#4 Accumulator physics...
 

THRUST 6-C-1 #4 "wherever the straight Left Arm contacts the left side. And. The picture with caption "#4 Edged Arrow.

Preface; I have been thinking about shoulder turn and the above has always been problematic to me.

The general thought seems to be the left arm is "moved" by the contact point with the chest. My belief is the left arm (#4 accumulator when not in line with the shoulders) is accelerated axially by a pure pull and radially by change in angular velocity of the turning shoulders. The 6-c-1 presentation is not helpful to my construction. Any contact between the arm and chest is purely incidental and not necessary for proper actuation of #4 accumulator.

Other thoughts??

HB

It's probably best to just think of #4 as pivot power. So however the pivot unloads it, whether a pure pull, a blast off, or a combo is correct.

I started this thread because this is a precision alignment and any arbetrary flap about or misapplication is bad.
These are some of the facts/considerations that
have gone into my thought:

1. The shoulder turn is around the spine.

2. The "HEAD", not the head, is the stationary center of the swing. That would place the "HEAD" at the intersection of shoulders and spine. Everyones physical head is located slightly different.

3. #4 Accumulator is an angle. If it releases off the chest it has a release angle of about 1 degree. Other wise #4 release range is from Max. angle- about 45 deg to the shoulders - to min. angle - in line with shoulders- 180 deg.

5. A "chest launch" produces uncentered rotation. And is little more than a #1 pp "lite" slid up the arm.

6. I see many golfers who have a sternum center, most pro"s have it back at the spine, "HEAD"

7...X etc.

Discussion?

All is part of TGM but 6-C-1 #4, as presented, can be problematic for alignment??

HB

I'm not sure I understand your concern. As long as the shoulder turn hard enough the arms will lag and then will tend to return to roughtly perpendicular to the shoulder.

wrt 3, I see #4 angle as hands going from in front of right pectoral to in front pf the sternum when released.

wrt 5-6, the rotation is uncentered anyway as the center of the arc (shoulder) is located away from the center of the pivot.

Included info
 

Here is a well done thread. I find no need to re-do it.

http://www.lynnblakegolf.com/forum/s...Max+%234+power

The author has his ME credentials from NIT mine are EE from NjIT but I do have a good ME background.

Please continue.

HB

For starters, #1 is not true even for a rotated shoulder turn. The spine is on the outside of the body and gets thrown around by the shoulder turn, however flat or steep.

2-H SHOULDER MOTION

p.2
"The spine, between the shoulders, is the center of the Shoulder Turn...."

HB

Yes, it says that, now reach up over your shoulder and put your middle finger on your spine and turn while keeping your head still - feel the finger move and look in a mirror and see it move. Now do it again but this time put your finger on your neck bone. :scratch:

My #2 - "head" vs. head. read. 2-H,p.2 last line, note " ". Ref. 1-H, p.last. Also, "you do not move your head, it is moved" (I believe this came from Ben Doyle). He ,(BD) often says "turn on the lable in your shirt".

HB