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The shaft is the timing device of the golf club.
It stores energy at the start of the downswing
and releases it in the impact zone. The timing
of this release varies with the speed and
technique of the swing and is controlled by
the stiffness or flex of the shaft.
The more powerful the swing and the higher
the clubhead speed, the stiffer the shaft must
be to return the clubhead to the correct position
at impact. A shaft which is too flexible will tend to
cause shots which fly higher than normal and to
the left of target. A shaft which is too stiff will
tend to produce shots which fly lower and to the
right. Both conditions will also result in some loss of
distance.
The illustrations to the right, demonstrate what happens
to a shaft during a golf swing. As the downswing begins,
energy is stored by the flex of the shaft. At impact, the
shaft has unloaded and maximum energy is
transferred into the golf ball. As the player swings
through the ball, you can see how the shaft has
released the stored energy.
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The table below determines the correct shaft flex, based on the average distance the golfer hits
a seven iron.
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| Shaft Flex |
Typical Golfer |
Average Distance (yards) |
Clubhead Speed (mph) |
| Extra Stiff |
Strong professionals |
185+ |
100+ |
| Stiff |
Most professionals, low handicap and strong amateur men |
160-185 |
90-100+ |
| Regular |
Average men. Low-handicap women |
140-160 |
75-90 |
| Senior |
Senior men and stronger women |
110-140 |
65-75 |
| Ladies |
Average women |
<110 |
<65 |
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