looking for a better understanding of MPF and my issue is this, I have two sets of irons at this time Apex CF 16 and Steelhead XR both from 2016 I believe. The Steelheads have an MPF of 967 and the Apex MPF is 349 so it would be my understanding that these sets would play vastly different but for me they do not. Visually there is a slight difference in the top line and sole widths and about a quarter of an inch in blade length, the amount of offset is identical and the lofts are very close, so having said all that can someone please explain the huge difference in the ratings to me. thanks in advance, Confused
Great explanation from Rlafoone. The C-dimension difference is huge, really, and does (in my opinion, and as I look at the two irons) present a different look. The C-dim in combination with the large difference in vertical cg (.744 to .864 is a lot) is why the there is a big difference in the playability rating. The C-dim and the actual vertical cg are the key measurements in the MPF formula. Like Rlafoone stated, if you hit them both in the center of the face, you probably will not notice any difference in performance. On the mishits, if you really analyzed them, I bet you would notice a difference.
Two big factors:
Actual VCOG (vertical Center of Gravity) for the Steelhead is .744 vs .864 Apex. This points the VCOG of the Apex above the center of the golf ball essentially making it harder to get up in the air. the steelhead VCOG is well below the center of the ball.
The C Dimension essentially the horizontal centerline from the center of the hosel to the VCOG, the longer the better as it provides a more stable head (forgiving). The C Dimension of the Steelhead is 1.641 which is appreciably more than the Apex at 1.2+
I would think if your a good striker of the ball, you could play either one well. In essence the Steelhead would be more forgiving on mishits.