I was trying to help Josh the other night....here' s his first post with my reply: Should help to iron things out.......
Josh:
Heres my setup.
57 Lbs Hoyt Havoc with versacam (2001)
28" draw length
65% letoff
365 grain arrow
only 1 brass nock on the string.
Drop away rest.
Matt:
I' ll take a quick shot Josh....but with those Hoyts ya never know, it just might be right.
I think the Havoc versa only had an IBO speed rating of around 300 to start with (maybe 298ish? or was it 305?)
Anyway the way I see it........Drop 20fps for draw length = 278fps
Drop another 5-7fps for a 50-60# model= 272fps
At 57# you are 80grs OVER IBO legal whcih will probably mean a loss of 30-40fps (1fps for every 2 or 2.5grs?) I' ll call it 35fps loss = 237fps
Brass nock another 2-3fps
= about 235fps total with your 365gr arrow.
Josh if you are saying now that your draw length is actually 30" you can jump that speed up close to 260fps. You did say that you just chrono' d it and got close to my first estimate tho at 238fps?
My guess for that set-up is:
28" Draw= 235-240 fps
29" Draw= 245-250 fps
30" Draw = 255-260 fps
(I' ll err a little on the hide side simply because I' m not sure exactly what that bow' s IBO rating really is, but I know it' s not a burner)
If you can figure out your draw length for sure this might give you a better idea of what that bow should be shooting.
If your draw length is 30" then that should change all of your numbers for the better.