ok thinking of trying carbons again

[handirifle]

#3734

Got some more carbons, on sale at Dick’s. $25 for 6. My kind of price. They are 400’s. To refresh, I shoot a 55# recurve with 27″ draw. My heads are 200gr Grizz’s with 100gr steel adapter. I have some steel inserts to use if necessary, that usually run about 135gr.

So not being a fan of super long arrows, about where do you think I will end up, length wise, with the 400 shafts?

Should I start with the steel inserts and go with them? I have 300 gr field points to tune with.

I am thinking this because even though I get excellent flight with the 2018 alums, I would like the tougher and thinner carbon

[handirifle]

#25354

OK edited my first post for typo’s. Sorry about that, I entered it with my phone and sometimes the display doesn’t let me scroll the screen so I cannot see what I typed.

Well today I gave it another shot. I am not really sure what I did different, but now I have excellent flight, with the slight exception of nock high still, which was my nemesis in the first attempt. I did reduce it considerably this time, but it’s still there to the tune of about 1-2″ at 15yds, bare shaft.

One thing I did NOT try, because I just now thought of it, was to play with the brace height. Maybe in a few days I will give that a shot. But I do know that can affect the spine tuning of the bow as well.

Overall I am VERY happy with todays outcome. I can get better groups at 25yds with these new arrows than I was getting with the older low FOC setups before at 20yds.

The arrows are as follows. Length is 27 15/16″, total weight is 680gr with my 290gr field points (my Grizz’s weigh 309gr with adapters, so that will up total hunting weight to 699gr) and 130gr steel inserts. I did my measurements and calculated (as close as possible) the FOC as slightly over 30%. I am a happy camper.

Now if I can figure out the nock high issue, I am THINKING it might flatten the trajectory just a tad, am I right on that assumption? Seems if the arrow wants to kick tail high, even slightly, that it might be forcing the nose down prematurely. At least that’s my theory. Am not sure how much dampening effect the feathers have on the tail kick. The fletched arrows seem to enter pretty level.

Now my brother in law has some yard killing pigs, so if I can just get a shot at one.:D I want to purposely hit the hard shoulder gristle for testing purposes.

They are mostly night visitors but once in a while they come just before sunset. I would like to try to get one with my recurve and the heavy FOC arrows, and also get one with my 60lb Mathews compound and standard FOC (12% I believe) and compare penetration. I am using Magnus 2 blade stingers with the Mathews. They do have the Tanto tip, so it ought to be a pretty fair comparison.

If I can get this done, I will post the details of the arrows of both.

[James Harvey]

#25391

Handi,

It’s my peanut understanding of the world that vertical nock position is only effected by nock height on a bare shaft. You may expect some degree of horizontal nock deviation coinciding with a brace height change as you will change how much force is delivered to the shaft. That peanut understanding lines up with my peanut experience as well.

I think J. Wesbrock had a good suggestion for nock height tuning where you start deliberately high (I think he suggested 1/4″) and work your way down till you get what you want.

I’m sure folks will jump on and correct me if I’m wrong 😀

Jim

EDIT:

My brain just worked a little better. If your brace height changes, so does your nock height a little. That could affect a deviation in vertical nock position.

[handirifle]

#25587

Well I was wondering, hoping maybe. I have adjusted the vertical about 3/4″ from top to bottom, and the 2″ deviation I mentioned is the best it gets.

This winter I may work on the bow riser to reduce the amount of contact the arrow makes with the shelf. I have tried the toothpick under the pad method, but it doesn’t seem to be doing much. I have done this to risers before I have been happy with the results. But for now I don’t want to mess up what I have.

[James Harvey]

#25810

Lucky for you there are plenty of wiser heads than mine kicking around here. Just about all of my nock related wisdom was imparted in my first post, someone who knows what they’re on about will be with you shortly I’m sure 😀

[handirifle]

#26081

Well based on the replies on other threads, they agree with you. So the only other idea I can come up with is radiusing the shelf to see what, if any, effect that might have.

[David Coulter]

#36513

See if you can ring up Troy on this issue. He was a great help for me when I went high FOC. dwc

[handirifle]

#36547

dwcphoto wrote: See if you can ring up Troy on this issue. He was a great help for me when I went high FOC. dwc

Thanks, I forgot to update this thread. I figured it out. It was hitting the “rug” rest on the shelf. The mat on the rest was fairly thick. I have since changed it and get very good bare shaft flight now.

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