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Main Boards => PowWow => Topic started by: snowplow on October 14, 2019, 10:30:20 PM

Title: Another spine question
Post by: snowplow on October 14, 2019, 10:30:20 PM

Say you have a test set.
.600/.500/.400/.350 all stock length do far
When you cut them shorter they get stiffer

Just curious is there a rule of thumb as to how much you can cut before they end up the next spine range (l guess dynamic spine)?

Say l have a .400 for instance with 200 up front at 34"

Is there a rule of thumb to ballpark figure how much would be cut off a .500 with same tip to act the same?

Thanks for the help. I hope that makes sense.



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Title: Re: Another spine question
Post by: McDave on October 15, 2019, 01:07:25 AM

I haven't tried to achieve equality of spine through cutting, but I’m sure it's possible, because cutting seems to affect spine more than weight change. That is, a 1/4” change in length will have a noticeable effect on spine, and 1/4” is about .008 of the length of the arrow.  It takes about 25 grains to have much effect on a 100 grain point, which is a 25% change in weight, by comparison.

I like to keep arrow length the same, for aiming purposes, but I will sometimes change weight if I want to use the same bow for target and hunting. For example, I might use a 75 grain point on a .600 spine arrow for target, and a 175 or 200 grain point on a .500 spine arrow of the same length for hunting.

Title: Re: Another spine question
Post by: snowplow on October 15, 2019, 09:46:07 AM

Thanks Dave.

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