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Date Posted: 19:49:09 07/06/00 Thu
Author: Peter
Subject: Re: Left Arm/Shaft Angle - relevance
In reply to: Phys Ed 's message, "Re: Left Arm/Shaft Angle" on 18:43:54 07/06/00 Thu

There are a few benefits of maintaining this angle longer:

1) Increased club head speed
2) Correct effective loft
3) Possibly increased spin due to better compression from #2

1) From 'The Physics of Golf' - "The main point is that an increase in the wrist-cock angle at the beginning of the downswing produces an increase in the club head speed at impact with the ball."

Though I have some issues with the model used it is important to understand that it assumes that the wrist cock angle is maintained until about the point where the hands are even with the rear leg.

If you apply a force (and you need to) to reduce the wrist cock before this point: "In the three calculations just considered, the golfer acts early in the downswing to help in the uncocking of the wrists. In each of them this action results in a decrease in the clubhead speed at impact compared with that of the standard swing."

This later point is because the force that uncocks the wrist earlier causes the increased speed to be 'spent' before impact.

More conventionally think of a whip or a flail. THe longer you maintain the bend or cock the faster the louder the crack and faster the speed when it is finally 'released'

2) when you watch a pros trajectory you will see that the ball takes off a a felatively low angle and then rises. The low angle is due to proper effective loft of the club at impact. Proper effective loft is achieved with the hand above or slightly ahead of the club head.

3) Reports are that spin is increased when the ball is compressed from being struck with a descending blow. This is also my experience. The rising trajectory in pro's shots is due to this (back)spin.

When I've been near pros playing there are two signs of this type of strike other than the ball trajectory. One is the sharp 'click' of impact (ball before divot) and then the 'shock' you feel in your feet as their club takes a divot. In my experience this shock feels completely different that the average persons 'fat' shot.

As you can see, except for Foltz (who has an incredibly long backswing) all the pros have the club at least at horizontal when the hands are even with the rear leg ("6/100s"). Next time they do a sequenc of a pro in one of the golf magazines take a look. I am certain you will see the same or more acute left arm/shaft angle at that position.

Peter

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