New string change tuning?

[Jarrod Reno]

This is the first time I've changed type of string from what came on a bow.... Just got in an SBD to replace what's on my toelke chinook, only reason really is because I wanted a custom color string    anyhow, set at the same brace height seems to change the tune... Went from 7 3/4" to 8 1/4" to get a quiet shot and least bit of vibration. Does that seem normal? Not strings have the same size cat whiskers. 58# @ 28". I'm pulling 30.5". 640gr arrow.

Both strings are fast flight. Toelke's was endless loop and SBD is Flemish. Any thoughts?

[slowbowjoe]

I think it's fairly common that a different string, with different material, will need some re-tuning.

[katman]

Yep, different string materials may require a re-tune. Other thoughts are is nock fit the same and did the dynamic spine change?

[Jarrod Reno]

Nick fit is the same and yes, seems like the dynamic spine has changed. I've got to take some feathers off an arrow to see how they fly bare now but def seems to be a difference.

[LBR]

Not uncommon at all.  Changing strings can affect several small things and you will need to fine-tune.  Shouldn't be anything drastic unless there was a huge difference in the strings.

[picapica]

A Flemish string has the full number of strands wrapping around the limbtip, whereas only half the strands in an endless loop do. I suspect that could easily make a difference in the way some bows perform.

[Jarrod Reno]

Yeah seems like 1/2" change in Brace height is pretty significant. Also, interesting thing happening... When it's at the same brace height (original brace height), the SBD smacks my forearm wheras the other doesn't.

[Jarrod Reno]

Could the SBD be moving that much harder to have more over travel?

[damascusdave]

How does the nock fit compare with the two strings...slapping the arm is often about a too tight nock fit dragging the string further before it releases the arrow

DDave

[Yolla Bolly]

I had to go to a stiffer arrow when I switched to an SBD 8 strand.

[tzolk]

Jarrod, how old is your Chinook? Not long ago the Toelkes started using 8 strand 450 I believe on their endless loop strings. I bet your SBD string will have a little more give if you are coming from a newer Toelke string. I use SBD as well. Great strings! I like the new Toelke strings but prefer the longer serving on the SBD.

[Jarrod Reno]

Hey, it's brand spankin new    just got it maybe a month ago.

[tzolk]

OK. Myself Having both of those same strings, the SBD will stretch more. Your tune may be a little different.

[LBR]

Difference in loop weight is minimal, even with a padded loop.  Flemish has more strands, endless is served.  Not going to be enough to make a noticeable difference.

1/2" in brace height is significant, and will usually affect tuning.

The string isn't going to move "harder".  The draw weight is what it is--the string won't affect that one way or the other.

A tighter nock fit would make a difference.

More than likely it's the difference in materials.  

Materials with Vectran (450+, 452X, BCY-X) have much less elasticity than 100% Dyneema materials (Dynaflight '10/Force 10, Dynaflight '97, 8125G, 8190).  

More elasticity will allow the string to travel forward more, especially with lower strand counts.

That is why you can generally get away with a lower brace height when using high performance materials vs. Dacron/polyester.  Polyester has a lot of elasticity.

[Stump73]

Number of strands has alot to do with it also.

[A.S.]

One other thing that will effect your tuning is the amount/type of silencer material that you have on your string. Yarn puffs tend to make my arrows tune stiffer than whiskers. Going from one to the other can make a big difference.  It all depends on how much of each material you use though.