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Do these numbers semm possible?

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mikefjohnson

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My apologies if this is in the wrong forum.

I am 99% positive I have negative AOA with my driver, thus my whopping 4500 backspin number! That big said, I thought a negative AOA should lower the loft of the driver, so is it possible to have such high spin, a neg AOA, and a launch of 18 degs? My drives fly high and look good but fall out of the sky with no roll, so my high spin is confirmed and I would say so is my launch angle. But again, shouldn't I have a launch lower than my drivers launch (7.5) with a neg AOA?

thanks
 
I think a negative angle of attack means you're hitting down on it, which would cause backspin. Someone please correct me if I'm wrong.
 
mikefjohnson said:
My apologies if this is in the wrong forum.

I am 99% positive I have negative AOA with my driver, thus my whopping 4500 backspin number! That big said, I thought a negative AOA should lower the loft of the driver, so is it possible to have such high spin, a neg AOA, and a launch of 18 degs? My drives fly high and look good but fall out of the sky with no roll, so my high spin is confirmed and I would say so is my launch angle. But again, shouldn't I have a launch lower than my drivers launch (7.5) with a neg AOA?

thanks
Click to expand...

May be possible - you could have an extreme flip at impact (monitors measure angle of attack just before impact) which could account for the spin and launch - although that would be pretty extreme. You must be coming into it really steeply?
 
Sounds about right to me if you go to a lower lofted driver it will reduce effective loft at impact you might want to think about a swing change to get the AOA positive or at least neural
 
There are a couple other factors that attribute to launch angle

1) where you hit on the club face
2) shaft (dynamic loft)

Regards to #2, if your shaft head is kicking early then you are going to hit the ball with more loft then is stamped at the bottom of your driver

With regards to #1,impact higher on the face will lead to a higher launch.

That being said, 18 degrees of launch with a negative aoa and a lower lofted head does seem a bit unrealistic
 
jlukes said:
There are a couple other factors that attribute to launch angle

1) where you hit on the club face
2) shaft (dynamic loft)

Regards to #2, if your shaft head is kicking early then you are going to hit the ball with more loft then is stamped at the bottom of your driver

With regards to #1,impact higher on the face will lead to a higher launch.

That being said, 18 degrees of launch with a negative aoa and a lower lofted head does seem a bit unrealistic
Click to expand...

Exactly my thoughts. The monitor I was on did not list AOA, but I don't think I could have such high spin numbers without a negative AOA could I? I definitely know real world my spin is high, because I hit shots that look good but die once they reach their apex get literally zero release on some days.
 
Are you only saying it's a negative AoA because of ball flight and high spin numbers?
 
tgtt said:
Are you only saying it's a negative AoA because of ball flight and high spin numbers?
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yup, never confirmed via measurement. But again, what else would cause such high backspin numbers? Gotta be negative AOA, no?
 
mikefjohnson said:
yup, never confirmed via measurement. But again, what else would cause such high backspin numbers? Gotta be negative AOA, no?
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I've been on a monitor once, and I'm a hack, so take it with a grain of salt. I had a positive AoA (up to 5*) and was getting LA as high as 21 with backspin as high as 4200rpm. I haven't been back on a monitor but swing changes have helped tremendously.
 
mikefjohnson said:
yup, never confirmed via measurement. But again, what else would cause such high backspin numbers? Gotta be negative AOA, no?
Click to expand...

No, a negative AOA does not in and of itself cause high backspin numbers (but someone with a negative AOA can have swing issues that lead to high spin). Virtually every PGA Tour player has negative AOA numbers. I suspect you are steep with a flip and you are hitting high on the face.
 
bellairemi said:
No, a negative AOA does not in and of itself cause high backspin numbers (but someone with a negative AOA can have swing issues that lead to high spin). Virtually every PGA Tour player has negative AOA numbers. I suspect you are steep with a flip and you are hitting high on the face.
Click to expand...

Can you expand on this a bit? What would be some of the main contributors of higher spin if not AoA?
 
Canadan said:
Can you expand on this a bit? What would be some of the main contributors of higher spin if not AoA?
Click to expand...

Without getting too deep into the technical verbage, a glancing blow (not square contact) can be a major contributor to spin as can hitting a ball high on the clubface (due to the higher loft there). An OTT swing hit off the toe generally will have very high spin. Sometimes when people consider a negative AOA they are thinking about striking the ball low on the clubface (which can definitely cause a lot of spin).
 
High on the face = less spin due to the gear effect
 
This thread just got too nerdy for me :p
 
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