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Main Boards => PowWow => Topic started by: mobiltoy on June 05, 2007, 07:45:00 PM

Title: ? on if I can weaken arrow spine
Post by: mobiltoy on June 05, 2007, 07:45:00 PM

I have some laminated shafts that are a little too stiff at the lengths I need.  Can I renock them with the grain on the verticle to weaken the spine and still have a safe arrow?  Thanks, Bill

Title: Re: ? on if I can weaken arrow spine
Post by: Pete Patterson on June 05, 2007, 07:54:00 PM

I have done that for years to "dial them in" to a particular spine within the overall range when purchased.  It works and I've never had a problem.

Title: Re: ? on if I can weaken arrow spine
Post by: mobiltoy on June 06, 2007, 07:06:00 AM

Thanks, Pete

Title: Re: ? on if I can weaken arrow spine
Post by: Danny Rowan on June 06, 2007, 07:13:00 AM

You can always go up in point weight to weaken the spine.

Danny

Title: Re: ? on if I can weaken arrow spine
Post by: Pat B on June 06, 2007, 12:25:00 PM

Or leave them long. For every inch over 28" you will reduce the spine weight by 5#.   Pat

Title: Re: ? on if I can weaken arrow spine
Post by: vermonster13 on June 06, 2007, 12:28:00 PM

Actually it should be every inch over 26 since they are woodies and most likely spined traditionally.

Title: Re: ? on if I can weaken arrow spine
Post by: mobiltoy on June 06, 2007, 02:20:00 PM

Thanks,  I have gone up to 160 gr point weight and have settled at 29 inches.  This gets me shooting ok I just was wanting dial these in better and be able to use some of these shafts with another bow that is close in weight.  Bill

Title: Re: ? on if I can weaken arrow spine
Post by: Kingstaken on June 06, 2007, 02:53:00 PM

Heavier tip is best.
Personally I would stay away from dialing in. No need to have an arrow explode.
Place the nock as it is intended to be properly  installed. I know there laminated, but bad practice is bad practice.

Title: Re: ? on if I can weaken arrow spine
Post by: Pat B on June 06, 2007, 03:13:00 PM

David, Isn't a 28" arrow the standard but measured between 26" uprights?    Pat

Title: Re: ? on if I can weaken arrow spine
Post by: Kanuck on June 06, 2007, 03:30:00 PM

What about tapering?  Won't that trim the spine back a bit and give a more FOC balance without drastically increasing point weight?  I've been told that 25gr increase in point weight over 125gr decreases the spine 5#.  Does that sound about right?

Title: Re: ? on if I can weaken arrow spine
Post by: vermonster13 on June 06, 2007, 03:35:00 PM

After World War II with the release of aluminum alloys back to the civilian market, Doug Easton’s aluminum alloy arrows slowly took over the market. For some reason, probably having to do with the length of arrow shafting, the standard span used became 28-inches with a shaft length of plus 1-inch to allow for axial traveling during deflection.