In order to have a straight plane line the clubhead needs to betravelling in a circular path. For this to happenn the clubhead moves from inside to square and then back to the inside.....remember that the square part of the circle is also the bottom of the circle, which is give or take a bit under the lead shoulder. The ball is placed before low point so the clubhead is travelling from the inside and the clubface is slightly open at impact and squares at seperation. Once the club the club reaches lowpoint it begins to travell back to the inside agian.
To find out if you are tracing a straigh plane line simply gab a flashlite or laser pointer and hold on to it like a golf club and take some swings. Find a line on the floor in your house (point the lite at the line) and imagin hitting a golf ball down it. As you swing back down towards impact watch the light or laser. If the laser stays on the line then the path is correct. It the laser is comming from the inside or outside you are not tracing a straight plane line.
Even better if you attach a laser from your right index finger and shine it to the line just in front of the sweetspot. This way you see both the straight line and the clubhead path
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I don't think so. I believe it's this:
If you stuck a laser where your right shoulder and arm come together, then on the downswing, the laser in the right shoulder should trace the straight plane line.
Mike Jacobs actually has a laser he uses for this purpose.
Leek
I think that you are wrong, and that Goley is right.
One traces the straight plane line with the clubshaft and the right index finger.
Pecky provided a link to a video of Morgan Pressel learning how to trace a straight plane line.
Here is series of capture images showing her tracing a straight plane line.
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I have drawn a green-dotted line over her laserlight wand shaft because it is not readily visible.
Here is series of capture photos from a swing video I made of myself tracing a straight plane line while holding a flashlight in my right hand.
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The green-dotted line represents the ball-target line and I am tracing that line with my right hand in a simulated swing using only the right hand. If the right index finger's pressure point site (area around first joint) can trace a straight plane line, then the clubshaft will be tracing that straight plane line. In other words, the right hand/forearm is responsible for controlling/directing the clubshaft's path and keeping it on plane, while the left hand controls the clubface.
Jeff.
Leek
I can readily agree that there is also an advantage to getting right shoulder to trace the same straight plane line. The primary function of the straight plane line idea is to get the clubshaft to trace a straight plane line so that it remains on plane through the impact zone. By getting the right shoulder to also trace the straight plane line, it makes it easier for the right forearm to be behind the shaft as it approaches impact and it allows the right forearm/right hand unit, and therefore the clubshaft, to more easily trace the straight plane line.
Jeff.