Now I know it is bad to be a 'namedropper' but I must make the point that Bubka himself believed that it was his TECHNICAL MODEL, not his physical capacities - great those those obviously were - which enabled him to jump high. In 2002 at the European Championships in Munich I stood alongside him , and with Vitally Petrov standing on the other side, asked him a direct question about this. Sergey immediately responded by saying that there were several athletes in the competition we were watching at the time with equal or superior qualities to his, and that in the US in particular there were many more.
So in a nutshell what was/is the difference between what he tried to do and what most other vaulters try to do. The best way for me to TRY to explain it is with a less than perfect analogy. It is that while he used a multi stage rocket, many other vaulters use only a single stage. The latter believe -and if many of the posts on this forum are to be heeded there are certainly many in the US who believe this - that runway velocity is the key - that if you can run fast you can hit the pole with great energy and that will enable you to jump high. They appear to believe that the rest of the vault is simply about conserving and using that initial energy. That is the single stage approach to vaulting.
As agapit and I have suggested, Bubka's technique was like a multistage rocket where energy was put into the pole continuously through the vault. Of course the run and take off was the most powerful stage, just as it is in a Saturn Rocket, but just like that rocket, other stages fired in succession to maintain the thrust.
So in the Petrov/Bubka model the whipping swing of the left leg added enormous energy, as did the third stage as he dropped the shoulders and drove the hips; finally in the fourth stage he finished the energy input as he pushed off the pole. Each successive stage was less powerful but still significant. This is why he could jump on a 5.20/10.5 flex pole -AND he could attack the take off KNOWING that he could continue to put energy into the pole so he would land safely. Those two factors of course interrelate. The more confident you are the more you will attack the take off and the more likely you will roll that big pole forward.
Anyway this is just an attempt to ask folk to look again at this technical
model. I have put up a more detailed paper on - beginnertobubka.com titled "Bubka. Unique - or a generic technical model'? It has some diagrams which may better explain the four stage concept.
On the topic of approach speeds I believe that Paul Burgess jumped 6.00 metres running at around/ under 9.3m/s and Steve Hooker jumped 5.87 at aound 9.00m/sec. I will try to confirm these figures as soon as I can.
"It was my technique which was responsible for my success". Sergey Bubka 2002
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