LHS, I'm going to back off giving you any more coaching advice re the bottom arm. I will try (if I can contain myself

) to restrict my comments to your unique style of driving the entire lead leg forwards after takeoff.
The reason is that you have a good coach, and he's coaching you to press with the bottom arm. While I personally think that Petrov is better, I firmly believe that having a coach that's there in person to help you day in and day out is better than ANY advice you can get from PVP. Of course, a blend of the two would be nice, but the worst thing in the world for you (or anyone else that has a good personal coach) is for you to get conflicting advice. Your personal coach must rule, IMHO. It will totally screw you up if you try to mix Petrov advice with drive vault advice. Only your personal coach can "reconcile" the various alternatives to "pure Petrov", or "pure drive vault". Don't try to do this yourself. You need to listen to your coach!
However, I will answer your questions as best as I can ...
LHSVaulterJJR wrote: i still have no idea what the flat back position is
The frames when your back is flat ... horizontal ... parallel to the runway. It's not just when your back is PERFECTLY flat. It's all the frames when your hips don't raise up at all in relation to the pole. You're more or less STUCK in this position ... RIDING the pole ... passively. If you were ACTIVE, you would simply pass thru the "flat back" position in a single frame. If you're modeling after Stevenson, look at him again, and count how many frames he's in the "flat back" position. I didn't look today, but I'm quite sure that he just passes THRU the flat back position ... in a single frame.
LHSVaulterJJR wrote: honestly i dont believe in tucking and i dont think i was in this vid... even though my coach is a tuck vaulter
If you're in the "flat back" position for 6-7 frames, then you're definitely "tucking". Not in the sense of cowboying or bringing your knees right into your chest, but certainly in the sense of a "pause and shoot". A "tuck and shoot" is really the same as a "pause and shoot". If you're pausing for 6-7 frames, then you're a tuck/shooter. Same difference. Just different words.
LHSVaulterJJR wrote: i'm pretty much just following what my coach is saying as of now. cant really mix in two different vault models right? lol
Right. As I said in my first paragraph, if the models are going to be mixed, your coach has to do it. Not me, and not you. BTW, what does he think of your exagerated lead leg style?
LHSVaulterJJR wrote: ... he jumped 18' 10" with a 4 and a half foot push off. and he was only 5'8" so he knows how to teach short guys how to vault.
I believe the 18-10, and I believe the 5-8, but I don't believe the 4-6 pushoff ... unless his name is Joe Dial ... and I know he went HIGHER than 18-10 ... and only pushed off 4-4. That's just too incredible to believe. However, anything over 3-6 is very good, so I'm sure he would have a good pushoff.
LHSVaulterJJR wrote: HOWEVER i do want to start driving my chest In as u explained... but i'm afraid im not going to do it by breaking my arm. i'm going to do it with both of my arms pushing upwards and high, but my left elbow would be facing outwards allowing my chest to drive in. If the elbow faces forwards you can't drive the chest in and you block. facing the the elbow out at the plant, while putting upwards pressure would allow my chest to drive in as tim mcmichael did in those vaults i've shown you on the previous forum
Some of what you say sounds correct, but I'm afraid I can't advise you on that, as I don't have any personal experience with the drive vault. Tim is the resident expert on PVP re that. It is exactly because of Tim's success, Joe Dial's success, your coach's success, and all the 19'+ American vaulters' success that I'm not going to stay on my soapbox and preach "the Petrov way" to any Americans that have had success with the drive vault. I'm the wrong coach for that.
Remember what I suggested re a narrower grip? Along with keeping your elbow out, this will prevent you from blocking as much ... it will let your chest come thru more. Ask your coach about this idea, but by all means, follow his advice on this idea ... not mine.
LHSVaulterJJR wrote: high arms, elbow out, chest drive, big swing initiated by and strengthened by a row, hips high above shoulders at invert, explosive kip, pull, turn at the top
Sounds OK. Well, maybe not the row ... OK ... time for me to be quiet and let your coach do the coaching. You're actually VERY, VERY lucky to have an 18-10 vaulter as a coach! There's hardly any vaulters of that caliber coaching in high schools, so count your lucky stars! Like I said ... having a good coach ... regardless of his technique or model ... is better than having no coach at all and having to learn to vault on your own.
Kirk