hey
Before I continue with these, hopefully "brief" points.. I want to remove the chart from the discussions.. it's not actually about the chart at all… the chart is my reference … the process makes the difference…improving and correcting the Approach run and takeoff is what we have been discussing.
These issues,
1. Under takeoff
2. None "free" takeoff (or Out)
3. Posture
4. Reached last step
5. Forced bending of the pole.
6. Stretched steps on the run
First a correct "impulse", penultimate takeoff is not actually a product of whither you were "born" with "hops". You have "hops" in relationship to your speed level and your speed level is proportionate to your strength/power and how you technically use it, meaning in a none stretched manner.
A correct "implused" takeoff is the result of a "long-short" last two steps and having the hips in the right position (none reached) prior to arriving at those two steps.
"Quickening" the last two steps is somewhat a better term. This is a very "subtle" move.. the faster you are running the more subtle it becomes…
Petrov said.. "The length of the strides is a little shorter as compared to sprint, the body is straightened. The length of the strides should not change abruptly. The 2nd last step is longer than the last one by 10-20 cm (optional)."
Most of the vaulters I have had to change, including Tully who in the first McGinnis data study, 1983?? had a long and LONGER last two steps… 6-9/2.05m to 7-1/2.15 last…
it was not a matter of "hops" but hitting the correct positions and that is only done by not stretching prior to those steps. Changing this became one of our three focuses for the Olympic year.
In '84 he had 2.13/7' penultimate & 2.06m/6-9. Last step. ----& 2.17m/7-2 & 1.98m/6-6……. In '87 he had 2.14m/7-1 & 2.00m6-6…
The vaulter doesn't actually "think" long-shot.. they think "quick-quick".. most athletes have said they "feel" like they have chopped BOTH of the last two steps.
How they get the long-short comes from doing a little practice in the long jump pit of course, but just for "feel" and to activate the right muscle groups…
The change comes mainly from how the penultimate step is taken in conjunction with the pole plant, posture, correct hip alignment and moving/pushing the right hip forward while keeping the right foot close to the runway… …and this can only happen if the vaulter is not stretching. Stretching takes you "out of position" before the penultimate and lowers the mass prior to the penultimate, making it virtually impossible to "dig yourself from the hole.. making you reach/fall.. onto the last step and into an "under" takeoff with the force going downward into the box.
Posture; Posture comes from function.. if you don't stretch or "chop" you have a better chance to have the correct posture.. If you do the 20/20 drill for speed/pole carry/posture work you will understand this.. the steps are one meter and short enough that you don't have to run maximum speed to keep the correct "posture"… if you are running your maximum speed and have to cover a distance "longer" than "normal" for your speed level…. to hit the board in the long jump or to hit the correct takeoff in the vault.. if you are too far out you will either have to speed up or stretch.. I don't know of any other choices in this scenario …. stretching is the loss of posture.
Speed is a product of stride length and stride frequency… two components, air time and contact time……….
Comparing a coaches check mark.. wither it's 4 or 6…
From Petrov
"This part in covered in 6 strides and equals to 17,0 – 17,5 m (shown by top athletes of the world) if measured from the back of the box.
The key to the correct vaulting technique lies in practically all the movements of the drop and push part of the run-up – both for the beginners and for more advanced vaulters.
Without changing the running pace and running position, 6 to 5 strides before the push, the vaulter begins the drop. This is done with the help of pulling and rotation (initial) of the right hand.
During the next two run-up strides (4-3 steps) the vaulter’s attention is focused on the slight thrust of the hips forward without losing control over the shoulders, maintaining their leading role in the run-up."
…………………………………………………………………………………………………………………………………………………………….
Bubka.. 5.85 jump (6.12 max height COM)’87 the max height COM was @105cm past vertical..
Pole…5.10/5.20 pacer…grip…5.10m.. Flex…?…Standards…?cm
Length last two steps………………..pen..2.10m...last…2.04cm
Speed last two steps…………………pen..9.46m/s..last..9.54m/s
pole angle at plant…………………………………....28.6 degrees
Vertical extension of plant arm at plant…………...99.4%
Takeoff toe in relation to grip…………………….. 10cm/3.9" under..
Takeoff toe in relationship to the box....................4.37m/14'4".........
Projected 4 and 6 step "MID" coaches mark...12.55m/41-2/16.69m/54-6
……….numbers at takeoff.. toe leaving the runway….
Horizontal Velocity of CG……………………………8.04 m/s
Vertical Velocity of CG……………………………....2.37 m/s
Resultant Velocity of CG……………………………..8.38 m/s
Takeoff angle…………………………………………16.4degrees
Pole bend %…………………………………….…….1.6%
Takeoff toe in relation to top grip……………...……. 2cm/
Pole angle just as toe leaves the runway………….…..29.6 degrees
Impluse.. duration of takeoff foot contact………….0.12sec
Maximum bend………………………………….........27.1%
Minimum effective pole length……………………..3.73m/12’2.7”
Angle of pole cord to vertical at maximum bend…..61.7degrees
Time of max bend after Takeoff……………………..0.49sec
Total time of jump……………………………………1.55sec
…………………………………………………………………………………………………………………………………………………………….
Tully.. 5.75 jump (5.81 max height COM)PRE 87 the max height COM was @66cm past vertical..
Pole…5.00 pacer…grip 4.92m.. Flex…?…Standards…?cm
Length last two steps………………..pen..2.14m...last…2.00cm
Speed last two steps…………………pen..9.34m/s..last..9.43m/s
pole angle at plant………………………………....29.2 degrees
Vertical extension of plant arm at plant…………...97.1%
takeoff toe in relation to grip……………………..26cm/10.2" under..!!!!!!!!!!!!!
takeoff toe in relationship to the back of the box... 4.09/13-5
Projected 4 and 6 step "MID" coaches mark...12.35m/40-8/16.51m/54-0
…………numbers at takeoff.. toe leaving the runway….
Horizontal Velocity of CG……………………………7.78 m/s
Vertical Velocity of CG……………………………....2.38 m/s
Resultant Velocity of CG…………………………..8.14 m/s
Takeoff angle…………………………………………17.0degrees
Pole bend %…………………………………….…….2.1%
Takeoff toe in relation to top grip……………...……. 10cm/ 4.3”
Pole angle just as toe leaves the runway………….…..30.4 degrees
Impluse.. duration of takeoff foot contact……………..0.12sec
Maximum bend…………………………………….…28.0%
Minimum effective pole length……………………3.57m/11’8.4”
Angle of pole cord to vertical at maximum bend…62degrees
Time of max bend after Takeoff……………………...0.48sec
Total time of jump……………………………………1.50sec
…………………………………………………………………………………………………………………………………………………………….
I suspect Bubka could have been at 17.00m/55-4 ... or ? 17.16/56.. but 57'/17.47m would add 4 inches/10cm per stride making each 2.17m/7'2" before he had to "cut" to 2.07/6-10... a 58 .. six step would add 7 more cm/3 additional inches per the last 4 strides...
Tully's numbers i am aware of... he was at 54-2ish.. and should have been at 55'2 plus.. he was running well, had to back off and got slammed under..
This video shows him with a coaches mark at around56-2, with a tailwind... his posture, speed and impulse were going in the right direction.... he was on his way to "feeling' and understanding how it worked...
http://www.youtube.com/watch?v=uA7Dapjsh9A Tully said; "when i do it right i feel like i "chop" without backing off and i'm 3 to 4 inches out. When that happens i know i had better swing like H**** to catch up with the pole or i'm going to go over the back of the pit"... his words.
I don't see any of today's vaulters with 57'-58' or even 59' marks that are running 9.50 mps or higher,
That indicates stretching... which continues to cause the issues we are trying to correct...
To jump "like" Bubka you need to be as close as possible to his "physics"... all of it not pick and choose what part you want to "copy"...
The vault is 90% run and starts with the first step.
dj
PS.. for those that want the approximate... 4 step numbers.........
16.54m/54 = 40-8
16.85m/55 = 41-4
17.16m/56 = 42-0
17.47m/57 = 42-8
17.78m/58 = 43-4
18.09m/59 = 44-0