Game Improvement Irons Aren’t Workable – Golf Myths Unplugged

…Or Are They?

We recently debunked the idea that blades are easy to hit, and today we’re after the other half of the blade-players’ rationale: shaping shots is only possible with blades.  You hear this idea everywhere from the clubhouse bar to the online forums to the PGA Tour broadcasts, so we put it to the test to bring you the facts.

The Myth

Game Improvement Irons Aren’t Workable

How We Tested

For this test, we brought together seven golfers.  Each one hit three irons – a blade, a players cavity back, and a super game improvement iron.  All irons were tested using the same shaft and were set to the same loft, lie, and swing weight.  Each player hit ten shots with each iron.  For this test, we only used the data from “pure” shots as determined by both impact tape and Trackman smash factor readings.

All testing was done at and with the help of Club Champion.

The Results

Before discussing the details of our findings, I want to be clear about what we were testing.  We wanted to find out if blades curved the ball more than GI or SGI irons relative to the face-to-path relationship.  As stated above, we only looked at shots struck in the center of the club face so as to minimize the impact of gear effect on our findings.

With that said, this myth is busted.  For every degree of face-to-path variance, the blade curved the ball 7.2 feet.  For the cavity back iron that number was 7.3 feet, and it was 6 feet for the SGI iron.  In short, no matter what kind of iron you’re swinging, the ball will curve when your club face deviates from your club path.

For those that would quibble about the difference between 7.2 and 6, I want to emphasize what an incredibly small difference we’re talking about.  Most people consider a functional face-to-path difference to be no more than 3 degrees.  With that in mind, you’d be claiming that the SGI iron is “unworkable” because its shot lands 3 feet or less from where the blade’s does.

Other Considerations

While the data clearly shows that you can shape shots with an SGI iron, there are two other things to be considered when thinking about shot shaping.

First, you need to play an iron that allows you to manage the club face and face-to-path relationship.  Most of our testers use players irons, and that showed in the data.  We saw larger face-to-path variances with the SGI iron and poorer club face control in general.  This speaks to the importance of personal preference in club fitting.  Some players will manage a blade very well.  Others will create much better face-to-path relationships with a larger iron.  It’s important to find what works for you, and equally important to remember that just because something doesn’t work for you doesn’t mean it won’t work for others.

The other is controlling trajectory.  It is entirely reasonable to think that it is be harder to hit low shots with a club that has a very low CoG as most SGI irons do.  If flighting shots is an important part of your game, you may want to avoid wide-soled clubs with low centers of gravity.


It is our hope that our findings give you the freedom to choose the irons that will help you play your best.  You do not need to sacrifice forgiveness to shape shots – you just need to manage the face-to-path relationship.  The next time you’re changing our your irons, work with a qualified club fitter and trust the data, not the myths.

Matt Saternus


  1. I think this is a little bit beside the point. Hit any club with a shut or open face and it will curve. I think what makes the difference between a blade and an SGI iron with regard to working the ball is the turf interaction from the shape of the sole of the iron. SGI irons have big wide soles with more bounce to help correct fat shots. Blades have thin soles. If you’re hitting a shot with a shut or open face the heel or toe of the sole will hit the turf first. An SGI iron will want to “bounce” back to square as it hits the turf. That makes it tougher to get to impact with the face open or shut. Yes, if you get to impact with a shut face, the ball will curve. What makes an SGI iron tougher to curve happens before you get to that point, so you’re not testing for it. Myth not busted.

    • Matt Saternus


      If you can’t manage sole/turf interaction while opening or closing the face 1-3 degrees, that’s your swing, not the club. There is an element of personal preference and how a club works for your swing, but I addressed that in the article and it has nothing to do with the ability of the club to curve the ball.

      Also the idea that the club will somehow “bounce back to square” is nonsense. If you dig the toe, the face will end up more open at impact. If you dig the heel, it will end up more closed.


  2. You said you only looked at “pure” shots and shots struck in the center of the club face.

    What are you really trying to test with that? By analyzing only pure shots that hit the center of the club face you have taken everything “game improvement” out of the equation. Are you trying to show that perimeter weighting of irons doesn’t matter on shots that are “pure” and hit on the sweet spot? Of course it doesn’t. It only matters on shots that aren’t hit on the sweet spot. Similarly, it makes no difference how wide an iron’s sole is or how much bounce it has on a perfectly struck shot. It’s when a player hits a fat shot or misses the sweet spot that those features of an SGI iron come into play and “help” a bad golfer.

    If I boil down your analysis, it says to me that shots struck perfectly on the sweet spot will obey the laws of physics and curve based on face angle and path and the elements of club design that make an iron a “game improvement iron” (e.g. perimeter weighting and fat soles) don’t matter because the shots have been struck perfectly.

    Phrased differently, if you’re a skilled player and can hit the ball purely and on the center of the club face, you can make an iron shot curve regardless of whether you’re playing a blade or an SGI. I totally agree with that. I’m a skilled enough player to be able to do that and I empirically know it’s true. But so what?

    I also empirically know that if I don’t strike the ball purely that the same miss will be very different if I’m swinging a blade or if I’m swinging an SGI iron. And I believe that difference is magnified if I’m trying to curve the ball. If I’m hitting a low draw with a blade 4-iron and I mishit it, compared to the same magnitude of mishit on the same shot with an SGI iron, I think the SGI iron will go straighter (and probably carry farther, so it’s a double edged sword).

    That’s not what you’re testing. But I think that is what you should be trying to test.

    I hope you will. Somehow. It’s obviously a tough test to design. I think the challenge may lie in figuring out which shots to include and which shots to exclude. For example, if I try to hit a draw and I manage to draw 8 balls out of 10 with a blade but only 2 balls out of 10 with an SGI iron, if I exclude all the shots that didn’t draw I will get the same data and erroneously conclude that SGI’s work the ball as well as a blade. But if I look at it by asking what percentage of all shots drew, I would come to a very different conclusion.

    I wish you luck in your testing and look forward to reading the next chapter.

    • Matt Saternus


      We were testing whether or not SGI irons curve the ball as much as blades given a centered shot and equivalent face-to-path (FtP) relationships. We stated that very clearly, tested that, and presented the results. We’re not interested in things that people “know intuitively.” Things people “know intuitively” are the things that we want to test and put data to so that they can be substantiated as facts or thrown out.

      The purpose of removing off-center hits, as I explained above, was to eliminate gear effect. No good player works the ball with irons by mishitting it.

      The test you that you’re suggesting, as I understand it, would do nothing except show how adept our testers are at managing various types of irons. All the data gathered in this test and our previous test on the forgiveness of SGI irons shows that some players can manage a small (or big) iron well, others can’t. A player may swing a blade with a functional club path and then swing the SGI iron into left field, or vice versa, regardless of what they’re trying to do.

      If you’re suggesting some kind of test where we dictate a FtP relationship and then test various degrees of mishits, that would only be possible with a robot. No human can simultaneously maintain the exact same club path, club face, FtP while manipulating strike location and changing clubs. At this time, robot testing is not something we’re interested in. Human testing is much more interesting and relevant in our opinion.



      • I agree with Matt whole heartedly here. I would also say to those who want to see this “be careful what you wish for”. In personal testing across a few different clients (no where near the scope of some of these tests) I’ve noticed that with the different types of heads it’s better to have MORE forgiveness because you’ll end up under cutting or drawing the ball but maintain distance, whereas the people who attempted to work the ball and missed ended up falling well short of the target, along with a two side miss – mostly OVER cooking the curve but occasionally too little because of the loss of energy transfer. It’s still not a robot but the results have been fairly consistent on similarly matched strikes with all kinds of irons. Very predictable.

        Muscle backs and small blade length irons can hit the ball a mile. That’s their job. Mass behind the ball equals POWER and they go a damn long way while retaining spin. Thats’ definitely a plus, but for those of us who get great spin numbers from GI irons anyway – the good news is that there’s no reason to sacrifice the distance and forgiveness for “workability” because it DOES exist. This misconception is purely mental and plays to the vanity of golfers.

  3. I think that curving the ball is the simple definition of “working the ball” and is accepted by the masses, but I don’t think it’s a correct definition. Your note regarding center of gravity is more relevant in the big picture of “workable”. Like you said, curving the ball left and right is simply a matter of face to path, but trajectory is where “workable” really makes a difference.
    I regularly hit low cuts and draws and I wouldn’t dare rely on a SGI club for this. SGI clubs are designed to fight the golfer’s natural swing flaws and help get the ball in the air.
    With all due respect (and I know this may sound arrogant) most people that make “workable” a talking point can’t even “work” the ball, and they are just referring to curving left or right. It is near impossible to hit a straight shot. 99.999999% of shots are curving one way or the other, but that doesn’t mean that everyone that slices or hooks a ball is “working” the ball. Working a ball is more a result of the players skill than the club characteristics. It takes a lot of skill, understanding of the cause and effect and practice/coaching to really be able to consistently work the ball for all shots.

    So I would say that this conclusion is a bit flawed and the result should be more focused on trajectory than curvature. And in that case it seems that blade and player irons are indeed more workable than SGI clubs. But that doesn’t mean that SGI aren’t workable, just that they are more difficult because of the intent of their design.

    • Matt Saternus


      You may want this test to be something that it isn’t, but that doesn’t mean the conclusion is flawed. We were explicit about what we were testing, how we tested, and the results that it produced. If there’s some other test you’d like to see, feel free to make a suggestion.


    • For the record, you can certainly hit low and high shots with GI irons. Whether you’re comfortable doing it or have the ability to do so is a different story, but it can be done. And difficult is a relative term. Most of the issues people have with working and flighting GI irons stem from the golfer’s ability. I wonder if it could be said that people aren’t good enough to play GI irons on the regular?

      My own experience? I trust mine to perform exactly as planned every time. Swing for swing, i love the GI irons i have over my blades. The muscle backs go a mile because of all the mass behind the ball and short blade length, but the shortcomings of them are enough to make me just want to play GI all the time. Forgiveness is nice to have even if you don’t use it all the time. Also, “difficult” is a relative term. What you find difficult may not be what others find difficult. I find it equally easy to work all types of clubs. I find it more difficult to hit perfect shots with a muscle back or muscle cavity than i do with a full cavity, GI or SGI.

      I think this test is well done and definitely hits the mark. I also think a lot of people won’t like that mark or the results.

  4. I play with GI irons. I’ve used players irons plenty. It is equally as easy to work both. However the difference is the GI irons are very difficult to control the amount of curve. Probably due to the low CG. The height makes it curve out of control.

  5. If you find yourself moaning about the results of this test, i suggest reading it again, then again, then again and again still. This information needs to be forefront in your mind when talking about golf clubs in general. It’s a HUGE misconception that a game improvement iron is going to ruin your directional golf. It’s just not true. Even with gear effect and high MOI style irons, it’s not going to be THAT bad to work them on an off-center hit – as any high handicap can tell you. I find that most people who have issues with the notion of SGI and GI workability know one way to hit a golf ball and don’t care to adjust to anything. And that’s very ok, i might add, but just because YOU find difficulty in it, doesn’t mean it’s impossible. GI irons fit me squarely. I can flight and work them left or right about 30 yards max with ease…. do you know why i don’t know if i can work more than 30 yards? Because i’ve never had to! I remember in my younger days i fell prey to this same argument — players clubs work the ball more. The longer i’ve played and the more i’ve understood ball flight and actual technology, the more it’s come into focus that it’s about ego more than anything.

    If a club doesn’t fit you, then it doesn’t fit you – there’s no shame in that. if you don’t like how something looks, or how it interacts with the turf – well that’s fine too. The fact remains that if you can’t curve or flight the ball with a GI the same as with your blades – that’s a problem with you and not the club. You swing the club, you hit the spot. Really the only thing that changes is you might fall a little short of your intended curve amount with the GI iron if you catch it off center. If you catch the same spot with the muscle back, you’re going to end up short and probably over-cook it… not really an ideal situation.

  6. I have no problem with moving a ball left and right with a GI iron. The problem I have is flighting the ball low. Maybe some of you can get this to work but I can’t. I don’t really have a need to flight my 5-6 irons and I need the help but I do want to flight the shorter irons. Thats why I combo a GI with a more blade style short iron and that works for me. This was not part of the test but the blade irons are so much more consistent out of the rough as well. The GI face seems harder for me to control out of the rough.

  7. I mostly use my left hand to play. I don’t feel any issue when play but feel having issue to maintain. May be it’s creating lot of problem for me if I play in course. I check multiple golf irons for game improvement but some of them are too heave or some of them are too light i don’t understand for maintaining balance which one iron is suitable.

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