Center-cut and Arrows question

[mlsthmpsn]

So, I'm getting closer to finishing a heavier bow and will need some new arrows for it.

In checking on some spine calculations....and I got to thinking about this bow already being cut to center (+1/8" with the rest) and the calculator likes me using 340 spine arrows, which are a lot heavier and calculated to be a bit slower....versus cutting it less than center (say 5/16" or 3/16") and the calculators like using some 500 or 400 spine arrows that may be a bit lighter, but fly a fair bit faster.


Too many options and weight inserts, and crap to even begin to mess with unless you have $1000 to buy a bit of everything!


So what are your thoughts on this? Where do you cut your windows too? And how much faith do you put into Stu's or 3Rivers spine calculators?

Thanks,

[Bvas]

Sometimes the calculators are good sometimes not. 

I like using the 3river calculator to get close with different shafts. I play around with whatever shafts I have on hand to get good flight. Usually by changing tip weight. Then once I have good flight I put that arrow specs into the calculator and record that number. Then I choose the shaft and point weight I want to use in the calculator and adjust the arrow length until I get back to the same number. This will get you pretty close. The only thing that throws this off is shafts of different diameter because it will change your center shot.

Hope that made sense. Lol

[mlsthmpsn]

The problem I'm running into is at 1/8" out, 340 spines calculate to be all 650ish grain total to match dynamic spines. Then the 400 spines are down to 450ish total to match on the calculators.

I just want 200-250gr up front and total around 550-600gr...calcuations can't seem to get me there.

[Bvas]

My guess is that you would need to go with a longer 400 shaft and use an aluminum footing to stiffen it back up.

This is where I have issues with the calculator. Adding 1-2” of footing should weaken the shaft, not stiffen it. The footing would not stiffen the shaft until it exceeds the length of the insert. 

[Bvas]

Option B would be to use a thinner strike plate to get a shorter 340, or build it out to use a longer 400.

[mlsthmpsn]

OK, thanks for the tips. I haven't messed with many different arrows, so there might be some that will work. I was thinking the 400 was WHT I'd need to begin with, and was surprised the 340 seemed more likely at first monkeying.

I was putting in the Gold Tip Traditional Classic XT and similar because I like the footing thing they come with... But have to have that 80gr insert and that throws everything off.

I've only ever shot Black Eagle Outlaws, so I don't have much experience to rely on for making decisions.