Clubhead acceleration at impact: creating inconsistency

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GeoffDickson

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On the other thread, Frans identified that my clubhead speed varied by 4mph over 15 swings with a 7-iron. He correctly identified that my current shafts are sub-optimal (my words, not his). I still hit with X-stiff shafts when my clubhead speed would justify a Stiff rating (at best) or perhaps a 'stiff' regular shaft. 10/10 for Frans.

My Flightscope acceleration profile indicates that my rate of acceleration is increasing SIGNIFICANTLY as I approach impact. This is also recognised as leading to inconsistencies in clubhead position/direction and club face direction. I understand that the aim is to to have your club head accelerating through the ball, but only a marginal/low level of acceleration. It's OK to have the rate of acceleration decrease, but it the rate of acceleration should never be negative.

Have I connected these dots correctly?
 
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GeoffDickson

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GeoffDickson

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My interpretation of the acceleration profiles in the above figure is that my rate of acceleration is increasing i the moments just before impact...and that is not a good thing.
 
tongzilla

tongzilla

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I never understood how to interpret and make good use of those speed and acceleration charts. Any idea of what it SHOULD look like for a tour player?
 
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GeoffDickson

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Tongzilla..let's learn together.

I am expecting to receive comments on two aspects of my acceleration profile.

1) Notice that my maxmimum acceleration is at the very beginning of the swing. I think this is bad. I think that better players will have their peak acceleration a little later in the downswing. may well be a sign that I snatch the club at the beginning and even worse, snatch the handle towards the ball. Alternatively put, I have no out-toss.

2). Note the ski jump at the end of the down swing. I think better swings will not have this 'lip'...the good ones will have just a straight line that does not cross zero. If less than zero, then the club is decelerating.

Now...over to those with more than half a clue.
 
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softconsult

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Time change has got me screwed up so I'm up very early. When I saw the first post with the 135 yd carry on a 7 iron, I just thought, well the guy doesn't hit it very far. Then I read this post and the reference to X shafts. Seems like a contradiction to me. I have no idea about the flightscope analysis stuff. My simple approach would be to go find a regular flex shaft for another 7 iron and see what it does. 135 is a really short 7 iron.
 
mgranato

mgranato

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GeoffDickson said:
Tongzilla..let's learn together.

I am expecting to receive comments on two aspects of my acceleration profile.

1) Notice that my maxmimum acceleration is at the very beginning of the swing. I think this is bad. I think that better players will have their peak acceleration a little later in the downswing. may well be a sign that I snatch the club at the beginning and even worse, snatch the handle towards the ball. Alternatively put, I have no out-toss.

2). Note the ski jump at the end of the down swing. I think better swings will not have this 'lip'...the good ones will have just a straight line that does not cross zero. If less than zero, then the club is decelerating.

Now...over to those with more than half a clue.
Click to expand...

1). The radar is collecting this data not at the beginning of the swing or at the start of the downswing, but well into the downswing. IIRC, it is picking up the clubhead between shoulder height and hip height, and then tracking it through impact. So what you are seeing as the starting location for these graphs is normal for a club gaining speed well into the downswing.

2). A lot of times you can see these "up ticks" at the end because of over swinging or wrestling with the release from ill fitting shafts. Notice the inconsistencies in the previous shots (light blue lines) during these up ticks. Ideally you would want the lines to be fairly closely shaped. How closely shaped will depend on fit, and how repetitive your swing is.

Apologies for not being able to find the large version of this graph, but here are a few drives hit by Goosen. Humbling what the right equipment and a little bit of talent graphs like. :)

ScreenShot2012-11-06at63636AM.png


A quick video from Rick touching on #2...

 
hp12c

hp12c

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mgranato said:
1). The radar is collecting this data not at the beginning of the swing or at the start of the downswing, but well into the downswing. IIRC, it is picking up the clubhead between shoulder height and hip height, and then tracking it through impact. So what you are seeing as the starting location for these graphs is normal for a club gaining speed well into the downswing.

2). A lot of times you can see these "up ticks" at the end because of over swinging or wrestling with the release from ill fitting shafts. Notice the inconsistencies in the previous shots (light blue lines) during these up ticks. Ideally you would want the lines to be fairly closely shaped. How closely shaped will depend on fit, and how repetitive your swing is.

Apologies for not being able to find the large version of this graph, but here are a few drives hit by Goosen. Humbling what the right equipment and a little bit of talent graphs like. :)

ScreenShot2012-11-06at63636AM.png


A quick video from Rick touching on #2...

Click to expand...

This place just smartens me up. Remember only use your new found powers for good. Muahahahahahahah!!!!!!:cool:
 
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softconsult

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I am focused on the election, but the chart in the last post inspired me to do a search for a Flightscope somewhere reasonably close by.
It made me recall Michael Jacobs showing me that chart during my Long Island lesson about 2 years ago. He made the comment about the shafts not being very stable after impact. At the time I was using Titleists with S300 Dynamic Golds. Now my irons are fitted Ping S56's with AWT stiff shafts. What do you know. I found a fitting center with a Flightscope in Oakridge, TN (less than 2 hours). Something to mess with over the winter.
 
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GeoffDickson

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MGranato is correct. Acceleration profile commences about half way through the downswing.

The beginning of the measurement varies based on 1) Distance of FS from golfer; 2) Height of golfer 3) Angle of set of FS

Basically the ‘beam’ is transmitted at an angle of 22 degrees from the flightscope. You need to also factor in the angle of the unit. ie 10 degrees.
 
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