ORIGINAL: TerryM
quote:
Just a question, is the IBO speed on the Equalizer based on 60# at 26.5" and a 350 grain arrow? I would presume that it would be, but wasn't sure.
Zac,
No, since the Equalizer model only comes in a peak weight of 60# in order to maintain the IBO standard of 5grs/lb of draw weight the speed reflects a 300gr arrow.
5 X 60 = 300
5 X 70 = 350
Matt,
Sorry for all the questions but I'm getting excited here. Getting back to the
equalizer, are you saying that those bows are producing those quoted speeds at 26.5" DL or are they estimates of what a 30" 70 lb bow can do ? I guess that makes no sense ( IBO specs ) since it does not go past 60 lbs or 26.5" DL. I'm guessing those figures would be actual BC speeds for a 26.5" DL 60 lb model ?
Terry, since I think I've finally got it figured out, let me take a stab at it. The equalizer is rated at 26.5" draw and 60# draw weight, but the arrow weight is reduced to 300 grains since the bow is a 60# bow. If I figure it correctly, as compared to the Allegiance:
Equalizer = 302 fps @ 60# and 26.5" draw w/ 300 gr. arrow
the same setup with the allegiance would yield approx. 300 fps
thats taking the ibo rating of 335, subtracting approx 10 fps per inch of draw takes it down to 300 fps at 26.5". Then reduce that speed by 17.5 (1.75fps/lb) more fps due to the decrease in poundage (70# down to 60#) your at 282.5 fps. Add back in the 17 fps to account for the reduction in arrow weight (ie. 350-300= 50), and you come up with 299.5 fps.
No where near scientific, but it should be pretty close.