Stu Calculator

[brent.westbrook]

Didnt want to go to far off on the other thread. So here we are.

If my setup if way off from here what are some reasons for that. My setup from 2 yrs ago works perfect. (difference of .2lbs) But since then I have had to add more weight up front and and inch longer arrow. I thought that was from my release getting better. If it is getting better why am I getting further away from this calculation? Dont get me wrong, Im just curious. Im in no way changing my current setup, Today after I again added more weigh up front(310 total now) I had my first two arrows touching at 30 yards in the heart of my glendel buck. And at 15 yards again touching and then a broadhead getting way too close for comfort(Dont want to break a purdy arrow) All in all, Im just stumped on this calculator and was wondering if someone could educate me.

[TxAg]

From the reading I did, I don't think it does a good (accurate) job with arrows with a high FOC.

That seems to be the discrepancies that I usually see.

[brent.westbrook]

well I guess my 21-23 whatever it came out to puts me in that category then

[RickBarbee]

If everything is measured from, and also executed from center, the amount of FOC will not effect the accuracy of the calculator.

The calculator is based on everything being measured from center "zero", but it cannot compensate for the human factor where the person holding the bow is shifting from the zero point. That is where the personal form factor comes into play.

Lets say for example you have a bow that's center shot measures 1/8" inside center.
That measurement calculation could very well change dramatically simply due to how you
are holding the bow.

Rick

[brent.westbrook]

That measurement calculation could very well change dramatically simply due to how you
are holding the bow.

Rick

Does this mean my form is "bad" or just that it wont work with the calculator?

[RickBarbee]

Does this mean my form is "bad" or just that it wont work with the calculator?

Neither.

It just means you need to figure out your personal form factor, and apply it when using the calculator.

Using the way a person grips the bow again as an example:

The size of people's hands can/will make a lot of folks grip the same bow very differently, thus the from "zero" calculation won't work, because zero is different for many folks.

What you need to do is figure out how much you need added, or subtracted from the center shot calculation in order to make the calculator work accurately for you.

I know what I am trying to say, but I don't know if I am getting the point across. I hope so.

Rick

[Mike Javi Cooper]

I have to use -15 personal form factor to get mine to match up.. but once it does the program gets very close on other combos.

[Night Wing]

I don't look at the Form Factor until my arrows are flying perfect and the field points and broadhead tipped arrows are hitting impacting on the target where I'm looking.

I've got two Blacktail recurves and they both shoot the same 421 grain 2212 aluminum arrow. The 42# bow, the Form Factor is at (0). But, the 37# bow's Form Factor is (+9).

[brent.westbrook]

[QUOTE=Night Wing;4584486]I don't look at the Form Factor until my arrows are flying perfect and the field points and broadhead tipped arrows are hitting impacting on the target where I'm looking.

QUOTE]

Sounds to me like you only use the calculator to prove what you already know

[agtex42]

Sounds to me like you only use the calculator to prove what you already know

That's pretty much how it's been for me in the past, none of my "calculations" have been anyway close what actually works with any of my bows. It does get you closer than the Easton charts, but you've still gotta fine tune your tip weight and brace height to get things where you want them to be.

[brent.westbrook]

ok, so I decided to try it before I made any further decisions. I got it to arrow dynamic spine 52.8 and bow inputs at 52.7 with a human factor of -15 and holy crap!15yard groups look like they came from a compound!