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Arrow tuning?

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Jakesnyder:
When shooting my stick bow I notice it shoots better with no tip on it versus with even a 70grain field point. Why is that? Arrow spine to low or too heavy?

Pat B:
Too light, I say. What type of shafting is it? Have you checked the spine? With selfbows generally the arrow spine will be about 10# lighter than the draw weight.

stuckinthemud:
Sorry Pat, fletching is a new skill to me, are you saying arrows for a 35 pound draw weight bow would need a 25lb weight to test the spine?

bownarra:
Yes for a 'normal' handle width. You would want between 5 and 10# less spine than bow weight. If using a 28 inch draw and around 100 - 125 grain points.
There are many things to factor in but this is a good starting point.

Pat B:
When you buy spined shafts the dynamic spine of the shaft is determined for a 28" arrow with a 125gr point. For each inch over or under 28" the effective spine drops or raises by 5# per inch respectively and for every 25 grs of tip weight above or below the 125gr will reduce or increase the effective spine of the arrow by about 5#. So, if you have a 30" arrow with a 150gr head and the shaft's dynamic spine is 50# that arrow will fly like a 35# spined arrow. 10# lighter because of the 2" over 28"(5# per inch= 10#) and 25grs over the 125gr standard(5# per 25gr over 125gr).
 I hope this isn't too confusing.  I draw to 26" but cut my arrows to 30". This gives me a weaker spined arrow but with a little figuring I can make the arrows fly well. I like a longer arrow because I think it gets around the bow better.

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