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# Can you Review the Putting Arc?

January 23 2004 at 1:52 AM

Geoff,
I saw a guy at a local golf course using one of these the other day and I have seen it on TGC recently as well in a few segments. Can you review it for me?

http://www.theputtingarc.com>/

 This message has been edited by aceputt from IP address 172.139.44.191 on Jan 25, 2004 12:01 PM

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172.129.208.86

# Not as Good as Others

January 23 2004, 7:52 AM
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Forum Owner
172.130.5.164

# More on The Putting Arc

February 5 2004, 9:35 AM

On the other hand, in the immortal words of my friend Bruce Hutchinson, sales director for the Putting Arc, even if you view the PA as flawed in theory, it still helps! In the main, that's probably true.

Cheers!

Geoff Mangum
Putting Theorist and Instructor
Geoff Mangum's PuttingZone
http://puttingzone.com>
Golf's most advanced and comprehensive putting instruction.

Over 575,000 visits and growing strong ...

518 Woodlawn Ave
Greensboro NC 27401
336.230.0612 home
336.402.1602 cell

 This message has been edited by aceputt from IP address 172.130.5.164 on Feb 5, 2004 9:37 AM

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172.162.226.162

# Putting Arc Co-Inventor Replies

April 4 2004, 10:17 AM

Dear Geoff,

I have read a couple of post that you have made on your forum. My browsing of your web-site has given me the impression that your are an intellectually honest individual and quite well read too. You seem to have a good understanding of three dimensional geometry. This is critical in understanding the basis of our patent.

In your post Why Straight Back and Straight Through? you make the following statement:

Your comment about the tilted angle of the shaft is why this oblique conic section is the relevant model for putting. The axis of the cone is seen as the golfer's spine (or a vertical line from pivot of stroke to surface), and the putter shaft is seen as tilted down to the ground just like the outer surface of the cone from apex to outer circle of the base. The putter's lie angle is the same angle as that between the cone's apex, base perimeter, and center of base.

This statement represents a misunderstanding of the application of conic sections as they relate to "The Putting Arc." The basic quadratic surface that we use is not a circular cone as you describe it in the link above but rather a right circular cylinder (e.g., like a "Pringles" can). As you know from your study of conic sections, a right circular cylinder is simply a degenerate type of a quadratic surface. All of the conic section formulas still apply.

As we define it, the axis of the cylinder is aligned with the center of rotation of the golfer's spine somewhere near the third thoracic (T3), vertebra (i.e. between the shoulder blades).

The radius, R, of our cylinder is simply the distance from thew axis of the cylinder to the center of the golf ball at address.

The plane which contains the end of this cylinder passes through the center of the ball. This plane also intersects the ground in a straight line that is parallel to the desired line of the putt (assuming the ground is flat).

The putting stroke that we teach with The Putting Arc(TM) is achieved by simple cylindrical rotation of the putter head about the golfer's spine (i.e. the axis of the cylinder). The face of the putter remains normal to the surface of the end of the cylinder at all times. I believe that you call this putting stroke: TILTED-PLANE STRAIGHT PATH.

Now we get to the elliptical part. The outline of the front surface of The Putting Arc(TM) is actually a projection of the end of this cylinder (i.e. a circle) onto the ground, i.e. an ellipse (the shadow in Fig. 1). The front surface of the putting arc is an "extrusion" of this elliptical outline up along the vertical axis.

The amazing thing about the three dimensional shape of The Putting Arc(TM) is ... If you move the putter head in simple cylindrical rotation about the axis of the cylinder defined above, the heel of the putter will maintain contact with the front surface of The Putting Arc(TM) and the face of the putter will remain normal to the tangent at the point of contact (i.e. aligned with the lines on the top of The Putting Arc(TM)). This is not a 2D training device, the heel of the putter rides up and down the front surface of The Putting Arc(TM) as you putt. The path of the putter head is exactly the "smile" that you claim we don't generate in your forum post.

I apologize for the confusion created by our robot, "Iron-Archie," which you observed at the PGA Show. Archie's pivot axis was obviously "out of adjustment." However, we remained convinced that our theory and geometry is sound. When Archie is properly set up his putter tracks The Putting Arc(TM) perfectly. I am sure of this. Not only have I seen Iron-Archie demonstrate this motion, I also have two separate CAD models, which confirm our mechanics. In these models I allow only one degree of freedom, rotation about the cylindrical axis. I can move the putter head to any position in the backstroke or follow through by simply changing a single angular dimension. For an animation of one of my models follow this link www.theputtingarc.com/Why It Works. and go to the bottom of the page. This is directly beneath the "fine print" that you reference concerning our "custom fitting" putting arcs.

My purpose in writing this is not to convince you that The Putting Arc is the best training device on the market (although we do have 200+ professionals using it.) But rather to insure that you have a thorough enough understanding of our product to give us a fair evalutaion. I would thoroughly enjoy any dialog that we might have for the purpose of improving our mutual understanding of the mechanics of putting.

Humbly yours,

Joey Hamilton
Vice President
The Putting Arc, Inc.
jhamilton@pobox.com

 This message has been edited by from IP address 172.162.226.162 on Apr 4, 2004 10:27 AM

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# Good Mechanics are Not Sound Biomechanics

April 4 2004, 10:24 AM