Weird Arrow Issues

[gudspelr]

I'm shooting a 63# R/D laminated longbow at 28.5" draw.  I noticed some black coloring on the right side of the shelf cut out (r.h.'d shooter) last week and figured it's paint transfer from my arrows since I was shooting into a painted cardboard target.  I assumed this was from the archer's paradox-when the arrow bent around, it rubbed and left some paint on the shelf?

I'm shooting 5575's 30" long.  100 grain brass inserts, 145 grain fielt points.  5" helical parabolic feathers (3 of them).

Just got some new strings-had been using my buddy's old one-B50.  The new ones are B55 flemish and just tried one out.  Got the brace height a bit higher (where I think it should be, anyway) at about 7 3/16th.  1st arrow out cut my index finger and left about a 1/4" of fletching stuck in it (cock feather up, feather to the left was the one that got me).  Didn't feel the arrow come off the shelf, so thought it was odd.  Also, feather on the right separated from the arrow at the front end of it.

Tried again a few minutes later and didn't get my finger which was nice.  But the right fletch was again pulling off of the arrow at the front point.

Am I correct in thinking the higher brace height than used before (6 3/4" or so) is making the problem of a bit too weak spined arrows worse?  Are the arrows too weak, wrapping around the sight window, and forcing the front of the fletch off?

Thanks for any help...

Jeremy

[jimmerc]

I would guess that yor arrow are way too under spined from the start! i shoot a 57Lb longbow and use 5570 at 30" but had to go with alum incerts instead of brass and 150 heads! If I remember right I think the alum incerts were around 14 gn! (I draw at 28") I had to cut down a couple to 28 3/4 and used 100 gr brass with 150 heads and they tuned great for this bow so i will cut the rest down asap! I tune my arrow by shooting feild tips and broad heads! Hope this helps!

[jimmerc]

      This tHing double posted On me!

[Cherokee Scout]

fletch should have a dab of glue on point/front of fletch.

[James Wrenn]

The arrow sounds too weak for that bow to me.Now way I could shoot that setup from even a 50lb bow cut that long with all that brass up front.jmo

[metsastaja]

over spined according to Stu Dynamic calculator.
try Using a 100g field tip and see if makes a difference. That will make arrow 62.1 and your bow rates about 62.8 using 1/8 center cut

if you want to try calculator here is link
 Stu miller dynamic spine calculator  

Check string nock fit since new string
check side/shelf plate

[gudspelr]

Thanks for the advice.

Cherokee Scout-these were my 1st attempt at fletching and I did put glue at the tips to hopefully help.

I shot these arrows 150 or so times, but again-it was with the much lower brace height.  Didn't have any problems with the fletching then...

I cut the inserts down to about 50 grains which Stu's calculator says should be right about there for me.  I only had 6 arrows fletched up and now all of them are messed up...

Question-should I try bareshaft testing to make sure I'm good before I spend the time/money to re-fletch them?  How far away from target should I do it?  I was about 5 or 6 steps away w/ the new weight (still messed up the right feather) and the nocks on the arrows were up and left.

Suggestions...?  Thanks for the help


Jeremy

[James on laptop]

You need to be at least 20yds to bareshaft for best results.Farther is better if you have room.Too close really does nothing for checking spine.Things show up much better farther out.jmo

[gudspelr]

Thanks James-will try and give it a whirl.

[Bjorn]

The difference between 15 and 25 yards for bareshafting is night and day, nothing shows up at 15 and at 20 the Aha's start.

[eric-thor]

where is you knock set at?

[gudspelr]

eric-thor:

Don't have it set yet on the new strings...my buddy has a bow square that we're going to use.  Figured that could easily be why the nock ends were high, but not necessarily left...?

Also, at what distance from the target should "straight" be achieved?  Because of archers paradox, is there an average distance the arrow must fly before stabilizing and ending in "sraight" flight, thus going into the target straight?  Is it normal at close range to have a properly tuned arrow pointing one way or the other?

Thanks

Jeremy

[eric-thor]

i achieved strait and high and i knock at 5/8 inch. with hitting about 4inches rt at20 yrds "underspined" they flew perfect with feathers and blades. different shafts recover at different times wood is suposed ti be the fastest then aluminum and carbon is slowest at least that seem to be the concensus. one thing i know is good form and release is far more important than paradox timing.it just makes everything work better. and youll never get accurat testing of anykind ifyour form and release are crap.... gl

[gudspelr]

and youll never get accurat testing of anykind ifyour form and release are crap....  

Well, guess that about says it right there    .  Another guy pointed out that my feathers getting torn off might be from improper nocking point.  I'm wondering if that might have something to do with this, too since I don't have it set properly yet at all...

Thanks for the advice-will certainly try some of this out hopefully in the next few days.

Jeremy

[Don Stokes]

Your fletching should not get torn off because of spine problems. You have a glue adhesion problem. You might have a spine or tuning problem too, but that should not affect your fletching.

B55 is a low-stretch string, so you should not raise your fistmele unless the new string is heavier than the old B50 was. For most folks, going to a lower-stretch string allows lowering the fistmele.

[Joshua Lee]

Hey Jeremy,
I like the glue scenario that Don said. I was wondering if when you shot, do you hear the arrow hitting off the shelf?  If it ever stops raining, I would be happy to help you tinker. I have a target set up in the backyard and a dog that will pull the arrows out of the target for us (just kidding, but wouldn't that be cool).  I  even have a few arrows for you to try that should match your spine.  Let me know, I live over near pierce park and State st.
Josh

[gudspelr]

Thanks Josh-maybe I'll hit you up this weekend.


Jeremy