In a thread on LBG - TGM perfect? - there is a discussion about TGM being the alpha and omega of golf. A well known TGM instructor – Michael Jacobs, GSED - has made some comments about the TGM being old-fashioned in some areas. This elicited the following response from Yoda, (Lynn Blake, site administrator).
[i]The Enemy Within
Not one sentence in the book indicates Homer was anything but open minded and non-dogmatic. “Complexity is far more acceptable and workable than mystery is.” What a great sentence.
Homer Kelley was a very cool guy. His understanding of Golf Stroke Mechanics had no progenitor. Nor, to date, even a parallel.
Meanwhile, we have today a captained handful of TGM ‘nouveau-sect’ focused on their own negative bias: Namely, their molehill perception of miniscule error against the mountain of irrefutable fact that is absolutely correct .
Few, if any, of those comprising this sect (which joys in confrontation) ever met the man himself. I find it very curious: These misfits – they welcome the characterization, at least with regards to TGM – readily acknowledge their debt to Mr. Kelley. Yet, they then turn their entire attention to damning his work.
All while flying the TGM colors.
An odd world, isn’t it ? [/i]
Yoda, by asserting so strongly HK’s work to be a “mountain of irrefutable fact that is absolutely correct “, also, paradoxically, sets the bar of excellence so high that if only one core idea is shown to be totally wrong will than put a serious doubt into it all.
Let’s look, for instance, at impact, a very important element in TGM, and see what HK has to say about it. No need for esoteric complexity or sophisticated mathematical equations to show a basic flaw in HK’s understanding of basic impact physics.
The moving clubhead at impact has acquired a certain amount of momentum in the down swing which is conserved during impact. Whatever the ball acquires as momentum, during impact, has to come from the clubhead and, as the total amount of momentum remains constant, by definition, reduces the momentum of the clubhead by an equal amount.
Giving up momentum, the clubhead slows down, thus decelerates. However, HK’s perception of ideal impact – consisting of zero clubhead deceleration – actually makes it totally impossible for any transfer of momentum to occur from the clubhead to the ball.
Hence KH’s point of view that, “Zero deceleration is what would give maximum ball speed for any and all approach speeds”, is not a “molehill perception of miniscule error“ but rather a serious fundamental error. (TGM, Impact Physics, 2-E).
Only if the clubhead is assumed infinitely heavy will the deceleration be approaching zero but for the real world case of collision of clubhead and ball there is actually a very large deceleration of the clubhead taking place during the transfer of momentum from clubhead to ball.