Explain in D-plane terms

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bcoak

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If I want to hit a fade or draw I open/close my stance, aim the club face at my target and swing along my body.
Why does this work in D-plane terms?
 
well if you assume the face is square at impact then open stance is out to in ball should curve to the right. Closed stance path is in to out ball should curve left of target. However, this assumes the face is square at impact meaning it would start straight and then do it's turning. That is how I understand it.
 
The ball CANNOT start on the face if the face does not match the path.

The ball starts on the PLANE between the face and the path, curving away from the path vector, moving towards the face vector, and out into the golf course.

You need to look at the "Snead at Augusta's 13th" picture.
 
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bcoak

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The ball CANNOT start on the face if the face does not match the path.

The ball starts on the PLANE between the face and the path, curving away from the path vector, moving towards the face vector, and out into the golf course.

You need to look at the "Snead at Augusta's 13th" picture.

Sorry, not following you
 
When a incompressible object (like a brick or a golf club) makes contact with a compressible object (like a golf ball) with a glancing blow (face does not equal path) the initial direction of the compressible object "would like to" leave in the direction of the face, but the glancing blow creates enough fiction that the path does have some degree of influence on the initial direction.

In other words, the path is the unpopular guy, but he must get invited to the party.

Now if the face and path directions are the same, then GREAT, the ball can leave in that direction.
 

Jim Kobylinski

Super Moderator
If I want to hit a fade or draw I open/close my stance, aim the club face at my target and swing along my body.
Why does this work in D-plane terms?

it doesn't; you're fudging it. at one point you probably didn't fudge it and hooked/sliced it off the earth and learned how not too and now you do as you describe.

Essentially lets say you closed your body 15* to the target, aimed the face at the target (0*) and swung out to right the right the same 15* and hit down on the ball say a couple more degrees.....that thing would snipe hook and be barely off the ground (depending on club).

BUT if you *think* you are doing the above but deliver the clubface much more open compared to where you "aimed it" at address you could hit a nice little draw no problem.
 
The in to out swing probably encourages the clubface to be more open to the target than you are attempting. Remember that it isn't where you have the clubface pointed at address but where the face is when the ball is leaving the face. If the face was square to the target you would likely hit the tree or hit it left of the tree you were trying to go around. That slow motion video is pretty clear! Thanks GG!

Steve
 
YouTube - Ball Flight Laws from Golf Evolution

Savy, can you explain your response in view of this video?

Comments:

Why does the ball look like an egg at address? Looks like there's some sort of distortion going on.

I don't think the yellow lines are drawn accurately. Close, but off.

It certainly appears that the ball starts closer to the face than the path, but I question the accuracy of the lines.

This demo is only showing horizontal directions; there is a vertical element as well.

This video doesn't change my mind so to speak. If someone wants to hang their hat on the ball leaving normal to the face when the face doesn't match the path, that's there prerogative, but sooner or later it'll bite them in the ass and they might have wished they didn't do it.
 
Yep. Depending on the difference in the path and face. The coefficient of friction between the particular club face and the particular ball, yada, yada.
 
If I want to hit a fade or draw I open/close my stance, aim the club face at my target and swing along my body.
Why does this work in D-plane terms?

I can't tell you how many push-fades I hit into trees trying to execute a fade around those trees using this method. I could always "feel" a draw on my own, but had to consciously manufacture an intentional fade. The D-plane explains why that didn't work.

Jim's right; thinking that's (the old way) what you're doing may work, but in terms of what the club is actually doing to the ball, there is no doubt.
 

ggsjpc

New
Comments:

Why does the ball look like an egg at address? Looks like there's some sort of distortion going on.

I don't think the yellow lines are drawn accurately. Close, but off.

It certainly appears that the ball starts closer to the face than the path, but I question the accuracy of the lines.

This demo is only showing horizontal directions; there is a vertical element as well.

This video doesn't change my mind so to speak. If someone wants to hang their hat on the ball leaving normal to the face when the face doesn't match the path, that's there prerogative, but sooner or later it'll bite them in the ass and they might have wished they didn't do it.

......and that's the fact, Jack!
 
Even Pelz figured this out with his putting data. Didn't he say (forgive me, book not in front of me) that clubface was only responsible of 85% of the putt's starting direction?

I'm a little surprised that the D-Plane is still under debate...
 
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