How important is dynamic spine when choosing an arrow?

[rhendrix]

So I've been playing around with the arrow calculator on 3rivers and the arrows I'm currently shooting are matched up pretty closely in spine and bare shaft fairly well. Was just curious what would happen if I used an arrow that's significantly stiffer than what is recommended in the calculator? What kind of tuning problems am I going to run into? Is it necessary to have my arrow spine and dynamic spine matched? Is bare shaft tuning more important than matching spine?

Thanks,
Ron

[caughtandhobble]

Getting your proper spine will come through tuning, whether it is bare shaft, paper or broadhead tuning.

Shooting a stiff spine will never allow you to be as accurate you can be, or even group if it is really stiff.

The calculator is a great starting point.

Good Luck!!!

[Bisch]

There is only tuned, and not tuned. If you have a setup that is tuned well, and switch to a different shaft of a different spine, you will not get as good performance. Flight and penetration will not be as good with an out of tune arrow as with a tuned arrow. Also, mistakes by the shooter will be magnified on shots with the untuned arrow.

FWIW, the calculator is a tool to help a guy out. It is not correct every time for every shooter. That is why it has a Personal Form Factor (PFF). With the PFF, you can take an arrow that you know is right thru personal tuning (either paper tuning or bareshaft tuning) and make it match the bow you are shooting it out of.

Bisch

[rhendrix]

So if you do use an arrow that's stiffer, can you tune that arrow anyways? Or is it futile and a waste of time?

[Bisch]

So if you do use an arrow that's stiffer, can you tune that arrow anyways? Or is it futile and a waste of time?

You can tune different spine arrows to the same bow, within reason. You can change shaft length and front end weight (point/insert) to accomplish this.

On my current goto Sarrels Blueridge longbow, I have a set of .500 spine, and a set of .400 spine arrows that are tuned for it (both Easton Axis FMJ shafts). The .400's are several inces longer, and have more front end weight.

Bisch

[Junkers88]

So if you do use an arrow that's stiffer, can you tune that arrow anyways? Or is it futile and a waste of time?

You can tune a stiffer arrow with more weight up front or a softer arrow with less weight up front. You can tune pretty much anything.


That calculator is a great place to start.

[rhendrix]

You can tune different spine arrows to the same bow, within reason. You can change shaft length and front end weight (point/insert) to accomplish this.

On my current goto Sarrels Blueridge longbow, I have a set of .500 spine, and a set of .400 spine arrows that are tuned for it (both Easton Axis FMJ shafts). The .400's are several inces longer, and have more front end weight.

Bisch

Thanks, that's what I needed to know after manipulating the calculator it's crazy how much you've gotta add up front to make a 340 spine work similar to a 400 or 500.

[Bisch]

How important is dynamic spine when choosing an arrow?

.340's are pretty darn stiff. It's pretty hard to get that to work unless you are over at least 55# in draw weight.

Bisch

[rhendrix]

I'm at 50# and I have a boatload of .340 axis that I'm not using right now. Best laid plans I suppose.