Questions I have....
 

In 1-L-11 Homer states that clubhead force and motion is on plane at right angles to the longitudal Center of Gravity and varies with the Speed, Mass and Swing Radius.

I don't understand this sentence because im unsure what the longitudal center of gravity is.....

In 7-3 Homer says that the on plane Right Forearm shows the precise direction it and the clubshaft must take throughout the stroke.

now I know that per 1-L-5 The clubshaft lays full length on a flat tilted plane. So my question is when we turn our hand so that the palm is touching the plane won't the whole right wedge come off and the right forearm go below the inclined plane due to the impact fix degree of bend in the right wrist?

In 2-C-1 what does Homer mean when he says the angled clubshaft and the closing clubface are rotating around the same center?

Re: Questions I have....
 

I don't have my book with me to reference, but I think this might mean rotating the hosel. When I had a lesson with Ben two years ago, he stressed the sweetspot rotates around the hosel.

Re: Questions I have....
 

Longitudinal center of gravity as opposed to the transversional centre of gravity.

To find the Longitundinal centre of gravity, hang a string with a weight on the end from the grip. The string should hang vertically and go through the club's sweetspot.

To find the transversional center of gravity, just try to balance the length of the club on your index finger. Obvisouly, the fulcrum (your finger) should be nearer the clubhead because of its weight.

Re: Questions I have....
 

Problably just a typo, but the hosel rotates around the sweetspot.

:wink:

I think he had 'er the first time...

Sweetspot rotates around hosel.....anyone?

Nope the hosel rotates around the sweetspot.

Reason being is that the sweetspot is the center of the club portion that strikes the ball, not the hosel. Does that make sense? Now it does appear to the eye that when you rotate the club during the golf swing it might appear as the face is opening and closing around the hosel. But you are not directing the hosel you are directing the sweetspot. This the longitudal center of gravity line which you can see but exists and the forces applied to the club recogize it.

Wow I really don't understand how that works lol. :shock: :P

Mathew Quote:
"In 2-C-1 what does Homer mean when he says the angled clubshaft and the closing clubface are rotating around the same center?"

See 2-C-1 #3 - notice the impact condition of the leading edge and the shaft - they line up and also notice the point of separation condition - both the leading edge and the clubshaft line up i.e. point at the end of the grip or the same center of the circle of rotation.

Now, look at 2-C-2 #3- Vertical Hinging - notice how the leading edge at impact does not line up with the shaft but at separation it does. Angled Hinging produces a somewhat similar situation, and per 2-J-1 "Angled Hinging gives the Clubface a Slice producing uncentered motion", anotherwords the clubface motion has a different center than the clubshaft center, or put another way - the clubface motion is not centered to the same center as the clubshaft motion.

Of course, so does vertical hinging but since these are typically short shots where the Venturi effect has little opportunity to effect curvature of the ball flight- the uncentered slice charactistic is an irrelevant point in these situations.

Maybe others can add, correct or clarify further, that's about the best that I can do in regards to this question.

Substitute the word hosel with the word shaft.
We do not hit the ball with the shaft plane but with the sweet spot plane. The hosel then would move around the shaft or hosel.
If you place a thin rod on the sweet spot of the clubface and extend it to the grip- it forms a wedge shaped triangle. It is the rod that is on plane and if you make a golf stroke motion from the top through store position into impact- you will see that the hosel or shaft rotates around the thin rod- the sweet spot plane.

(PHEW!!!)

Nice post Mike. That "Slice producing uncentered motion" concept has been lurking in my Incubator for a long time now. I think I can finally remove it. :idea: