Go Back  HuntingNet.com Forums > Archery Forums > Bowhunting
 Calculate my fps w/o chrono >

Calculate my fps w/o chrono

Bowhunting Talk about the passion that is bowhunting. Share in the stories, pictures, tips, tactics and learn how to be a better bowhunter.

Calculate my fps w/o chrono

Old 02-24-2008, 07:37 PM
  #1  
Thread Starter
 
Join Date: Dec 2006
Posts: 518
Default Calculate my fps w/o chrono

I have an 08 Diamond Black Ice and the birth cert states 298 fps with a 350 grain arrow at 70# and 29 inch dl.

My arrows should be in the neighborhood of 365 grains at 65# and a 28 inch dl.

How fast should it be shooting then? I'm going to get it through a chrono eventually but it would be nice to anticipate probably what it will be shooting.

Thanks
M77man is offline  
Old 02-24-2008, 07:44 PM
  #2  
 
Bols's Avatar
 
Join Date: Dec 2005
Location: IL
Posts: 1,269
Default RE: Calculate my fps w/o chrono

Others might have a better guess, I am saying around 270-275 fps. I know for sure, you are going to loose approximately 10 fps just on the 1inch difference in drawlength.




Bols is offline  
Old 02-24-2008, 07:58 PM
  #3  
 
Join Date: Jan 2008
Location: Wisconsin
Posts: 106
Default RE: Calculate my fps w/o chrono

For every inch of draw length you go down you will lose 10 FPS

For every 5# draw weight you go down you will lose 10 FPS

For every 3 grains of weight your arrow is over IBO you will lose 1 FPS

For every 3 grains of weight you add to your string you will lose 1 FPS.

So I would guess about 273 on the head. It could shoot a little slower it seems like they always do.
sluedtke is offline  
Old 02-24-2008, 08:19 PM
  #4  
Thread Starter
 
Join Date: Dec 2006
Posts: 518
Default RE: Calculate my fps w/o chrono

Thank you for the info, we'll go with that. Not like it really matters for a hunting bow on out to no more then 40 yards right? But just wanted to know.


M77man is offline  
Old 02-24-2008, 08:26 PM
  #5  
 
Join Date: Jan 2008
Location: Wisconsin
Posts: 106
Default RE: Calculate my fps w/o chrono

A heavier arrow helps out in down range shots like 30 yards and more because of kinetic energy, but it will be slower because of the weight.
sluedtke is offline  
Old 02-24-2008, 08:28 PM
  #6  
Nontypical Buck
 
buckmaster's Avatar
 
Join Date: Jul 2007
Location: Virginia
Posts: 3,882
Default RE: Calculate my fps w/o chrono

heres a pretty neat little calculator.

http://www.thearcheryhut.com/calculators.php
buckmaster is offline  
Old 02-24-2008, 08:37 PM
  #7  
 
Join Date: Jan 2008
Location: Wisconsin
Posts: 106
Default RE: Calculate my fps w/o chrono

LOL i just gave that calculator to somebody else on another thread... thats what I used for this info too.. found out the fps calc is a little bit off so rely on the words on the left and your own calculator for the fps...
sluedtke is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
whatisup02
Technical
5
09-15-2008 09:15 PM
crawdad375
Technical
4
11-14-2007 10:57 AM
Hunter4life81
Guns
10
08-02-2005 09:50 PM
nate121080
Technical
3
06-01-2003 05:31 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


Quick Reply: Calculate my fps w/o chrono


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.