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Golf After Market Shafts AskGolfGuru AskGolfGuru Subscribe Subscribed Unsubscribe 47,644 47K Loading. Loading. Working. Titleist 910 Driver With Rory McIIroy's Golf Shaft - Duration: 5:59. Mark Crossfield 136,799 views 5:59 Extra Stiff Shaft Vs.
Lessons from Shaft. Lab. Lessons from. Shaft. Lab - 3. Lessons. The. previous page presented a few "myth killers" about shaft behavior. Now. let's look at a few more assertions and see which ones stand up to the. Shaft. Lab..(5). "Kick velocity" exists and can be. The last thing we talked about on the previous page.
Changing. flex does not change clubhead speed, and. Kick. velocity increases clubhead speed.
Our golf shaft buying guide provides advice on everything you need to know when buying a steel or graphite golf shaft. The shaft of the golf club is often ignored when it comes to performance, but it is the engine of the golf club. The length, flex, torque, kick-point. Lessons from ShaftLab - 3 Lessons from the data The previous page presented a few 'myth killers' about shaft behavior. the 'inertial framework' does not rotate with the golf club. So toe-up bend at the beginning of the downswing corresponds to lag when you. Loft and lie of a golf club. The shaft is a tapered tube made of metal (usually steel) or carbon fiber composite (referred to as graphite. for a driver shaft), allowing for lighter clubs that can be swung at greater speed. Beginning in the late 1990s, custom shafts. Shafts for Less at Golfsmith.com. The largest selection and lowest prices on Shafts from the biggest brands in golf. Golfsmith Gift Cards Convenient, affordable, and always the right golf gift! Give a Gift Card Golfsmith Credit Cards Special Financing Available!
It is possible. to deduce the value of kick velocity from the output graph. Shaft. Lab. Consider: Velocity, by its.
Lead- lag. deflection is a position. The rate at which it changes over time is the. And. that - - again by definition - - is kick velocity.
We. can measure the rate of change of lead- lag deflection from the graph. Let's look again at Peter Jacobsen's swing. The. of the deflection curve is its rate of change over time. Let's see how. fast the lead deflection is increasing at the moment of impact - -. I. have drawn in red a line that is tangent to the lead- lag curve where. Because it is tangent, the slope of that line is equal. We can find the slope of the line by taking.
For instance, the line segment shown has. If we divide 6. 3" by .
Yes, that's a slope - - but inches per. You can convert it to miles per hour by. Do that and you get 1. So. Peter Jacobsen's driver kick velocity is 1. That's not a lot. He isn't getting enough kick velocity to have much effect on his.
But is 1. 9mph. a typical kick velocity? In Weathers' article, he.
I guess I can believe that. I suspect efficient swings have lower kick velocities. Because I went through the calculation for all nine pro swings that. True. Temper included with the 1. Shaft. Lab package. Here is the result. The driver kick velocities.
Corey Pavin) to almost 6mph (Davis Love. III). The 5- iron kick velocities were always lower than those of the. But they generally tracked; golfers with higher driver kick.
Yes. the bigger hitters did tend to have higher kick velocities. But even. the biggest hitters in the sample (Norman, Palmer, and Love) had kick. True. Temper's. what about the apparent contradiction: changing flex doesn't change. Now we know that kick velocity.
If changing the flex scales up. So changing the slope does affect the kick velocity. Let's go back to the article and. How. can you increase your kick velocity? A change in shafts isn't the. Although most of the players we tested had higher kick. That tells me two things: Our.
Increasing the shaft flex does increase the. It's possible - - even likely - - that. How. can that be? How could kick velocity occur and not. The way this could come about is if kick velocity.
Your 1. 00mph clubhead speed may come from: An. A. 1. 0mph kick velocity, and enough resistance at the grip so the hands are. This. may sound a bit odd. But conservation of energy and momentum frequently. And it would explain the observations from.
True. Temper's test lab. Added in 2. 01. 6. It has been almost ten years since I wrote this article, and more than. True. Temper published the findings on which it is based. In. the intervening time, there has been a lot of work by biomechanists.
This work tends to confirm. For the rest of our lessons, it. X- Y. version of the graph, instead of the deflection- time graph that Shaft. Lab. outputs. I have created X- Y plots not only for Peter Jacobsen (we saw. Greg Norman and Davis Love. You can click on the image to get a larger view. Yes. they look somewhat different at first glance.
And that isn't too. Love's swing is a. Norman's swing has very little letup in the.
Jacobsen's. also has almost no letup; but the second peak is so much bigger that it. But the similarities are also. They all start close to the. They. all experience the maximum bend in the toe- up/lag quadrant, at about 8. They all wander through. Once. the downswing is under.
Now. let's get back to the "lessons", and see what the X- Y plots teach us. Biggest bend is a little off toe- up. This is the assertion in Weathers' article. He says,"For. nearly all players, toe- up bend is far greater than any other bend. It peaks for most players somewhere near the middle. When we look at the X- Y plots we see he is close to correct. The observable facts are: At the start of the downswing, the bend is in a generally toe- up direction.
It. stays in that direction for roughly half the downswing. A little less. for Norman, and substantially more for Love and Jacobsen.) During most. This bend probably affects. The. peak bend occurs well after the middle of the downswing - - in fact. By that time, the club has started to rotate. I would restate this lesson as, "The biggest bend occurs split between toe- up bend and lag bend, with about 8. At impact, everybody has.
Certainly. all the pros in the sample did. And I have never seen a Shaft. Lab trace that. showed anything but lead at impact - - and, of course, toe down bend. And Weathers' article states that, in. True. Temper study, "Nearly all players, including pros, contact the ball with the shaft in the lead position."Most experienced clubfitters and club engineers agree. For instance, see Tom Wishon's take on the subject.(8) Bend. CG/centrifugal "pull".
I. have seen a number of respected experts argue that the bend at impact. CG). Two of. the several places I have seen this assertion are: Tom Wishon's book "Common Sense Clubfitting" (2.
Werner and Greig's book "How Golf Clubs Really Work and How to Optimize Their Designs" (2. So. is this assertion true? Well, it is true that. CG of the clubhead away from the. Not only that, it will bend into the. But we. need to be more precise if we are to agree that bend at impact is due. Let's ask ourselves what the bend would be at.
At impact, the X- Y plot would show a leading and. CG. That is the direction of the CG, so it must also be the direction of the bend. Its magnitude would depend. Since Shaft. Lab has only one design of. For that driver, the line from hosel to CG is 1.
The same is true for the 5- iron, but on a 1. The graph shows what the scatter plot should. CG- pull accounts for all. The bigger hitters should show up farther from the. What. do we actually see when we plot the impact bend of a bunch of. Here are the graphs for the nine pros whose.
Shaftlab profiles are in the 1. Not. a single point is on the CG line. Every one of the golfers not only has. CG- pull. (If you want to see what you can make of the numbers, here is the raw data.)So something is going on besides. CG- pull. That something can be best described as. CG. in every data point we have.
Note on the geometry: Recall that the the club's lead- lag and toe- heel planes rotate 9. The way physics works, the swing plane is the way.
So toe- up bend at the beginning of the downswing. Therefore, rebound from that lag would be lead. Again in this. context: I have seen some say that toe droop is "rebound" from (or.
This would be true if. But it doesn't. In. CG accounts for. all the bend at impact does not agree with the data.
So it must not be. Frequency. is a proxy for flex, nothing more. Occasionally. I see someone argue that the frequency of the shaft represents the. Of course, a. sine- wave free response does not model the entire downswing. Not only. are the Shaft. Lab plots very different from that, but even the frequency.
The closest sine- wave model to the actual data would be a half- cycle of vibration. Driver shafts (with frequencies of 2. So that doesn't fly.
But there are more. So let's look at the two major competing classes of theory of how shaft behavior changes with the flex of the shaft. Magnitude scaling holds that. According to this theory, the Shaft. Lab trace would be essentially the. The graph at the right is an example of. Shaft. Lab trace under magnitude scaling.
The. solid lines are the lead- lag and the toe- heel. Shaft. Lab club. The dotted lines are the traces for a. I suspect the True. Temper engineers have done. But the rest of us don't have the opportunity without.
One cannot get a club instrumented with. Shaft. Lab. Response time scaling holds that.
Theories of this. Again. let's look at an example of how flex would affect the Shaft.
Lab trace. The most reasonable (to me, at least) of the response time scaling. Lloyd Hackman's explanation for the Fit. Chip device he. invented. It says that the shaft behaving as a spring with a. In. the picture to the right, the release point occurs at 5. From. that point on, the more flexible shaft (the dotted lines) responds.
The flex chosen has zero lead- lag bend at impact - - the ideal. Hackman. So which. I believe the data we have supports magnitude.
In other words, frequency of the shaft or the club is a nice. It doesn't say anything about how fast the shaft responds during a real. Note that I said the way the shaft bend varies, not the amount of the bend. The difference is in the graphs above.)Why do I believe this? Well, I used to believe in time- response scaling. The Club Design Notes. I wrote in the 1.
At the time this article was written, the Club Design Notes. I expect to get around to changing. Actually, the posting of this article is a prerequisite to. So, when I heard about the Fit.
Chip - - and. had an opportunity to spend an afternoon with Lloyd trying it out, I. It held a lot of appeal. The Fit. Chip depends upon the shaft behaving as a spring with a. In that. model, choosing the right shaft involves measuring the time between. A slight. oversimplification, but nothing that the argument below depends upon.)It. Shaft. Lab believe in. The notion that. the graph scales as you change the flex.
But, since all the. Shaft. Lab traces are made with the same flex shaft, they don't allow us. However, it turns out we do. Look at the earlier scatter plots.
Actual Bend at Impact. Note that every single one shows a leading bend. In fact, the lead. What. does that tell us about "free response" theories of shaft behavior? If. shaft "speed" had anything to do with frequency - - as the design of the. Fit. Chip assumes - - then the Shaft. Lab driver is considerably too.
That's because, if shaft response. The lead - - under this theory - - comes from the too- stiff. Remember. that all the Shaft.