jgripp81, on 09 January 2013 - 11:08 AM, said:
I just had a driver MOI "fitted" and I can tell its still not even close to feeling like the driver it was supossed to match (plus i saw the scale and I was over 100kg/cm2 less). Yesterday testing it out my adams adaptor broke in less than 20 swings. So now that I am going to have to get work done again I was curious how much weight and if needed, tipping ill need to have done to make up for the 100+ its off.
And one other question, what effects does having the grip on do to moi?
Was the person doing the work using an Auditor brand MOI measurement machine or doing from a formula and winging it? Did you see the MOI measurement of the driver being used as the benchmark for MOI matching?
We talk mostly in g/cm2 for MOI not kg/cm2, but the conversion is easy. Without question, MOI is a very custom aspect of fitting. For each golfer there is an MOI for their woods and then for their irons that matches best with their natural sense of tempo, timing, transition force, downswing aggressiveness so as to allow them to be a little more consistent in their swing timing and rhythm. Most male golfers end up with a driver MOI somewhere between 2700 and 2850 g/cm2 - please understand that there are always exceptions above and below this basic range.
To miss an MOI by 1000 g/cm2 is a pretty big error. I can't imagine a clubmaker who has the Auditor machine and has done even a handful of MOI match builds would miss a target MOI by this much.
Adding or removing weight in the grip end of the club has very little effect on the MOI of the club - yes it does change it but not at all by as much as weight increases/decreases in the weight in the head. And not even close to how much the MOI is changed by changes in length. But if you are talking about the MOI of the club with the grip on vs off, that's much more significant for sure because most grips weigh in the area of 50 grams or so.
The reason that weight change in the grip has the least effect on full club MOI is because the axis of rotation about which the Auditor MOI machine works is the wrist-c o c k release. So that means the grip is the closest to this wrist-c o c k axis of rotation and as such weight changes that are closer to the axis of rotation for the MOI have the least effect on the MOI.
Hope this helps a little,