I recently asked you a question as to which of your irons was the easiest to hit and you suggested the TS3. In comparing that iron to the one I am currently hitting I noticed that the MOI on my current iron is essentially 13.9 whereas the iron you recommended is about 11.7. Correct me if I am wrong, but isn’t MOI essentially the length of time that the ball is in contact with the club head? Is it this shorter period of time that results in a better feel?
MOI is not the amount of time the ball is in contact on the face. MOI (Moment of Inertia) is an objects resistance to twisting. MOI in an iron is determined by the mass and dimensional characteristics of the club head. Where the CG sits in relation to the horizontal cg, vertical cg and rearward cg all determine the club heads resistance to twisting. Although MOI is a factor in playability for sure, it is not as big a factor in the overall playability factor. A difference in our MPF of 13.9 vs 11.7 MOI moves the number only about 5 points.
While it is technically true that the higher the MOI the more resistance to twisting an iron will be on off center hits, the difference in the actual affect is not that great. In other words, I would not make a decision on an iron based on a 2 point variance in MOI. More importantly is the overall shape, look and feel. We make sure the dimensions in the irons we design put us in the highest playability category possible for the category or type of iron we are designing, without sacrificing an overall look that we feel will appeal to players. We focus on the horizontal cg location, the vertical cg location and the rearward cg location. When those are acceptable or and where we targeted in the design, the playability will be high. MOI will be what it will be based on those factors, and the overall weight of the head.
Britt Lindsey
Bravo … excellent reply ✔️.
‘easiest to hit’ depends on numerous specs in a clubs design… not just weight & its placement.