|
Post by imperfectgolfer on Sept 14, 2012 6:57:05 GMT -5
|
|
|
Post by imperfectgolfer on Sept 18, 2012 20:27:29 GMT -5
A few BM-groupies think that BM's video is great!
I would like to see them explain how a golfer can move clubhead low point in a full golf swing. I believe that low point is always vertically under the left shoulder socket in a well-executed full golf swing, and that a golfer should never try to alter that fact (as BM claims can be done by altering pelvic motion dynamics). I would like to see any person explain how it is possible to alter the position of low point - in a well-executed full golf swing.
Jeff.
|
|
|
Post by imperfectgolfer on Sept 22, 2012 11:34:56 GMT -5
In that video, BM admits that Trackman can be inaccurate when you get a zeroed-out clubhead path Trackman reading and a zeroed-out clubface orientation Trackman reading, but the ball flight is not straight - then BM states that one must infer that there is an off-center strike with gear effect operant. However, an off-center strike and a gear effect operant-effect may also be present when the ball flight is straight, and one should rationally/surely also infer that Trackman readings may also be wrong in that situation. The true reality is that any Trackman clubface reading is "calculated" and not measured, and that is the Achilles heel of Trackman readings. There is also the additional Achilles heel factor of how clubhead path affects the COG of the clubhead, and how it can potentially affect the ball flight even with a zeroed-out clubface orientation angle. BM discuses that specific issue in this video. vimeo.com/34394940That means that there is an additional confounding issue in play. First of all, the clubface orientation Trackman reading is a calculated value, and not a measured value. Secondly, even if the actual clubface orientation is zeroed-out at impact (relative to the ball-target line), it may not be be zeroed-out relative to the COG of the clubhead due to a non-zeroed-out clubhead path, and that fact can also have an unknown influence on ball flight. It increasingly seems that path/face angle conditions responsible for a specific ball flight cannot be accurately predicted by Trackman readings and there are a number of confounding factors in play. Jeff.
|
|
|
Post by imperfectgolfer on Oct 6, 2012 8:50:24 GMT -5
See this BM-forum thread. www.brianmanzella.com/golfing-discussions/17718-understanding-impact-2.htmlBirly Shirly wrote-: " D-plane is a model linking impact conditions and ball flight. TM isn't directly measuring path and face angle. Measured ball-flight (including spin) is used to back-fill or flesh out what can't be measured directly and with sufficient accuracy, including face angle. But the point isn't the method, the point is the validated accuracy - which I believe to be good." If Trackman isn't measuring path or face angle at impact, then what is it measuring? How can those measurements predict path and clubface angle accurately? Jeff.
|
|