Lloyd, if the butt of the shaft were rigidly clamped than what you say
would be true - maximum velocity would occur when the shaft was
straight. But the shaft of a swung golf club is not rigidly clamped, it is
being held in the hands which are both moveable and soft. That being the
case the behavior of the shaft, hands, and clubhead are no longer simply
defined. The shaft is no longer in a simple mode of vibration and it would
be very difficult to make any general statements about the clubhead
velocity at a particular point in the swing. Tom Wishon, who has looked at
lots of swing videos, says that shaft bending does not significantly
contribute to clubhead velocity, and I believe him.
Consider a shaft with weights on both ends - a clubhead on one end and the
hands on the other - bow the shaft and then release it. The bowed shaft
will try and straighten, accelerating the clubhead and hands in one
direction and the shaft in the other. But the clubhead and the hands are
significantly heavier than the shaft and so have more inertia and will move
significantly less than the shaft. This is probably a more reasonable
premise for the oscillatory behavior of a swung golf club - The clubhead
and hands have relatively steady motion with the shaft oscillating between
them.
Regards,
Alan Brooks
At 07:50 PM 1/16/2006 -0500, you wrote:
Dave
So your saying a spring does not reach it peak speed when it passes though
its neutral position or when its sine wave load curve is zero?
llhack
> [Original Message]
> From: Dave Tutelman <[EMAIL PROTECTED]>
> To: <ShopTalk@mail.msen.com>
> Date: 1/16/2006 7:09:48 PM
> Subject: Re: ShopTalk: Shaft Quality and Bend Profiles
>
> At 06:18 PM 1/16/2006, Lloyd Hackman wrote:
> >My real concern is what does shaft profiling have to do with getting the
> >shaft back to straight and square. All shafts have their peak performance
> >when they are back to straight and the profile has nothing to do with
> >straight and long or anything else when the shaft is straight.So why
> >profile if we are going to fit the shafts properly to be straight at
impact.
>
> Lloyd,
> I have long disagreed with your theory that "all shafts have their
> peak performance
> when they are back to straight". If that is the fundamental premise
> of your argument, you don't convince me. And you're not going to
> convince me of that premise; we've waltzed around this block too many
times.
>
> DaveT
>
>
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