Yeah, I'm the guy BTH has been talkin' smack (though nicely worded) about.
A bit of advice needed:
Here's the deal, despite my bow saying 49# @ 28", it drew 45ish on a scale at about 29.5" (my draw length). I say ...ish because I don't trust the method behind our measurement, but it confirms a few things which I'll spare y'all the details of here.
Now, I'm shootin' carbon express 4560's, full length, weighted like heck at the nose. Using a familiar web based FOC calculator, my lighter built arrow roughly 566 grains (roughly because I have a gram scale, and I convert using 15.43 grains/gram), comes in at 20.4% FOC using field tips and an overall arrow length of 34".
Using broadheads, the same weight arrow, now measuring 35.75" reads an FOC of 14.6%
Increased weight on second arrow, all at the nose (now roughly 645 grains), and FOC's come in at 20.5% for field tip (shorter overall arrow) and 17.4% for broadhead (longer).
Here's the question
thanks for stikin' with me thusfar
... Will I increase FOC by shortening the arrow (decrease of 9.9 grains per inch) perhaps down to an ideal length...
And, second question, is there an "ideal" length? Also, if at 20' range, increase in weight didn't seem to change trajectory or impact, should shortening by an inch or two also not necessarily change impact(due to a change in spine?)
Thanks guys, and Toby, do you know of an good therapist? Note the time of this post? I SHOULD BE ASLEEP!!!