IBO speeds!!
11-06-2008, 11:16 AM
#23
Nontypical Buck
Join Date: Nov 2006
Location: Where the ducks don't come no more
Posts: 4,420
RE: IBO speeds!!
ORIGINAL: LAbushman
I have to ask a question about IBO speeds also. SInce they are based on
70# Draw Weight, 30# Draw Length, and 350grain arrow weight then how do they rate a Bowtech Equalizer?
The bow specs are as follows:
Draw lengths 24" - 27.5"
Draw Weight 29# - 60#
IBO Speed 300 - 308 IBO Speed
I have one at 26.5", #60#, and about a 400 grain arrow weight.
I have to ask a question about IBO speeds also. SInce they are based on
70# Draw Weight, 30# Draw Length, and 350grain arrow weight then how do they rate a Bowtech Equalizer?
The bow specs are as follows:
Draw lengths 24" - 27.5"
Draw Weight 29# - 60#
IBO Speed 300 - 308 IBO Speed
I have one at 26.5", #60#, and about a 400 grain arrow weight.
As to how they do it... lots of times you will see and asterrik next to the speed.... usually it will say "approximate", which means they figured it the same way I figured mine in my post on page 2. They'll take a 5gpp arrow for whatever weight... shoot it... take the speed.. at 10-12 fps for every inch they are under 30" and whallah!
Other companies will have the asterik, and they will tell you what specs they tested with... often times it will be the max draw length on a short draw bow.. with the max # and a 5gpp arrow.
No matter how you slice it.... its going to be slower when you actually set it all up... unless you have a 33" draw length like Arthur does. Then you can probably hit IBO speeds at 55#s with a 400gr arrow.
11-06-2008, 12:35 PM
#24
Nontypical Buck
Join Date: Mar 2008
Location: Henderson, KY
Posts: 1,760
RE: IBO speeds!!
Ibo for my 101st 60# 29.5"draw=330-340IBO
Hunting-400ishgr. arrow=290fps
Target-308gr.=5.01gpp=320fps.
thats about twenty under IBO. add a .5" of draw, take all of the string junk off and it would be around 330 or so. that would be IBO basically give or take 10fps.
Derek
Hunting-400ishgr. arrow=290fps
Target-308gr.=5.01gpp=320fps.
thats about twenty under IBO. add a .5" of draw, take all of the string junk off and it would be around 330 or so. that would be IBO basically give or take 10fps.
Derek
