Here's more info. He filled out Todd's form through my web site for
LM validation. Todd thought the carry info was a misprint (207 vs.
270).
He's already using a low loft/stiff flex shaft (which you couldn't
have known from the first post) leading me to believe it's a swing
problem (or a screwed up LM).
Driver_loft_shaft = Taylor Made R7 super quad, 9.5, stock stiff shaft
Ball_Speed = 142
Launch_Angle = 17.4
SPIN = ~4800
Carry = ~270
Roll = ~5
LM_Source = April 4th, Golf Galaxy
John
At 08:22 AM 4/7/2007, [EMAIL PROTECTED] wrote:
A recent example was a guy with a LA of 17.4 and spin of 4,800 and
I'd be stealing from him if I sold him a shaft with the idea that
he could reduce his LA and spin rate without changing his swing.
What sort of swing fault would tend to produce these sorts of
numbers and do you have advise on correcting?
John,
You didn't say anything about ball speed or clubhead speed. It's
hard to say much without knowing this. Yes, 4800rpm is too much spin
for almost any ball speed. But what is causing the problem and how
to solve it will vary depending on the ball speed producing those
numbers.
Let's take an example. Suppose, in addition to what you've already told me:
___* The guy is getting a ball speed of 140mph. That's a
bigger-than-average hitter, but still not a big hitter. (We're
talking real numbers here, not ego-inflated numbers.)
___* He's hitting the ball near the sweet spot to get those numbers
-- whatever the sweet spot for that club is. (If he's hitting the
ball off-center, THAT is the thing you have to work on first.)
___* We're talking "normal" 200g driver head weight.
For those launch conditions, I get impact conditions that tell me two things:
(1) He's already got an upwards angle of attack of 2.6 degrees.
That's actually pretty high. I would NOT want to cure that for a
driver swing if he's hitting the sweet spot; that's actually a
low-spin swing. (Though, if he uses the same swing for irons, he
hits a lot of tops or fats.)
(2) He's got an "effective loft" at impact of almost 18 degrees.
That's a combination of the loft built into the clubhead and the
forward bend of the shaft. That's what would be needed to produce
the spin we're talking about at 140mph ball speed.
SO THIS IS AN EQUIPMENT PROBLEM. (Given my assumptions about the
rest of the numbers.) There's about 30 yards more of carry, and also
more bounce and roll, to be had by getting the effective loft down.
- Lower-loft head.
- Less face roll (that is, higher radius). This could help if he's
hitting it high on the face, because there is a shocking difference
in loft between high and low on-face strikes.
- Lower-launch shaft (probably more tip-stiff profile).
I haven't seen him swing, so I don't know if the assumptions are
right. That's why fitting should be done in person, not by email or
computer. But a computer can sure help.
WHICH BRINGS ME TO...
If you are a user of the Wishon/GolfMechanix trajectory
software, please email me off-list. Thanks.
Cheers!
DaveT
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By the way, I send out weekly info on new golf equipment called The
Clubmaker Report, would you like me to add your email address to it?
Send me a quick note if yes.
Thanks!
John Muir
skype: jhmuir
AIM: [EMAIL PROTECTED]
810.923.7396
http://clubmaker-online.com
http://gripscience.com
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