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Originally Posted by niceguy  Decreasing arrow point weight will NOT change the spine of the arrow.
Not so Marcus. Adding weight at the front or back of an arrow changes it's dynamic spine and it will act stiffer or weaker. A longer pile insert also changes the effective shaft length as you say but the weight has a major effect also. I have done this many times and the effect of 20 grains can be significant. I recently brought my daughters arrows into tune with a simple change of pile weight. |
Rubbish.
How did you measure the tune of the bow? Or is this more recurve stuff in the wrong section again?
With a recurve you can move the bareshaft location by changing the spoint wieght, but you have not adjusted the spine in doing so.
Dynamic spine doesn't exist. Only actual spine and resonant frequency.
here is a quote from James Park on it
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An aside:
We don't actually adjust the arrow's spine by changing the point weight. The 'spine' is how much the arrow flexes with a certain span and weight and depends upon the shaft stiffness. Changing the point weight does not change this. What it changes is how fast the arrow flexes (but only by a small amount).
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