Originally posted by WUTiger
You have to understand the structure and intended use of the Maltby Playability Factor ratings. The GolfWorks team calculates the MPF using a six-variable math equation. It takes into account such things as vertical center of gravity (VCOG), rearward center of gravity (RCOG), and moment of inertia (MOI).
The MPF ratings divide clubs into six categories, from Ultra Game Improvement down through Players Classic. There's even a 7th no-go category for clubs - mostly historical - that have a negative MPF. The MPF measures the user-friendliness of clubheads. Even developer Ralph Maltby cautions that MPF tells only about clubheads, and does not factor in what type of shaft the club has.
The MPF ratings serve as a rough sorting guide, so that you can try out seven iron models you like rather than 60. ...
Originally Posted by StrayCat
So what does it all mean in terms of score? How many strokes between a players club and a GI club, or a SGI club? 2? 5? 10? I see posts on here all the time where someone will say "with your index, you can't hit a blade". Why can't they hit a blade? I hit blades for 25 years and my iron game was the best part of my game and my handicap never got to single digits.
I ask you WU because you're one of the tech guys on here and if you can't quantify the differences then I'll continue to believe that anyone can hit any club if they're willing to work on their swing mechanics.
Your game is bought at the practice range, not at Golfsmith.
Again, the MPF helps you find iron-heads designs within a given playability range. Go check the earlier posts for how I "quantify the differences."
Anyone can hit any club... not really. Just for fun, I tried to hit some Callaway X Prototypes (Ernie Els favorite) with a PX 6.0 shaft. Between the fact the shaft was way too stiff, and the head has a fairly high vertical center of gravity, I couldn't generate enough power to get the ball airborne. I need an R.flex shaft and a lower VCOG such as found in the GI range heads.
Also, if you miss to the left all the time, you might do better to make the sole tape test and find out you need the club 2* flatter on lie. That's a lot more efficient than trying to manipulate more flatness into your swing.
Your game is bought at the practice range if you get clubs at Golfsmith that are reasonable for your game.
On value of MPF rating system.
Originally Posted by iacas
I think it's quite possible to understand it and still find it pointless or useless.
You're a pro now, arrange visits to Titleist HQ, and are more familiar with different club models than the average 'Trapper. Many of us who work non-golf jobs find the MPF useful. Again, it's about trying seven iron models rather than 60.