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  1. Given up buying and reading golf books (whose instruction never fully worked) but I am busily helping Dr Jeff Mann in spotting errors in his newly edited, free, enormously detailed explanation on the biomechanics of the downswing ( it's going to take me many days ). Pros - It relates to the technique that most golfing pros do (according to Dr Mann) Cons- Its extremely difficult to master Downswing (perfectgolfswingreview.net)
  2. Maybe it would be a good idea to define what a bowed wrist is first. For example: 1. I could just flex and extend my wrists back and forth like the video below. Arm Muscles: 27 Wrist Flexion and Extension - YouTube 2. I could radial and ulnar deviate my wrists like below Supination vs Pronation, Radial vs Ulnar Deviation of the Hand - YouTube 3. Circumduction movements of the wrists where there is a mix of point 1 and Point 2 happening simultaneously . OrthoIndy Exercises | Supported Wrist Circumduction - YouTube The question we must ask is what net e
  3. If you look at Clay Ballards swing in slo-mo near the end of the video (09:27 -09:33) , it almost seems like he got his right elbow stuck by his torso because he's straightening his right arm and wrist just before impact. I don't think he does the 'Sam Snead Squat' move to any great degree in his own swing and could be right hip spinning in his early downswing (look at 09:43) blocking the movement of his elbow .
  4. Seems like a the video is trying to explain that the golfer requires something called 'lag tension' to get to a good impact position with some forward shaft lean. I don't understand what 'lag tension' actually is apart from maybe the tension one feels in the lead arm when the dynamic weight of the club maxes out just after impact. But personally , I don't think I need a training aid with some visual etched line to provide me a guide on how to feel that position. Actually ,there was quite a debate on another forum regarding lag tension where Bertie Cordle got personally involved to defen
  5. Although Padraig has tried to explain the hip movement in his own style , there is an alternative theory that could explain the 'what/how' is happening from an anatomical standpoint (but it will take a lot of mental stamina and further investigative work to understand the function of the muscles being discussed). Once you have committed several hours reading through it all in detail you will have (in my opinion) a better appreciation of how the pelvis moves in pro golf swings. http://www.perfectgolfswingreview.net/pelvicrotation.html The above article is complemented in the below
  6. The graphs above are really describing the movement of the club in space as per diagram below, from top of the backswing P4 to impact P7. They are describing the 'spin' of the club around its COM. So basically the 'Hand Couple' and the 'Moment of Force' (which is also a couple ) has spun the club from P4 to P7 in the time taken to perform the downswing. Using my own driver characteristics : The COM is about 11 inches from the base of the club (ie. length AB =R) = 0.28 Metres Point B will have rotated 270 degrees from P4-P7 = 4.7 radians For a typical pga pro
  7. When I look at 'Moment Of Force' graph below (black line) it is therefore representing the 'spin' of the golf club around its COM , not the clubhead (or its COM) rotation around the 'Mid-Hand Point'. Further , 'Hand Couple' (blue graph) is also a 'free vector' and will also cause the club to 'spin' around its COM. What we really need superimposed on the below graphs are 3 more graphs . 1. Speed of clubhead sweetspot vs time 2. Speed of COM of club vs time 3. Net linear force applied by the hand vs time Then we might be able to relate what proportion of '
  8. Is there anyone out there who has a background in physics and maths? I'd like to exchange some private messages with them concerning some issues I don't understand about the golf swing kinetics. Example : I have looked at Dr Sasho MacKenzie's 'Intro To Club Kinetics' VIMEO video below (see up to 06:00 ) and the physics looks wrong. https://vimeo.com/158419250 Sasho says 'Eccentric Linear Net Force' will cause a 'Moment of Force' (ie. Torque) that will rotate the clubs COM (centre of mass) to line up with the net force (see image below). I have plotted the movemen
  9. For anyone who remembers their old school physics lessons where their teacher used to teach by rote (which my one did and didn't really understand physics at all) this might be confusing. But one can clearly see how easy it is to misinterpret Newton's 2nd Law when applying it to the golf swing. One can end up with a completely wrong perception on how to hit the ball a long distance. https://twitter.com/i/status/1333958039049744387 Dr MacKenzie polled some questions regarding Newtons 2nd Law on his twitter below and there are some surprising results.
  10. Here's some proof that might show there is no motorcycle move and also a bit surprising about the golf swing in general. This is research done by 'Choi' where they've put sensors on the golf grip to measure torques and forces applied via the hands . Look at graphs O and S which show the left and right hand torques applies on the grip (ie. clubshaft twist ). If your into physics you need to use the 'right hand rule ' to visualise the rotation of the club that will produce a torque vector in the 'Z ' axis direction on the coordinate system (connected to the club in that left image).
  11. This video is really interesting and way before Tyler Ferrell and Monte Scheinblum started using the 'reverse motorcyle move' , but is it correct ? Have a look at this new article that goes into great depth What effect does lead wrist bowi (perfectgolfswingreview.net) Maybe some of the more technically minded forum members might be able to fit all the pieces of the puzzle together better than I can.
  12. You do understand that Monte Scheinblum is one of Golfwrx sponsors so posting alternative opinions is a banning risk . I don't think Monte himself would demand someone be banned but some of the 'shills' might do so on his behalf. What if I can provide some research data that casts doubt on any 'motorcycle move' in the downswing? It might help your swing using the qualitative opinions of Monte and Tyler but is it really happening the way they proclaim? I can provide the graphs that show the flexing of the lead wrist for 97 golfers which may provide some rationale why Tyler Ferrell a
  13. Golfwrx has definitely gone downhill and seem to ban members whenever they cast doubt on golf instruction especially if the golf instructor also happens to be a sponsor of their site. I can understand the financial reasoning but its not very good for golf instruction if people are banned for posting alternative opinions. There also seems to be a clique of forum members waiting to attack as a group anyone who does not conform to their ideas. They are especially sensitive (and fearful) about modern biomechanical research which is slowly progressing closer to the truth about the kinetics a
  14. Been looking at the physics of the swing for a few years now and things have changed . I first though that the sudden change in the hand path caused the increase in clubhead speed but its just an enabler to create tension in the shaft. In fact , its the pull on the club that creates the clubhead speed (Duh!) . What's really happening in simplistic terms is the clubhead is made to move in one direction (ie. hands start it down and outwards away from the target) but then the hands start moving in another direction (down and out targetwards), this creates tension in the club and pulls at
  15. I still don't understand how pushing the right leg/foot down and twist the foot/knee against the friction of the ground can provide enough twisting force to move a heavy pelvis around in the downswing . Imho , seems like a lot of twisting stress put on the right knee. I find it more realistic to regard the pelvic rotation happening (from P4-P5) due to the powerful contraction of the pelvic rotary muscles. Backswing : Basically you use your torso muscles to move your pelvis around , while your right foot is stabilised on the ground and that stretches those right sided pelvic
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