Upshaw says there are three main keys to getting the right shafts:
- Fit the flex to the clubhead speed at impact.
- Fit the shaft weight to the downswing tempo.
- Fit the bending profile to the wrist release point.
Obviously, a faster downswing requires a stiffer shaft flex -- at least, it does with a modern swing. A classic swing is a different animal altogether but I doubt many of you swing like Bobby Jones or Harry Vardon.
And although he doesn't say, I'm guessing that the bending profile (the third key) refers to the kick point height and that the faster your downswing is, the higher your kick point should be. (The kick point as where your shaft bends the most during your swing. A shaft with a low kick point is more flexible down near the club head. Low kick points make the ball fly higher. Faster swings create more spin, which means the ball flies higher anyway, so fast swingers often prefer a higher kick point.)
While it's not a lot of info, it should at least give you a place to start when you shop for new clubs. It always helps when you have some idea what your clubfitter is talking about!
Take a look at US patent 8,864,598 (http://www.freepatentsonline.com/8864598.html). It not only gives more qualitative methods for selecting the right shaft but also talks about shaft loading during the downswing -- the more classic swing technique.
ReplyDeleteThanks, Jean Luc. I downloaded the PDF -- I'll have to see what I can learn from it.
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