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Inertia Effect.
- Master - (Changed
- 05/09/2008)
During the back swing movement the rotational movement of the
shoulder/arms-unit basically "push" the arms to the end
of the back swing movement and therefore there is no inertia effect
upon the arms during the back swing movement.
However by keeping the arms totally passive to the movement
of the shoulders, as you transfer the weight of your body onto the
left leg in order to begin the down swing movement, the "inertia
effect" comes into full effect.
For example, as you begin to aggressively rotate the hips in
an anti-clockwise motion thus literally forcing the compact upper
body to rotate around the central core of the spine, there is a
slight delay before the passive arms begin to move and unless action
is taken, the arms will continue to lag behind the rotational movement
of the compact upper body unit to the completion of the golf swing
movement.
Therefore in order to counteract this inertia effect, at some
point in the down swing movement the golfer must use the muscles
of the left shoulder to pull the passive arms into the contact area
thereby causing the arms to move independently of the shoulders
in order to counteract the inertia effect upon the arms.
However as soon as the shoulders return to the original address
position, the shoulders must stop rotating, albeit for only a nanosecond
whilst the left shoulder muscles pull the passive arms into the
contact area so that the club head makes contact with the ball whilst
the shoulders are parallel to the target line.
Therefore it is the "inertia effect" on the golf club
which enables the very good golfer to use a combination of the rotational
movement of the compact upper body unit and the correct use of the
left shoulder muscles to achieve the maximum velocity of the clubhead
as it moves into and through the contact area.
It is important to understand that the "inertia effect"
is hardly detectable within the golf swing, but nevertheless it
is still an important factor to take into account, because regardless
of how firmly you hold the compact upper body unit together, as
long as you keep the arms passive to the movement of the shoulders,
the "inertia effect" will always be present.
Clubhead.
This "inertia effect" becomes even more important
when you apply the principle to the actual clubhead.
When you are using the shorter irons such as the pitching wedge
or the sand iron, the delay caused by the "inertia effect"
before the clubhead catches up with the hands at the impact position
is very small, so only a small adjustment to the rotational speed
of the shoulders are required in order to correctly time the strike.
However as you start to use longer irons, such as the five
or six irons, the shafts also become longer, which means that due
to the "inertia effect", the delay time increases even
further before the clubhead can catch up with the hands at the impact
position. Subsequently you have to slow down the rotational speed
of the shoulders to compensate.
Finally, when you are using the longest club, the driver, the
delay caused by the "inertia effect", will have increased
even further before the clubhead can catch up with the hands at
the impact position, therefore it requires that the rotational movement
of the shoulders is slowed down even further.
So it is very important when making the down swing, that as
the club shafts become longer, you must take into consideration
the "inertia effect" in order to compensate for the extended
time delay, therefore it is vital that you slow down the rotational
speed of the shoulders accordingly.
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