Petrov Model vs. Lavillenie Model

[PVDaddy]

My thought is Kirk McBride has always been a wanna be.

[willrieffer]

I have clarified my position on the value of the potential energy value and curves in vaulting. This sets goals for any and all "techniques".

SInce this thread we've had Mondo take over. Doesn't take off like Bubka, doesn't swing like Bubka, doesn't exit the pole with the body technique of Bubka. So, yeah. He's routinely under. His 6.05m EC jump I have him at like a foot and a half under. So all that stuff that is at the center of the PB model, 'if you don't jump like Bubka you're losing energy' us just bunk. The commonality of Bubka and Mondo is that Mondo clears 6.2xm by a foot where Bubka cleared 6.0xm by a foot.

Bubka 10.0m/s, Lavillenie 10.0m/s, and Mondo up to 10.2m/s. And in Ke = 1/2 m velocity squared a little bit gets compounded in the square.

Per my analysis Lavillenie did everything I suggest. Punch at plant to help keep the center of mass from pendulum swinging forward and UP! His leg movements, dropping the lead leg and reaching the trail leg back work in tandem to move his center of mass down and back. He has a truncated swing where he swings a little but then rolls up into a tuck. Because swinging is simple a means to and end, that is getting the vaulters center of mass aligned with the vertical line of gravity through the top hand. The tuck also keeps the center of mass lower than Bukba's "open swing" thus conserving velocity, and also allowing the vaulter to put more work into the vault later with the 'kip up' pull through that's going to displace the vaulters com faster eg providing more work energy.

It's notable Mondo follows this model more than the PB.

Sean Francis's masters was to prove the PB model, through statistical analysis he found the opposite. That's good science.

Is Bubka's vault a bad way to vault? Not at all. It's actually easier than the ones these other two guys use. His deep body arch and trail leg reach? His com with this is back behind him outside of his body on the backside. That's driving the pole. "Staying behind the pole". You can't teach a beginner to do a quasi double leg as there isn't time to allow it. You're taking off 6' or 8' from the box you gotta go up fast! At 12' plus you gotta wait and drive the pole forward. The record that will never be broken, Mondo's U10, is a pretty normal vault, not the one he does now. He's still under!

The whole flex revolution was predicated on the fact that flex poles allowed a lower potential energy curve over straight poles. Lower gave rise to higher! Now vaulters reached near the plane of the crossbar (thus the need for "penetration" to generate a high skinny parabola over the bar) with the pole returning vertical thrust energy. It would seem you would want to maximize that. So why jump at takeoff? That was a necessity of strait pole vaulting! Yes, it reduces the pole braking force. And you can pair any technique with a corresponding pole. You want a big pole holding a lot of energy.

When my kids learn to punch and hold their com back they always immediately go through a lot of poles. And jump higher.

PV Daddy gets it. Tim McMicheal.

The human body as such is isomorphic. The physics goals I've laid out are fixed. But any number of body positions will achieve similar results.

Will