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GRIP-N-RIP
06-24-2007, 07:16 AM
What Are The Parameters For Ibo Fps? Ibo Fps For My Cheetah Is 310. Actual Chrono Fps Is 266-270 Fps With A 398 Grain Arrow. I'm Just Wondering For Ibo Fps, What Grain Per Inch Arrows Are They Using? Thanks!

dbd870
06-24-2007, 08:23 AM
It's 70# draw weight, 30" draw 350gr arrow and every trick they can come up with. 270fps with a 398 gr arrow give you a KE of 64.4; sounds like a nice setup. Don't forget things like string silencers, nock sets etc. all rob a litte speed as well.

GRIP-N-RIP
06-24-2007, 09:20 AM
Thanks For The Info. I Just Have A Hard Time With The Fact Of Losing 40 Fps, With Silencers, A Peep And A D-loop.

hotrod26
06-24-2007, 11:12 AM
If you go to the site below they have a calculator and explain what takes away from your IBO speed.

http://www.thearcheryhut.com/index.htm

GRIP-N-RIP
06-24-2007, 04:48 PM
Thanks For The Help! Calculators Just Take The Fun Right Out Of It Dont They?

dbd870
06-24-2007, 05:16 PM
Very accurate. One almost need not bother with a chronograph!