Inch means a lot

tracker12 · July 29, 2015, 09:46:00 PM

I was bare shafting some new carbon arrows this evening and was unable to get them tuned with point and insert weight changes. They were still too weak and needed to be cut. I shortened it one inch and it mored the arrow a full 6" left. Next time I'll do 1/2 increments. I had no idea a cut of that length would make that much or a difference with a long bow.

CRS · July 29, 2015, 09:54:00 PM

I usually do 1/4" at a time with carbons.

July 29, 2015, 10:39:00 PM

Yep, even if I was waaaay off, I still would not cut more than 1/2" at a time off of carbon shafts!

Bisch

creekwood · July 29, 2015, 11:41:00 PM

My final cuts are 1/8 increments and that makes a difference that can be easily noticed.

tracker12 · July 30, 2015, 06:40:00 AM

I am going to put on my wraps and do a final tune before fletching them up. I'll be curious to see if the wraps change the impact much.

Jake Scott · July 30, 2015, 06:49:00 AM

I've never seen much of a difference adding wraps, but your mileage may vary. I made the same mistake a couple years ago, I cut a half inch off some carbons and went from weak to VERY stiff in a flash. Carbons respond to point weight changes, but not nearly as much as changing the length in my experience.

Jake

Kris · July 30, 2015, 09:58:00 AM

Thanks for the reminder...I was just going to cut and tune some bare shafts right now!

Troy Breeding cuts even finer increments, 1/16" I believe? Forgive me if I'm wrong :rolleyes:

Kris

LongbowArchitect · July 30, 2015, 10:09:00 AM

Carbons respond to point weight changes, but not nearly as much as changing the length in my experience.

x2

cacciatore · July 30, 2015, 11:26:00 AM

In my experience you'll need to add 100 grains in the point ti have the same spined 1" longer arrow

M60gunner · July 30, 2015, 01:08:00 PM

Wraps do not do much of anything to the shaft spine. I tried to spine up some shafts using wraps. No change noted. I ended up putting a nock inserts with weights to stiffen the shafts.
Just up your point weight weight to see what you need. Remove inserts and add weight to them with the GT weight system. That way you do not need to buy new broadheads.

tracker12 · July 30, 2015, 02:30:00 PM

Caciatore
You are pretty much right on with that. I was wanting to add 100 grains up front and that inch cut made it happen. I had heard before that 1/2 = 25 grains. I think it is more like 50 to a 1/2".

I'm going to cut another 1/4 off tonight to get them a little more to the left and compensate for fletching.

I'm then going to shoot my Big River #43 and #43 RER to see what the two bows spit out.

buckeye_hunter · July 31, 2015, 05:05:00 PM

Troy Breeding is an arrow expert! He even helped Dr. Ashby give a presentation at Kalamazoo a couple years ago.

I always cut just 1/4 inch at a time on carbons and when it gets close even less.

Killdeer · July 31, 2015, 05:44:00 PM

And they told me that size doesn't matter!

Killdeer~ . _ . That's an inch, according to the boyfriend that taught me to measure stuff.

Paul/KS · July 31, 2015, 05:55:00 PM

Oh Killdeer...

My too long a sailor brain is in a high speed wobble with comments unsaid right now. :rolleyes:

Killdeer · July 31, 2015, 06:18:00 PM

Fire up the gyros.

iohkus · July 31, 2015, 06:29:00 PM

Killdeer..... you're too much!! :D :D
Cacciatore ..... is that a "chiseled in stone" formula? .... as I like to keep notes in an Archery Notebook.
Will

legends1 · July 31, 2015, 10:17:00 PM

Amazing how much of a affect it is. I do a 1/4" at a time. You will find that better. Good luck.

Paul/KS · July 31, 2015, 10:46:00 PM

QuoteOriginally posted by Killdeer:
Fire up the gyros.

They are way out of calibration...

Morning Star · August 02, 2015, 06:34:00 PM

In my experiences, no more than 1/4" at a cut and the thicker reflective cap wraps will change spine.