IBO Speed Calculations

[scooter]

I am getting a Hoyt Supertec here in the next little while and I was wondering what formula I would use to calculate the IBO speed of this bow based on my draw length of 26 1/2 inches?

Any idea?

[cdn-redneck]

Try www.bowjackson.com they have speed and KE calculators on their site. I know there is a rough formula for IBO calculations on a shorter than 30" draw length. I just can't remember what it is or where I seen it. :bash:

[RodS]

Warden, If you give me the draw weight and your exact arrow specs. with that draw length. I can run it through the archery program tonight when I get home and tell you how fast she'll shoot. I need to know the brand of arrow, fletching length, point weight and arrow shaft length. We just got a SuperTec in the shop yesterday and I had it at home playing with it this morning. Nice bow to be sure your gonna love it.

[scooter]

I have that software as well...The Archery Program is the best out there that I have found....

I was hoping to get a rough # with out having to measure my arrow specs.....Oh well...I will look on Bow jackson and see if I can find something.

Thanks guys.

[RodS]

Warden, Maybe I'm not tracking with ya right, but I punched in a 70lb. SuperTec at 26.5" draw length shooting a 27" 350 grain arrow. And TAP spit out 270 fps. Is that what you were looking for?

[scooter]

Ok, IBO speeds are based on arrows weighing 350 grains and a 30 inch draw at 70 lbs. So roughly..you loose 10 feet per second per inch of draw length.

So, given that....The IBO speed on the Supertec is 330 fps.

So, if I remove 10 fps per inch of draw.....My IBO speed on the Supertec at 70 lbs would be : 295 fps or there abouts.

[WOOKIE]

Yeah, but the kids bows you shoot usually max out at 40 lbs. :D

[cdn-redneck]

I thought that I just didn't post it :D Yeah, but the kids bows you shoot usually max out at 40 lbs.

[dnegard]

Scott
Dont let the other kids pick on you
pretty soon you can shoot a full size bow

[scooter]

Scott
Dont let the other kids pick on you
pretty soon you can shoot a full size bow
:moon: :moon: :moon: :moon: :moon: :moon: :moon: TO YOU ALL!! :lol: :lol: :lol: :lol: I will grow up and when I do <grin>....There's gonna be hell to pay.... :wink: :wink:

Heh....Hey Doug...Are you still heading up to Water Valley tomorrow?

[apapro]

Hey Warden:

We have two Supertech around here and I have set up both of them.

One is a 28" draw and the other a 29". The IBO speeds that we are getting with them is 323 fps @ 28" and 329 fps @ 29".

Ask and I will tell you some of the secrets to improving the speed on the Supertech.

I figure that with a 26.5 " draw and 350 gr. arrows (or 5 gr/lb of draw weight , 200 gr for 40lbs) you should be able to crack to 300 fps barrier!!!!!

[petew]

Don't forget that the rated speed of 330 is with nothing on the string!!Rarely do we see a bow dressed out to shoot , meet the IBO advertised speeds.Then discount the loss for the shorter draw length, noc's. silencers,peep and arow weight over 350 Grains.
I don't think there is an "IBO speed" for your setup.
IBO rates are for 70# 30"draw 350 grain arrow.It's just an even playing field for manufacturers to all use the same formula.Often the manufacturers have been known to stretch the truth by having a longer draw length than what the module or settings indicate . Some 30" modules are actualy giving a 31" draw length.just to help sales a bit.