Intact Left Arm Flying Wedges Jul 15, 2017 19:58:21 GMT -5
Post by imperfectgolfer on Jul 15, 2017 19:58:21 GMT -5
So with all this flexion and extension happening before impact, what happens to the TGM concept of the intact LAFW? Is it still a useful concept to aspire to? Further, if any flexion/extension is occurring in the lead wrist , can one still truly stay 'On Plane' as defined by TGM?
Personally , I find it easier to have an AFLW (which I think means some flexion) with my right arm swinging method (with a reactive pivot) and this doesn't seem to instill any need for any 'extra' left wrist flexion before impact. Plus my strikes are generally straight and my bad shots are only pulls/pushes.
Also , here is the reply I received from Dr Cheetham:
"Yes it is interesting to me. I'm just at a conference speaking this weekend so pretty busy but I'll try and get to it this evening or tomorrow and have a look tomorrow afternoon might be good because it seems strange to me that they should be such a contrast especially since we've been talking about the wrist for many many years with TPI and many instructors such as Jon Sinclair. And a flexion extension graph makes perfect sense when you look at through especially with the other two motions, radial ulnar deviation and pronation supination."
You asked-: "So with all this flexion and extension happening before impact, what happens to the TGM concept of the intact LAFW? Is it still a useful concept to aspire to? Further, if any flexion/extension is occurring in the lead wrist , can one still truly stay 'On Plane' as defined by TGM?"
Dan Carraher's graph of his student golfer shows that there is a change in the degree of left wrist flexion from 23 degrees at P6 to 9 degrees at impact (which amounts to 14 degrees of left wrist extending happening over that time period), and that is very typical of golfers who use the bowed left wrist (AFLW) type of downswing action as described in one of my previous posts. Golfers who bow their left wrist in their downswing (like Gary Woodland and David Toms and Jon Rahm and Tim Burke) tend to have their maximum degree of left wrist palmar flexion as they "turn the corner" (which is somewhere between P5.5 and P6.2) and then they extend their left wrist during the remainder of their downswing. When they come into impact, they still have a small degree of left wrist palmar flexion present. If they are DHers, who prevent the clubshaft from bypassing their left arm between P7 and P7.2 (or even better to P7.4), then they will have no further "left wrist extending" action happening during that post-impact time period. Remember that Dan Carraher's student golfer only had an insignificant degree of "left wrist extending" of a mere 2 degrees between P7 and P7.4 (and it has nothing to do with ball collision that doesn't really affect the proximal clubshaft or the hands/wrist, although it may cause significant deflection of the peripheral end of the clubshaft).
The phenomenon of significant "left wrist extending" during the later downswing between P6 and P7 doesn't apply to golfers who use the intact LAFW technique (like Henrik Stenson, Adam Scott and Justin Rose) and I have never seen anybody present 3-D "evidence" that they are significantly extending their left wrist between P6 and impact. If they are also DHers (like Adam Scott) then they are obviously not extending their left wrist during the P7 to P7.2 time period as seen in the following capture image.
I still want to understand why Phil Cheetham found that the 94 pro golfers in his study had an increased degree of left wrist flexion happening in their late downswing between P6 and P6.9+ (even though Dan Carraher foolishly cannot see that phenomenon happening in Cheetham's study - see post #195 in the GolfWRX thread where he stated-: "Funny as Cheetham's graph shows exactly what I stated. Left wrist begins extending prior to impact and then levels off/flexes slightly due to collision at impact and then continues extending.") Cheetham's graph does show some "left wrist extending" happening after P6.9+ (which is likely an artifact because Phil Cheetham's 3-D system cannot accurately measure flexion-extension changes over a short distance of a few inches (eg. between P6.9 and P7). I therefore still want to understand why the pro golfers in Cheetham's study had increased left wrist flexion happening between P6 and P6.9+ (and likely P7) while Dan Carraher authoritatively claims that all pro golfers are rapidly/massively extending their left wrist between P6 and P6.9+.
Regarding the accuracy of measuring the change of the degree of left wrist extending happening at the exact moment of impact, 3-D systems are woefully inadequate. Dan Carraher wrote the following regarding his 3-D system-: "And on my system there are 18 data points from p6 where peak flexion occurs and where impact occurs. And there's 4 data points from p7 to p7.2.". If there are only 4 data points between P7 and P7.2, then are less than 2 data points between P6.95 and P7.05 and that's totally inadequate.
Compare that scenario to these capture images of John Oda's hands moving through impact - which were recorded at a sampling rate of 8,200 FPS.
I measured the left wrist's dorsiflexion angles in those capture images and there was no significant change through impact. People will obviously complain that parallax errors make measurements derived from 2-D images inaccurate, but I studied that effect by drawing lines on my hands prior to videoing my hands through impact and I demonstrated that the parallax distortion/error effect is extremely small and insignificant.