another string question

[brent.westbrook]

The following is on a bob lee 60" 60# and I draw around 28.5"

I was using 18 strands of 452x and padding the loops with 6 b-55. That was shooting good with a 30" 400 with 50 grain insert and 200 grain head. Really good.

I built a string with 18 strands of 452x and did not pad the loops. Arrow speed went from 173-175 to 185-188fps and when I overdrew (29") it was 190. with a 640 grain arrow. Only with the new string I have to shoot at 30" 340 with 75grain insert and 150grain head.

I did not realize that much/little of difference would arise from the padding difference.

Has anyone else had similar issues? I like the speed gains but its hard for me to an arrow/foc combination that I like with the heads I would like to shoot. I would like to be able to shoot a 200 or 250 grain heads. Should I go back to my padded loops or try to tune a 300 spine arrow?
I really like the extra speed, because I was wanting to shoot some 2" 2 blades and I know that would help push the big heads through critters.

[Ol Man]

Yes Brent...this is common - I always let people know that there is a strong possibility that they will need to increase their spine on the arrows they shoot.

[brent.westbrook]

ok, I just didnt think the increase was goin to be this much.

[Ol Man]

Look at it this way... if you increase the size of your limb tips you lose inefficiencies = speed and cast. Increasing the mass on the string at limb tip has the same effect. This is the reason I do not recommend using b-50 or any dacron material to build loops up with.

[brent.westbrook]

ok.. got some 3-71/300 a/c/c'f flying good with a 250 grain head and 100 grain insert. Luckily I have acess to lots of arrows to choose from

[Ol Man]

good - more KE from that setup and you probably just dropped it back to the speed you were shooting before!

[brent.westbrook]

I did, about 3fps faster but with higher foc and now a 700 grain arrow

[Ol Man]

Can't kick at at that now!