The wobble factor in
your score

Article by Michael Schilling, 2018

Why are coaches so concerned with core strength and
stability?

The most important technique or factor in scoring
well in archery is Core Stability. Without a solid core, an archer will need to
be very lucky to get a good score. The core is the foundation of the shot - without
a solid core there is little an archer can consistently do to overcome instability.
The core is said to be over 80% of the shot and all technique needs to be built
on top of a solid foundation.

To show how important the stability of an archer is
during the shot, I turned to maths and used trigonometry to see how many points
would be lost if an archer moved during a shot.

Considerations made in determining the points lost
included:

  • Draw length (Set to
    28” for these calculations)
  • Target face size
    (Inner zone as X not 10)
  • Distance to target
  • Arrow diameter (set to
    6mm for examples)
  • Draw length
  • Wobble by up to 10mm
    only in 1mm increments

No consideration was
given to the skill of the archer, the wind or any other excuses commonly made
for missing the middle!

The following data shows the points lost based on
the amount of movement or deviation of the archer at their draw length. The
deviation was correlated to the offset for the arrow on the target and hence
the resulting loss in score, including accounting for any line cutters.

On a 122 cm target face, the deviation, shown
across the bottom of the graph, is the amount of wobble during the shot in mm. I have more charts showing other target face
sizes if you are interested.

So, using a large-faced target and an archer
shooting at 50 metres we can see that an archer who may have been aiming at the
middle but wobbled by 9mm would not be able to score any points.

Note that the graph shows that 1mm of wobble loses
1 point, 2mm loses 2 points … 6mm loses 6 points, 7mm loses 8 points, 8mm loses
9 points and any more than that means you do not score. This is all for a
standard 6mm arrow. Comparing these losses to those for a larger arrow shows
little difference in results and certainly not enough to justify having large,
fat arrows being shot in the wind.

To not lose any points at 70 metres, an archer
cannot wobble by even 1mm.  So the World
Cup archers we watch on TV shooting 10's are very accurate and very stable in
and throughout their shot.

As one of our top recurve archers points out,
scoring 10's is easy - just point it at the middle and don’t wobble!

What can you do to score more points?

  • Be solid in the shot
  • Have a solid
    foundation on the ground (no running shoes with curved soles)
  • Release the string
    cleanly by relaxing the fingers, not opening, as this will minimise the
    plucking and movement of the string away from the face in the release
  • Stay balanced front to
    back, the push and pull should be equal so you do not move in the shot
  • Have a solid, stable
    front shoulder and relaxed bow hand
  • Keep your head still
  • Aim at the middle!

It is easier to stay solid in the shot and have a
good consistent technique to score more points than it is to be lucky or be
doing all this maths!