Jeff, To keep it simple - As you are referring to right triceps muscle push- you'd be limiting your discussion to hitting.
If you lose lag pressure when you release an accumulator- you've got problems!
Couldn't this slight increase in right tricept muscle force also be atributed to extensor action, it is impossible for the right tricept to ever be completly inert as some force must be exterted to creast extensor action to take the slack out of the assembly.
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If the right wrist flattens at or around impact, you will suffer from trajectile disfunction.
Couldn't this slight increase in right tricept muscle force also be atributed to extensor action, it is impossible for the right tricept to ever be completly inert as some force must be exterted to creast extensor action to take the slack out of the assembly.
Within the context Jeff's post- I was thinking any comment to right tricep pushing was used in the context of an acceleration force. Certainly, in the context of your post - regarding extensor action there would be right tricep muscle force attributed to extensor action- separate from any pushing acceleration force.
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Life Goal- Developing a new theory of movement based on Brain Science
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You wrote-: "Jeff . . . Homer said that he felt lag pressure so strong that he felt like he could lift himself off the ground . . . BUT he also said that lag pressure is measured out in ounces not pounds. That a pound of lag pressure would be too much to sustain . . . hmmmmmmm . . . . not really sure how to reconcile that."
That's my problem understanding lag pressure and its affect on ball flight distance. Each club needs a different level of forward shaft lean at impact (more for short irons). Therefore, for a given amount of forward clubshaft lean and a given clubhead speed at impact, wouldn't the amount of lag pressure experienced at impact be the same for different swinger-golfers who do not drive load the shaft? How could there be variations in the degree of loss of clubhead forward speed due to impact? How could different golfers have different levels of a "heavy hit" (whatever that means)?
Jeff, the section I quoted from 2-E (6th edition) about zero deceleration was Homer's statement - a theoretical ideal not a practical one... but it does appear that he thought that some resistance to deceleration was possible by maintaining shaft stress through lag pressure.
This may be an area for TGM summit people ?
Perhaps scientifically incorrect but a very real feeling.?? LAG pressure at impact is the way to achieve it...if it is possible to resist deceleration....but then we want lag pressure at impact for other reasons (alignment / stop floipping)....
So stick with lag pressure - let science people worry about impact deceleration - but in the back of your mind accept that HK may have got that that bit incorrect...but he got the big bits right.
You wrote-: "Jeff . . . Homer said that he felt lag pressure so strong that he felt like he could lift himself off the ground . . . BUT he also said that lag pressure is measured out in ounces not pounds. That a pound of lag pressure would be too much to sustain . . . hmmmmmmm . . . . not really sure how to reconcile that."
That's my problem understanding lag pressure and its affect on ball flight distance. Each club needs a different level of forward shaft lean at impact (more for short irons). Therefore, for a given amount of forward clubshaft lean and a given clubhead speed at impact, wouldn't the amount of lag pressure experienced at impact be the same for different swinger-golfers who do not drive load the shaft? How could there be variations in the degree of loss of clubhead forward speed due to impact? How could different golfers have different levels of a "heavy hit" (whatever that means)?
Jeff.
Homer liked a "stock" amount of lag pressure . .. for consistency reasons I think. Hitters typically feel the load more due to the nature of the loading.
I'm not sure that there's a correlation of shaft lean to lag pressure . . . plus you may feel more pressure with longer clubs simply because they are longer. Bottom line you want to have a lag pressure that you can SUSTAIN and the PROPER amount of shaft lean for the shot you have selected and hopefully programmed at fix.
Austin was talking about a one-iron he made where he brazed a tungsten rod to the back of the club-face at the sweet spot. By doing that he increased Ma from what's normally about 0.2 kg to something much more. Maybe it was 0.3 kg.... So then assuming he could swing a "heavy" one-iron (say 0.3 kg) just as fast as he could swing a "light" one-iron (0.2 kg) tt (remember he was big and quite a strong athlete)
Vb = Vo (.3/.346)(1 + e) or Vo => 0.86 * 1.83 Vo = 1.58 Vo
1.58/1.48 = 7.2%
The ball would leave the club-face of Mike's modified one-iron having 7.2% more speed (provided he could swing the club just as fast). You see there is the catch. The heavier the club the more inertia it has. The more inertia it has the more force (and torque) is required to accelerate it. Over the years golfers have arrived at the optimal compromise for a given body type... we call that that "swing weight".
Its safe to say few people would be able to make Mike Austin's modified one-iron perform. Perhaps Sean Fister or Jason Zubak could...
Last edited by no_mind_golfer : 12-09-2008 at 11:45 AM.
Reason: still trying to make images show
You're welcome... I'll do a write up with the equations of motion (showing effect of spring stiffness as a variable on the collision response) eventually. I'm learning a new language (java) to make interactive web applets to simulate these effects as I type.
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