Help me re-tune?

[Rusty Snuffers]

I swapped the 125 for a 100 on the bare shaft and noticed another slight change for the better.  I took the point completely out leaving just the 100g insert and the darn nock was looking right at me.  Can the string make enough of a change in the way the bow shoots that I have to drop 100g+ on the front of the arrow?
   :confused:    

[Blkbird]

On a curve or a hot hybrid they will..not so much on a longer d style longbow

[Rusty Snuffers]

And now the nock broke off of my test arrow.    

Think it's time to cut the grass or something and try later.

[Night Wing]

Are you shooting carbon arrows?

[Rusty Snuffers]

Yes sir.  GT Traditional 3555s with 100gr inserts and 125s up front.  Before switching to the SBD, the stock 16 strand was spitting them like darts with either field point or broadhead.  Now I'm thinking this string is just too fast for these arrows.

[BRITTMAN]

Rusty you will need to raise you brace height not lower it to stiffen you spine a bit . It shortens you prower stroke a little and makes your arrows a little stiffer and a little slower but you get a more quiet bow . Now , with bows wit very hight brace heights like my BW PSAX you would lower it to pull your arrow to the left but thats due more to the design of the bow than the normal brace height adjustments of other bows or so BW says .

[Bill Carlsen]

Sounds like you tried to fix something that wasn't broken...or thought that there wouldn't be a significant change. I have learned something from your thread....the weight of the string makes a difference. Remember, straight arrow flight trumps any other modification or equipment variable you might want to play with. If I were you and found that changing the string ruined my shooting accuracy I would have to go back to what was working for me.... speaking for myself, at least. There's nothing wrong trying something new, but if it doesn't work then why wouldn't you go back to where you were? Good luck with your tuning. Maybe you will find a solution but at least you know your old way worked pretty good.

[ishoot4thrills]

Originally posted by BRITTMAN:
Rusty you will need to raise you brace height not lower it to stiffen you spine a bit.............

I beg to differ with you on this, BRITTMAN. I'll have to agree with Stu Miller on this: "If the arrow is slightly weak for what the bow needs, then lower the brace height". So you need to LOWER the brace height to stiffen the spine.

[Rusty Snuffers]

Originally posted by Bill Carlsen:
Sounds like you tried to fix something that wasn't broken...or thought that there wouldn't be a significant change. I have learned something from your thread....the weight of the string makes a difference. Remember, straight arrow flight trumps any other modification or equipment variable you might want to play with. If I were you and found that changing the string ruined my shooting accuracy I would have to go back to what was working for me.... speaking for myself, at least. There's nothing wrong trying something new, but if it doesn't work then why wouldn't you go back to where you were? Good luck with your tuning. Maybe you will find a solution but at least you know your old way worked pretty good.

I was trying not to admit defeat here, Bill.  But I think the SBD will just have to wait for my next 60" bow.  It's quiet as can be, fast as lightning but it just doesn't like this bow/arrow combination.  I'll be putting the 16-strand back on tomorrow and should be shooting straight once again.  The stock string was quiet once I added a couple silencers and some yarn at the loops and the bow is fast enough methinks.  I do notice the arrows getting to the target faster with the SBD but they're just not hitting where I'm looking when I put the broadheads on.

Thanks again to all that responded.  I've learned a good bit in the last couple days.

Rusty

[xtrema312]

It is funny how many times I have seen the subject on brace height debated here with no concessions.  I think a pole post would be fun.

Ok I am going to throw something out here that will sound real odd, but I think I have seen this more than once in my own experience.  When you get a carbon arrow too far off on the weak side and the arrow a lot longer than needed with higher FOC I think you get a whipping action that can cause a false tune condition.  Carbon reacts so fast I think this is possible when the heavy point hanging out there flexes back.  I think this offsets the weak planning action.  Make a small change and it shows up.  It is the only thing I can think of to explain what I have seen and why some shoot arrows many others would consider way under spined.  Cut past center recurves are also more tolerant of spine so you could have been on a real boarder line spine and now you see that.  Also remember that the sting change could be compounded if you have way less in silencers on it.  You could have made a 7-9# change in spine requirements.  That would take a whole 1” off the shaft to start to make that up.

You’re shooting an arrow with a dynamic spine under 50# out of what I think is a cut past center recurve pulling at least 50# at your draw length.  I am not all that surprised you are a little under spined.  Keep playing with that side plate.  You may also want to pick-up a 400 spine shaft to play with for that new string.

[Looper]

Take out that 100 grain insert and put in a 50 grain. See where that puts you.  I wouldn't go any lower on brace height.

[Rusty Snuffers]

Switched back to the stock string and I'm slinging bullets again.  I think I'll hunt it with this setup and look into stiffer arrows next year with the SBD.

Then again, maybe I'll have an excuse to get another 60" bow.  (shh... don't tell the boss!)

Thanks again for all the help folks.