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Everything posted by Warlock

  1. Oops ! Should have said "What are the factors for increasing clubhead speed " not " What are the factors for increasing hand speed earlier?" Apologies for that error.
  2. What are the factors for increasing hand speed earlier? I've read the following: 1. Work done on the club is via the hands on the grip and is defined by 'Force x distance moved in the direction of the force' . So theoretically the more work done on the club will add more kinetic energy to it . Therefore if you want to increase your hand speed , you might want to increase the hand path or increase the hand force applied along that hand path or both. Also if you want to do more angular work on the club , you could add more Torque via your hands or more angular distance or both.
  3. Here is a video by Kevin Ryan demonstrating something called the 'Ryke Effect' (a mix of his christian and surname). He freely admits that he was wrong to infer that the 'effect' increases clubhead speed but he still claims it's a mechanism for closing the clubface . I thought that Dr Sasho Mackenzie's 'passive torque' concept (image below) could be a method to close the clubface without excessive muscular forearm rotation but this 'Ryke Effect' has thrown another possible mechanism into the mix . What are other members thoughts regarding the 'Ryke Effect' and is i
  4. I've been looking through the whole thread again but I don't understand the underlined part. How would the graph show that arms being used to maintain the chests acceleration?
  5. Wondering what the golfer has to do that will recreate those Pro movements (at the correct time in the whole kinematic sequence)?
  6. But this is the 1st graph I've seen on you-tube (of a PGA Pro) that seems to prove it.
  7. Jon Rahm's lead arm angular acceleration seems to be greater than his thorax in the downswing. Look at his kinematic sequence graph below where the blue line (lead arm) is steeper than the green line (thorax) . Doesn't this demonstrate the possibility that his shoulder girdles are being used more than his upper body pivot to angularly accelerate his arms in the early downswing?
  8. Example for CCV or ROC (i'm assuming they are the same unless I'm mistaken). If Dr Sasho Mackenzie is removing the SPV (angular swing plane velocity) aspect of ROC , then he must be concentrating on the HTV and inclined swing plane angle, but that still has dimensions of degrees/time (or radians/time).
  9. Note sure I understand the different ways that ROC can be measured. It's defined as 'how fast the face is closing' so I can assume it must be degrees/sec or radians/sec. And I suspect it is really only important during 'clubface/ball' impact period although one can assume it doesn't change much for measurements taken a few inches before impact. Yet Dr Sasho Mackenzie says the following : "All else equal, swinging the club faster will result in a higher RoC — what I call the swing speed knob — but you don’t start swinging slower as a result! The amount of lost distance will ha
  10. Not sure how you would be able to block a variable in a golf swing but I suspect there was also a limit on his budget to conduct a more detailed investigation. For example , I think grip strength might affect ROC but not 100% sure. Or maybe the golfer has strong forearms and prefers to use muscular effort to square the clubface rather than some passive torque concept . In Dr Sasho MacKenzies research model he found that switching on a forearm torque generator (if timed correctly) could significantly increase clubhead speed , which in turn could increase ROC. Also, wouldn't one need a
  11. Maybe no relationship at all ! What criteria is used for 'Driving Accuracy'? For example , if the golfer misses the fairway by a couple of inches or snap hooks out of bounds are they both deemed a miss? Dr Phil Cheetham also found other relationships between golfer swing biomechanics and 'Handle Twist Velocity' (which is directly related to ROC in some formula). The article is here if your interested. Dissertation (philcheetham.com)
  12. Hi All Looking at this AMG video below , was wondering whether it is just a setup issue at address that can prevent the pelvis moving prematurely towards the ball-target line ? So if if there is unweighting of the trail leg in the early downswing (while the 'Core' rotates the pelvis and spins the trail hip) , the improved AMG setup with centre line of hips directly over the ankle joints (or slightly forwards towards the mid-sole) will cure this issue? But is there an explanation why this is a cure?
  13. Warlock


  14. From what I've read regarding Dr Sasho MacKenzies, passive club squaring torque concept , there is not much active lead forearm supination (and/or right forearm pronation) torques being applied via the hands to square the clubface close to impact . So if that concept is being applied, isn't the ROC partially dependent on the degree of 'passive torque' and the amount of angular momentum it generates (around the longitudinal axis of the lead arm) as the left wrist ulnar deviates? The MOI of the 'forearm/club' unit reduces as lead wrist ulnar deviation occurs , and any residual angular momentum
  15. I've been reading through this old but interesting thread and wondering whether I could ask a question about the above video and the 'regain' in the right leg flex by P5 in the downswing. I'm assuming the 'core' (not sure what that means exactly) is turning the pelvis , but what is stopping the right hip joint from spinning prematurely towards the ball-target line? For example , if the right leg is becoming unweighted in the early downswing and regaining some flex with the right heel raising up , wouldn't the 'core' be spinning the right hip towards ball-target line?
  16. There is a good article by Dave Tutelman about grip pressure if you want to delve a bit more into the physics. Required grip pressure (tutelman.com)
  17. I didn't post on the original thread as I didn't think it had any relevance to my real question which is about the possibility of dual supination of the forearms after P5.5 (ie. approximately when the lead wrist starts to ulnar deviate). When I looked at the above graphs on the Sandtrap thread and also that Kelvin Miyahiri you-tube video , it gave me the impression that the lead forearm was supinating while the trail forearm was pronating just after P5.5 . But after seeing the same type of graphs on the John Sinclair video (which I assume were retrieved from his TPI 3D AMM database of
  18. Hi Erik I was asking whether there was an error in the TPI 3D AMM reporting of 'Trail Wrist Angles' that you previously posted (copy above). In fact , I've actually received another reply below from Dr Greg Rose (TPI) and he now confirms that there is/was an error. ""we helped AMM produce the avatar and gave them the data sets to use for normals on their software. It just looks like the report feature had the wrong unit (using a P instead of a S) in the report. But the graph looks good." So it seems that Jon Sinclair is correct , there is some dual supination of the forear
  19. Erik I found the below TPI AMM graph from one of your old posts in 2016 and its says that the +y axis for the 'Trail Wrist Angles ' is showing Pronation. Further there is a Kelvin Miyahiri you-tube that implies the same (see link below). But then I was watching Jon Sinclair video with Larry Rinker (link below) and if you fast forward to 25:11 he shows 'Lead and Trail Wrist Angle' graphs where the +y axis are both supination. He says that both forearms are supinating just after release . I found this confusing , so I contacted the TPI Customer Services about this and got an
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