Also, on what other basis -- practical or theoretical -- is it superior?

Is the d-plane Homer's work or not? Just a simple question yes or no. That's all i want to know. It is superior in that it is way more complete in all aspects of ball flight theory than anything Homer wrote, like it or not.
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Old 10-09-2010, 09:29 PM
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Originally Posted by Yoda View Post
From a practical standpoint, what can the D-Plane concept do for you that 1-L #5 through #17 cannot? Also, on what other basis -- practical or theoretical -- is it superior?

There are now two camps, one espousing Kelley’s work the other Jorgensen’s. This is like disputing the value of the chicken over the egg. One is an integral part of the other. One is the machine (1-L #5 through #17) the other the result (D-Plane). Without either both are poorer.
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Old 10-09-2010, 10:03 PM
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Originally Posted by Yoda View Post
From a practical standpoint, what can the D-Plane concept do for you that 1-L #5 through #17 cannot? Also, on what other basis -- practical or theoretical -- is it superior?

I like this question. Anyone know the answer?
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Old 10-09-2010, 10:19 PM
Ringer Ringer is offline
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Originally Posted by Yoda View Post
From a practical standpoint, what can the D-Plane concept do for you that 1-L #5 through #17 cannot? Also, on what other basis -- practical or theoretical -- is it superior?

For one thing it explains Hogan's ball position chart much more clearly. Where does it say in 1-L 5-17 that one should open their stance as the low point gets further ahead of the ball? One must infer that information themselves based on other statements.

The D-Plane is there to help discern true path as opposed to plane line for the real resultant path of the clubhead during impact. It's been a while since I've brushed up on my TGM but I pulled it out for the sections you cited and cannot find any reference to true path. Is there another location I should be looking besides 1-L 5-17?

Also, something else D-Plane explains is that straighter shots come from higher lofted clubs than longer clubs. That's something I explained in the first video cited but I do not see any such mention by Homer.
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Last edited by Ringer : 10-09-2010 at 10:26 PM.
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