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# Vertical putting arc

June 3 2005 at 3:13 AM

Hi Geoff.
Thank goodness you're back; you had me worried that the Puttingzone had disappeared into cyberspace.
My question concerns the vertical arc of a typical putting stroke. I'm hopeless at maths and physics. Is there some way of calculating the slope or angle of the arc of a sound putting stroke? For example two inches into the back stroke, the putter will be one inch of the ground and so on.
From reading your entries on the Forum I appreciate that the bottom of the arc is positioned in the centre of your body. This is its lowest point with the arc rising either side of this point. The putting stroke, say 6 inches either side of this centre point, is part of the circumference of a large circle, the pivot of which, I presume, is the base of your neck. For a taller golfer will the angle of the arc change? Using the example above, would the putter arc be lower, two inches into the backstroke, than it would for a shorter golfer? I don't know if this is making sense, but how does the length of the radius of a circle alter the slope of its arc?
The reason I ask is that the advice to keep the putter low on the back stroke breaks with the concept of the putter swinging naturally in a contained arc. Therefore if anything this is poor advice as it introduces an element of possible inconsistency in the stroke. Then again, in R.J. Brooks' The Trueplane Putting Trainer there is a red line on the acrylic guide that maps out a recommended putting arc. However, the arc on either side of the centre point is different, with the arc of the forward stroke rising more steeply than that of the back stroke. Is this acceptable or would it be better for the arc to be the same on either side?
Neville
Perth
Oz

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