Steve Graf wrote: How much left?

I’m a little confused by your description of spine. The arrows are gold tips right? Gold Tip measures their spine by poundage range like 55-75. Beaman measures their spine in inches of deflection like .500. Are they beaman’s or gold tips?

My gut tells me a 700+ grain arrow just won’t do well out of a 40 lb bow no matter what you do. Mostly because the bow will take so long to relax, giving you a lot of time after release to adversely affect the arrow’s flight. Just a guess.

Thanks very much for your input, Steve.

They are Gold Tip 3555 Expedition Hunters. According to the Gold Tip web site the followings specs are listed.
3555 Black 7.4gpi .500″ spine 30″ length

Ed Zachary wrote:
You don’t mention your draw length, I’m assuming it’s around 29″, with a 30″ BOP?

Thanks for your help Ed.

My draw length for a compound bow was determined to be 29 inches. Ed I do not know what BOP is.

I appreciate your ideas I will try them this afternoon.

My poundage is 40 lbs. I took the bow to my pro shop and they put it on the scale at 29 inches. I was reading 2008 Ashby study update report. He has a GT ultra 3555 arrow with 415 tip wt which tuned correctly. I am going to set up my arrows the same. I have 30″ BOP. I think he said he has 27 ” BOP arrows. I’ll let you know how it goes. I am trying to produce a ultra FOC arrows.

Thanks for your help

Tom.

Thanks Sapcut

I wonder if the gpi is the key. The GT expedition hunters I am trying to use are 7.4 gpi I understand the spine is the same. I will go check my bow wt again at the pro shop. I know my Predator II 20/40 .600 arrows with a 145 field tip bare shafted slightly weak. But I put on 5″ feathers and they flew great. Now that is 420 up front with your wife’s arrows.

Sapcut did you bare shaft tune them?

Thanks Sapcut. I just was rereading the bare shaft tuning article on the ACS site. It says ignore what the bareshafts look like in flight. Just see how they group with the arrows with feathers. Maybe that’s my problem I was looking at the arrow kicking nock left in flight. Bare in mind I shoot lefty. I will follow the instructions. If your spouses arrows work and the ones Dr. Asby work with about 415-420 up front I should be fine.

Thanks I will keep everyone posted.

I did set up arrows with 430 tip wt. They flew straight after I took off my beaver balls string silencers and the rubber mushrooms. They flew straight most of the time accept when I did not have good form and release. Then they acted stiff spine. Because I am a beginner the fact that Sapcut and his better half 😀 already did the work for me, was a big help. When my form becomes more consistent I will be able to fine tune my set up.

I feel we should have threads set up for each bow wt with info on what arrow set up works for each as a general starting point. So if you have a 50# bow filling in a form on the thread with all the necessary info for the experienced archers on this site would be very helpful and we can then easily monitor how someones set up worked when they make a kill. This may be a good way to increase the data that Dr. ED needs. Just my two cents as a newbie.

Indian Archery Recurve 1965 40# at my DL.

Gold Tip Expedition Hunters 3555
7.4 gpi
657 gr. overall wt.
30 7/16 inch arrows from nock groove to cut carbon
125 gr. Insert (15 grain insert plus 110 gr PDP wts.)
300 grain field point
31.93 % FOC

When I have good form they fly straight bare shafted from 15 yards. 😀
For hunting just need to use 100 gr brass inserts, 125 gr BH adapter and a 200 grain BH to have the same FOC and WT.
:D:D:D:D:D

Thanks Katman and Sapcut. I still need to buy my broadheads and adapters. I will keep you informed. I really appreciate everyones help.

Tom

FYI
I took three 300 gr field tips and wrapped masking tape around them until they weighed 325 gr each. Then used them with the 100 gr brass inserts. They were still too stiff but I adjusted my brace ht down and this did the job. Brace ht is now 6 7/8 inches and arrow nock is 7/16 inches above center.

This allowed me to have the wt up front on the field tips. Yes I weighed the field tips after I shot. They still weight the same. I guess I waisted my money on the wpt weight system. :D. I am going to go with 200 gr grizzlies or Abowyer broad heads.

Found out what was happening that was preventing me from making this work.:oops:

The brace ht was way off. I had it set way too low which affected my arrow flight. I started with the brace ht at about 6 7/8 from string to deepest point of bow grip. I started by twisting the string three turns to increase the brace height. Then shooting four bare shaft arrows.

Gold Tip Expedition Hunters 3555, spine 0.500, 7.4 gpi, 30″ arrows with 100 gr brass inserts and 300 gr field points. No fletching, just bare shafts.

As I progressed the arrow flight improved until now at 7.5 in brace ht the arrows are no longer kicking left. They are starting to fly straight. As I continued to increase the brace ht some of the arrows started kicking nock right which for this lefty indicates a weak arrow. I had to stop the brace ht adjusting as I had to go to work. I am not completely stable with good form so I will have to take that into consideration. But I am really excited that I found out what I was doing wrong. Probably would have saved a lot of time if I had a good traditional coach.

I appreciate all the help I am getting from all of you and I hope this is helping other newbies by following my mistakes.:D

Tom

I am finished. My brace ht is 8 1/8 and arrow nock is 1/2 above level. It would have been easier if I had known the brace ht range of the bow. But they are flying straight now. I am set for sure. Thanks for all your help everyone.