Thank you Allan for the compliment to my knowledge… I was fortunate to have the experiences "hands on"…. And lived them, studied them, researched and field tested my "theories", based on physics, concerning technique, physics, poles, differences between athletes from Warmerdam to Earl as a 16-8 jumper (1974-75) to Tully (1982-1988) to Tim Mack from college and specifically from August 1995 to his 5.90 jump at the trials in 2004.
That T-Mack jump is the one that should be viewed to know "where" he was Trying Extremely hard to go from at least August 1, 1995! To when it almost happened in 2000 and did happen in 2004.
I do have the VHS, somewhere, of Tim's training and focus over a 2/3 week time period, August 1995, of him establishing exactly and in detail what he had to do from that day forward to be a world class vaulter.
He came to California to confirm what "B" had been working with him on and to decide if he actually could be a world class vaulter or should he just walk away and get a job…
I think the USA as a whole, as should be all of the pole vault community in general, be satisfied/ecstatic with his choice to "change" in the direction of "physics" although it took NINE(9) years of sacrifice, extreme fortitude and guts to stayed with his focus… and he did kept a detailed log. But I see no reason for him to be "in the middle" of a "controversy" that will always have "nay-Sayers" or that is said "after" the fact.
What you see in that 2004 5.90 jump is as close as Bubka got, 99% of the time, to producing "Bubka" technique.
Kochel's book was published in 1981 but his methods had already been in practice in 1974 when I joined his staff. His book "Practical coaching Techniques for the Pole Vault" by Guy Kochel can be found online. But again what he says can be read and interpreted or twisted to fit one's own confirmation or denial, as you well know from your own writing.
The plant should be completed before the take-off foot has reached the ground. The over all sensation during the plant phase should be that of driving into the pole, and being behind and under the pole. (this does not mean "be under at the takeoff) At the completion of the plant, there is an extension of the right and left arms upward through the pole. (this does not mean "press" it simply means reach.) he continues with; "The vaulter must not press with the left arm because it will cause a stall on top of the bar. It is important to remember that the key to a good vault is a high, early, and aggressive plant.1. The top hand should be directly over the take-off foot.
The left arm guides the pole into the box and, despite what many coaches teach, the left arm should be straight when the pole hits the box.
And your "After"
The right knee drives……………………………straight left leg ….. action. Kotchel writes; The rock back action is continued until the hips are between the pole and head. (this is what was eventually termed "covering the arc of the pole")
Tim's 1995 NCAA vault is NOT his "corrected" technique, which he committed too and began to change in August of 1995.
Tim's 5.90 jump had a 13-8/4.16 take-off, 16-4/4.99 grip.. 9.3mps last two steps, 10cm/4 inches under, and was completed in 1.43 seconds with approximately a 30-32% bend.
Bubka's 1983 5.70 jump had these numbers… as reported by V. Mansvetov.. 3.98/13' takeoff, 4.99/5m grip.. 9.5mps… was completed in 1.45 sec.. with a 33% pole bend.
A Bubka 1987 jump had these numbers… as reported by McGinnis… 4.37/14-4 take-off, 16-10/5.10 grip, 9.5mps.. 10cm/3.9in under…..max height (6.12m) was obtained in 1.55 seconds one meter passed the bar… with 27.1% pole bend.