interesting thing I read

I can't remember where I read it, but it was something with regards to weight relatoin. Saying at adress you should have the weight on your feet 50/50 (front foot/backfoot) or 40/60 fro drives and 90/10 for short chip shots.

Nothing new right, but then I read at impact pros have 25/25. (If anyone else read that and knows where please tell me so I can read that some more, think i was at the dentist and I was called up and didnt' get to finish the read) So that would mean that they only have 50% of their weight on the ground at impact meaning they almost jump at impact. I have also seen shots of tiger and others that have one or both feet off the ground at impact. Anyone know how they can "jump" at impact like that, and is that why they get such good distances? is it from a such a violent hip turn that they atually raise off the ground?

Centripetal force. The jumping is a reaction to the force we apply. At impact, a club can weigh as much as 60lbs due to centripetal force. We apply a force of at least 60lbs in the opposite direction. In this case, upward. When the club strikes the ball, it decelerates. As it does so, it weighs less. But we are still pulling it with as much force as before. We jump.

How can you have weight distribution of 25/25% ? It must be 50/50 or 60/40 or something that adds to 100.

You can have less downward force, I expect that's what they mean. If you look at pictures of these Long Driving competitions they lift off the ground at impact.

The numbers are the force each foot applies to the ground, expressed as a percentage of total body weight. Very clear, concise way to express the concept, IMO.

Only the static positions require that the sum of the foot reactions equal the total body weight (plus club weight, too).

wow thanks man, that actually makes a lot sence. I have wondered that for such a long time, and have heard other answeres before, but none that logical.


and yes brainW (for the sarcastic and/or literal readers out there), what KBP said.... 100% is the total body weight applied to the groud (i didnt' think I needed to litteraly explain that). the test was probly done on thoose scales that can tell you if the weight is on the back or front foot and how much weight. So if someone weighs 100lbs at impact the scale would only show 50lbs. Of course they didn't loose 50lbs, they just "jumped" enough so that 50lbs of weight was taken off the scale, you can try that on your home scale if you want. Push down on the counter and you can appear to weigh 10lbs less.

So where does the mass go? A lot of its got to go into the club and club head being delivered into the ball. Probably some in the arms being flung around as well.

hi
i still dont see how you can make yourself lighter, if you could the army would use it when marching over bridges, sailer would use it when sailing. no you can shift weight from one part of your body to another but you still weigh the same. try using a power ball and check your weight when its spinning real fast and your weight dont change but you do feel a weigh change in your arm, i think a power ball builds up more force than a golf club as it spins about 1500 rpm. i remember someone putting a battery powered power ball on a driver head and it ment you had to sing on plane due the the force of the ball spinning in the club head.

cheers
bill

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The vast majority of tour pros do not come off their front heels at impact, and the few that do are not known for being consistantly in the fairway off the tee. Shifting your weight off of your front heel at or around impact reduces the chance of being able to hit the ball consistantly and accurately.
I don't believe hip rotation pulls/pushes the players heels in the air. Hip rotation (not slide) from a biomechanical view point is likely to shift body weight to the heels not the opposite. Moving weight toward the toes/ball is what puts the players on their toes. You could setup in your golf posture and rock your weight to your toes (where your heels rise slightly off the ground) and conversely you could rock your weight to your heels (where you could wiggle your toes in the air).
Most of us would probably agree that not all the golf instruction out there is good or worthwhile. Much of what you read or hear isn't necessarily logically correct, nor appropriate for your game. If you're looking for a way to get more distance you're better off going with the scientifically and majority supported theories (like the X-factor stretch).


Those long drivers that fly off their heels don't play on the professional tours for a reason. They don't have the consistancy or the accuracy to compete with the tour players.

hi Avid golfer
intresting point about weight shift on the left foot and going more onto the outside of the foot nearer the toes, one of the things my open stance Trevino system does is let you shift to the out side ball of the left foot with ease, if using a closed stance it much harder to do as the timing of the hip turn is so much more important in getting that weight shift and you see a lot of player that draw the ball with a closed stance come up on both toes when the hip's dont turn enough.
cheers
bill

__________________
ping zing2 metal driver
ping zing2 metal 3 wood
ping eye2 1 iron
ping zing2 3/9 irons
ping ist 47% wedge
ping zing2 52% s/wedge
ping mb 56% wedge
ping c10 G2I broom handled putter
top flight "T" golf balls
white ping bag

Yes Avid, I agree. I was trying to show that Long drive hitters created this effect. I would not suggest that regular players attempted to replicate it.

Hey, relax. My comment was not sarcastic, more thinking aloud. Sorry if that's how you understood it.

hmmm. Guessing you didn't read my post about stepping on a scale and pushing down on the sink. though it is true you can't loose any mass, you can produce less force on the ground/scale, AKA weigh less. weight is a measurement of the gravitaional force acting on the object. Newtons 3rd law i believe is the one that speaks of eqaul but opposite... so that means if you psuh down it goes up. so if you push down on a counter or something not on the scale, that force pushes you up therefor making you weigh less. on the moon, you weigh less, you dont loose any mass, gravity just doesn't pull as hard.

the army does have the technology to "make themselves lighter" but the thing is that it requires a downward force to achieve that upward forces that "makes you lighter" so it really wouldn't accomplish anything or help them. that is how a helicopter works, it has enough upward lift that it could apear to weight only 50lbs on a scale or 1lbs ect.

when you ask someone how much you weigh, there really is no need to say "how much do you weigh when you are standing on a scale" though that is what you are asking. so yes you can weigh less very easily, it just won't be a perminent thing.



now i think what martin was saying is that due to the centrifigal force on the club head making it weigh alot more (lets say 60 lbs) than it is static (yes you can also make things lighter and heavier too) that to conteract that force you pull up with lets say 100lbs and when the club hits the ball it looses some speed therefore loosing some weight lets say only weighs 30 lbs but you are still pulling with 100lbs of force and that is why you lift up.


here is some videos

no problem man, thanks for that picture too

though i agree that most don't and it can lead to inacuracy, i do have a few tiger videos of him doing the same.

but this isn't ment to be a good player/ proper form and good accuracy discusison, i just simply was interested in how it happens and i think i got it now.

I had a post here a long time ago on this topic, but I can’t seem to find it or the material I referenced on GTO. I have attached a link – click on, in particular, The Big Launch – it tells you where the power comes from and for some, where the weight goes.


Jamesh


http://www.exn.ca/dailyplanet/view.asp?date=7/7/2006