Lead tape under right hand?

[crapula]

Has anyone tried this? Wrap it around shaft under the right hand only, builds up right hand and adds weight, appx 11" of tape and 6g. I just tried it to see how much it built it up, good amount like using 4 wraps.

Any idea what having that weight there will do? Obviously static weight goes up, swingweight goes down.

[Howard_Jones]

You added total weight, moved balance point slightly against the grip, but head weight remains the same, and the SW scale was designed to match head weight, NOT to adjust the grip side of the club.

Depending on what type of lead tape we use and how its added to the shaft, we count 1 layer in a spiral pattern to add 0.015 or the same as 1 layer of Golf standard BU tape. The only practical use of lead tape here is to tune for MBI, or equalize grip weight or even out total weight progression, NEVER to adjust SW values, unless we make our self a CW weighted shaft this way, but for that last example to work, we have to start out from a shaft equally lighter than the weight we add.

[crapula]

Sorry, i'm confused. I know static goes up and SW goes down (not by much). Obviously the head weight doesn't change as I didn't add or subtract any weight from the head.

 

I wrapped it around just under right hand only, maybe 3 inches of length on the shaft, 11 inches of tape and appx 6 grams weight of tape

 

What is MBI, weight progression and BU tape?

[Howard_Jones]

MBI is short for MOI Balance index (the relation ship between total wgt and head weight, or shaft and grip vs total)

its more detailed explanation for it all in post 520 in this linkhttps://forums.golfwrx.com/discussion/comment/19361723/#Comment_19361723

[crapula]

Got it, never heard of MBI. I am familiar with MOI, I've been fit by a Wishon fitter before.

[Stuart_G]

Don't worry, not very many people have. It's something someone came up with, hasn't bothered to explain very well, and never been really validated. Now, that's not saying it might not be valid or useful, just that the extent to which it might or might not be has never really been tested properly or for that matter even backed up with a well formed theory (from what I could dig up at least).

 

 

[Howard_Jones]

I agree, i just mentioned it as a reason for why someone would add lead tape under the grip. Ive done lots of testing on selected players, but never for MBI, and like all other club spec parameters, non of them makes much sense isolated, but might do in a larger picture, and like i wrote in that post im linking to in the pinned topic, we have to make sure play length is right to start with, then the clubs Total weight, then we can look at MOI values, and deeper down on that list we MIGHT check the numbers vs MBI and see if that could bring the last decimals in place. But again, i never done testing for that, but had another "angle" who seems to be the same before i knew about MBI and what it was. On this board there is a few that seems to be convinced that this does make a difference.

This was my approach to it all, simple math where we get to see how each component contributes as part of Total weight, here with examples of 3 different grip weights and 5 different shaft weight, all using "standard head weight". MBI is the same concept as i understand it, the idea is that we have "2 sides" of a club, Head side vs shaft and grip side, and if we want to make our set to feel the same, we have to take it one step further than MOI, and make head or shaft and grip side equal as % of the clubs total weight, and that means Ascending weight shafts, or manipulation of shaft/grip weight.

The chart comes from the club making classes i was running in Denmark so HOVED = HEAD, the other names and specs should be strait forward. Pay attention to what the head weight thats the same for all, changes as % of total depending on Shaft and grip choice, and the lead tape we might use under the grip is to "tune" that factor so it becomes equal for all. thats MBI. (same head % of total for all clubs in the set)

Like mentioned, Isolated MBI makes no sense, just look at DG X100 with a standard grip vs XP 95 with Jumbo. By adding 2 grams to the grip, both clubs would get the same Total and MBI, but since the shaft weight and BP of the clubs is VERY different, they will NOT feel the same, so isolated, MBI cant do it, but im open to the possibilities it might improve something in a set where all the rest is "made right" and we move on to MBI as the last tune up. Ill try that on the first occasion i get.

[crapula]

Yeah guess so. Feels interesting having extra weight and size under right hand.

More wondering if it would mess up the shaft.

[Stuart_G]

@Howard_Jones said "but im open to the possibilities it might improve something in a set where all the rest is "made right" and we move on to MBI as the last tune up. Ill try that on the first occasion i get."
As I said, I'm open to the possibility. But the part about it that bothers me the most is that what it's calculating has nothing to do with the dynamics of swinging the club. It's almost like it's trying to be a poor (and inaccurate) approximation of the centrifugal contribution of the club for the release (sort of like how SW is a poor approximation of the MOI of the club). But why would anyone use such a poor approximation when the actual value is so easy to compute? I can understand the need for simplification of the MOI calcs, but not this.